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Performance assessment and improvement of district cooling system: A case study of enhancing energy efficiency of hospital buildings Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-03-13 Xi Bai, Weidong Ma, Junjie Huang, Caihua Liang, Xiaosong Zhang
In addressing the performance degradation issue of district cooling systems, although various evaluation methods exist, they either neglect design objectives or focus on independent equipment, overlooking the synergies between devices. Therefore, the study establishes a comprehensive performance assessment framework, encompassing efficiency, environmental impact, economic factors, and technological
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Energy, exergy and sustainability analyses of nanoparticles added to fuels to reduce carbon footprint Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-03-12 Battal Doğan, Salih Özer, Erdinç Vural, Ahmet Fatih Haciyusufoğlu
In this study, experimental and thermodynamic analyses were used to investigate the use of fuel blends created by adding cerium oxide (CeO) and aluminium oxide (AlO) nanoparticles to diesel/heavy fuel oil (HFO) fuel blends in a compression ignition engine. In the study, a single-cylinder compression ignition engine was tested at four different engine loads at a constant engine speed of 3000 rpm. The
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A new heat transfer correlation based on flow patterns for hydrocarbon refrigerants condensation flow Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-03-12 Xianshi Fang, Guodong Qiu, Qian Li, Jie Chen, Weihua Cai
To accurately predict heat transfer coefficients for hydrocarbon refrigerants condensation flow in heat exchangers is imperative for designing efficient systems. While various studies have proposed numerous correlations for predicting heat transfer coefficients, some of these correlations are based on fitted experimental data and are limited to predicting specific conditions. The prediction accuracy
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Investigation of free convection in a wavy trapezoidal porous cavity with MWCNT- Fe3O4/Water hybrid nanofluid under MHD effects: Galerkin finite element analysis Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-03-12 Kamel Guedri, Abdel-Nour Zaim, S. Mohammad Sajadi, Dheyaa J. Jasim, Abderrahmane Aissa, Soheil Salahshour, Ahmad Almuhtady, Obai Younis, Sh Baghaei, Wael Al-Kouz
Our study focuses on numerically investigating natural convection within a three-dimensional trapezoidal cavity featuring a corrugated hot bottom wall, with a particular emphasis on enhancing heat exchange using a water-based hybrid nanofluid. Employing a steady-state regime assumption, the study considers laminar and incompressible three-dimensional flow. The Darcy-Forchheimer model is incorporated
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Adaptive thermal error prediction for CNC machine tool spindle using online measurement and an improved recursive least square algorithm Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-03-12 Xinyuan Wei, Honghan Ye, Gao Wang, Weidong Hu
Establishing models for predicting and compensating for spindle thermal errors is cost-effective and necessary to improve the accuracy of machine tools for smart manufacturing. However, the prediction performance of existing methods deteriorates significantly with dynamic working conditions of machine tools because training from static conditions leads to the inability to adapt to dynamic conditions
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Novel entropy generation and optimization for hybrid nanofluid flow via ribbed surface parabolic trough collector Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-03-12 Priyanka, Sunil Kumar, Anil Kumar, Tabish Alam, Md Irfanul Haque Siddiqui, Dan Dobrotă
This research paper focuses on the optimization of parameters for deformative receiver tubes to achieve prime choice of design for efficient energy absorption. The motivation of the current study lies in addressing the critical need for optimizing parameters of deformative receiver tube to obtain optimal design to enhance energy absorption efficiency in Parabolic Trough Solar Collectors (PTSC). Considering
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Experimental investigation and gray relational optimization of engine parameters to improve the output characteristics of an ammonia biodiesel powered dual fuel combustion engine Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-03-12 R. Elumalai, S. Sumathy, Ravi K, Mohammad Nishat Akhtar, Elumalai P V, Sher Afghan Khan, M. Satyanarayana Gupta, Mohammad Asif
An innovative approach to this research is to evaluate the effects of different concentrations of biodiesel with premixed ammonia energy in a dual-fuel combustion engine and determine the best operating conditions for optimal engine responses. Experimental results of a 40% ammonia energy premixing fraction with direct injection of a biodiesel blend of 30% (40%AEPF + B30) at 80% load improved brake
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Effects of natural gas admission location and timing on performance and emissions characteristics of LPDF two-stroke engine at low load Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-03-11 Antony John Nyongesa, Jae-Hyuk Choi, Ji-Woong Lee, Jae-ung Lee, Seongwan Kim, Siljung Yeo, Jun-Soo Kim, Won-Ju Lee
Low-pressure gas-admission marine two-stroke engines have significant potential for reducing emissions in the shipping industry. However, they exhibit poor combustion quality under low-load conditions, leading to lower thermal efficiency and high levels of HC and CO emissions. This study numerically evaluated the impacts of the gas admission location and timing on engine performance and exhaust gas
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Thermal and mass exchange in a multiphase peristaltic flow with electric-debye-layer effects and chemical reactions using machine learning Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-03-11 Mohammad Alqudah, Arshad Riaz, Muhammad Naeem Aslam, Mehpara Shehzadi, Muhammad Waheed Aslam, Nadeem Shaukat, Ghaliah Alhamzi
The present investigation delves into the analysis of mass and thermal transmission during the peristalsis of a two phase flow of a Prandtl fluid, within a symmetric channel by considering entropy generation and minimization. The considered flow is examined by taking into account the impacts of electroosmotic effects through Electric Debye Layer (EDL) and chemical reactions followed by the lubrication
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Improving flow efficiency in micro and mini-channels with offset strip fins: A stacking ensemble technique for Accurate friction factor prediction in steady periodically developed flow Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-03-11 K. Chandan, K.V. Nagaraja, Fehmi Gamaoun, T.V. Smitha, N. Neelima, Umair Khan, Ahmed M Hassan
A novel machine-learning model for micro and mini-channel friction factor prediction is presented in this article. In recent years, periodic array offset strip fins in micro and mini channels have gained attention due to their compactness and aid in heat transfer in chemical processing and electronic cooling devices. The research uses fin length-to-height ratios below one, and Reynolds numbers between
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Theoretical and numerical study on ceiling temperature distribution of fire in the SRRT with curvature considering train blocking Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-03-11 Daiqiang Zhu, Pai Xu, Liangjie Zhou, Zhengpan Hu, Rongjun Xing, Linjie Li
The slopping rack railway tunnel (SRRT) with curvature is applied to pass through mountainous areas due to the terrain. And the temperature distribution under train blocking in the SRRT with curvature is significantly different when a fire occurs, posing a great threat to personnel safety. The train blocking and two curvature types of -shaped and -shaped are considered, and the mathematical expressions
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Double-diffusive mixed convection in an inclined square cavity filled with nanofluid: A numerical study with external magnetic field and heated square blockage effects Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-03-11 N.R. Devi, M. Gnanasekaran, A. Satheesh, P.R. Kanna, J. Taler, D.S. Kumar, D. Taler, T. Sobota
This study explores the influence of FeO – Water nanofluid, magnetic forces, and double-diffusive mixed convection characteristics on a steady-state, two-dimensional, laminar flow within an inclined square cavity containing four heated square blockages. The governing equations are solved using the Finite Volume Method (FVM). In this configuration, the temperature and concentration inside the square
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Investigation of the effect of model structure type on the thermal performance of phase change materials through molecular dynamics simulation Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-03-11 Walid Aich, Ali Basem, Abbas J. Sultan, Amer Ali Ghabra, Aboulbaba Eladeb, Lioua Kolsi, Soheil Salahshour, Sh. Baghaei
Using molecular dynamics (MD) simulation, the thermal efficacy of phase change materials (PCMs) in solar energy applications and solar thermal energy storage was evaluated. In order to achieve this objective, an investigation was conducted into the structure's temperature (Temp), velocity, and density profiles, heat flux, thermal conductivity, charge and discharge time, and thermal stability. Three
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Thermal characteristics of MHD [formula omitted] water nanofluids flow past a stretching/shrinking wedge in the view of Cattaneo-Christov heat flux Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-03-11 Sohail Rehman, Marrium Shamshad, Samia Nasr, Sherzod Abdullaev
Wedge flow has a variety of potential uses, including thermal systems, geothermal power plants, aerodynamics and cooling of nuclear power plants. In this framework, the modified Cattaneo-Christov heat flux is implemented to examine the thermal characteristics in the dissipative flow of a viscous nanoliquid over a shrinking/stretching wedge. The laminar and two-dimensional flow of water over a wedge
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Assessment of a sustainable multigeneration system integrating supercritical CO2 Brayton cycle and LNG regasification: Thermodynamic and exergoeconomic evaluation Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-03-10 Mohamed S. Yousef, A.A. Hawwash, Domingo Santana
This study proposes a cost-effective multigeneration system that integrates a supercritical carbon dioxide (sCO) power cycle with a liquefied natural gas (LNG) regasification process. The system aims to deliver electricity, cooling, heating, and hydrogen simultaneously. Utilizing the temperature difference between the sCO cycle and the LNG thermal sink, an ammonia-water-based absorption refrigeration
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Marine temperature and humidity regulation combined system: Performance analysis and multi-objective optimization Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-03-09 Zhe Wang, Menglong Cao, Haobo Tang, Bo Dong, Yulong Ji, Fenghui Han
The efficient and environmentally friendly air conditioning system plays a vital role in cost reduction and efficiency improvement within the shipping industry. This study focuses on a specific ocean-going container ship equipped with the 8S90ME-C10.2 marine diesel engine as its main propulsion system. Firstly, the cooling load of 149.56 kW and a wet load of 18.04 g/s for the container ship were calculated
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A new stacking model method to solve an inverse flow and heat coupling problem for aero-engine turbine blades Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-03-09 Lu Qin, Depu Lu, Haoran Zheng, Chengen Wang, Wei Dong
The whole temperature distribution of a turbine blade is an important information for heat transfer design for turbine, but it is very difficult and expensive to measure the whole temperature filed, especially for the internal points of a blade. It is necessary to reconstruct the whole temperature distribution by calculating reversely unknown parameters based on sparse temperature values on the blade
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Multi-dimensional flow simulation analysis and kriging-based optimization study on thermodynamic process mechanism of pulse tube refrigerator with displacer Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-03-08 Yilin Wang, Yu Yan, Rui Wang, Zhuoqun Cao, Zheng Cui, Chen Zheng
Pulse tube refrigerators with active displacers have become increasingly popular due to superior phase shift capability and avoidance of dissipation losses. However, mechanisms of thermodynamic processes within refrigerators due to variations in parameters related to critical structures and operations are not yet clear, making it difficult to optimize the comprehensive performance. In this paper, multi-dimensional
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Conjugate gradient method with regularization in estimating mold surface heat flux during continuous casting Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-03-07 Ce Liang, Wanlin Wang, Zichao Wang, Haihui Zhang
The reconstruction of the boundary heat flux between solidifying steel and water-cooled mold wall using measured temperature data is recognized as an inverse heat conduction problem (IHCP). A Tikhonov spatial regularization approach to enhance the smoothness of the onjugate radient ethod () was proposed which incorporates three different orders of spatial regularization: zeroth, first, and second order
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Influence of fracture parameters on hydraulic shear seepage characteristics of granite Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-03-07 Jupeng Tang, Honghao Yu, Zhihao Wei, Xiao Zhang
To reveal the influence mechanism of different fracture parameters on the permeability characteristics of hot dry rock after hydraulic shear. The self-made high temperature true triaxial hydraulic shear test device and rock roughness profile tester were used. The granite in Daqing area of Songliao Basin is taken as the research object. The prefabricated fractured granite is subjected to high-temperature
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The significance of radiative heat and mass transfer through a vertical sheet with chemical reaction: Designing by artificial approach Levenberg-Marquardt Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-03-07 J.G. AL-Juaid, Zeeshan Khan, Aatif Ali, Muhammad Bilal Riaz, Taseer Muhammad, Jana Shafi, Saeed Islam
The present study examines the impact of incorporating soft computing algorithms during neural network training on the evaluation and prediction performance of artificial neural networks. The research centers on a magneto hydrodynamic flow model (RHMT-VSCR) that depicts the movement of rotating fluid along a vertical sheet in a permeable medium. Furthermore, the model considers the impact of heat source-sink
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Assessment of re-entry survivability of aluminum oxide with different nanostructures considering surface catalytic heat-transfer Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-03-07 Seong-Hyeon Park, Yosheph Yang, Ikhyun Kim
Re-entry survivability analysis is generally performed with the assumption of a smooth surface, for which the effect of surface roughness can be ignored. In such an approach, analysis may not provide accurate estimation of the survivability analysis of the re-entry object. The material surface roughness is known to enhance the surface catalytic properties of the material and thus results in a higher
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Enhancing diesel engine cooling efficiency: A comprehensive numerical study on nanofluid coolants with exergy and economic analysis Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-03-06 Mahdi Hajiakbari, Alireza Mahdavi Nejad, Ehsan Houshfar
This research focuses on improving the efficiency of four-stroke diesel engines, widely used in land transport. The study looks at how using nanofluids and different coolant combinations can impact thermophysical properties, such as convective heat transfer coefficient, Nusselt number, and entropy values. The Mercedes-Benz OM502 v8 2023 engine is used in the study. The goal is to improve radiator cooling
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Research on explosion venting characteristics of CH4/H2/Air mixture in square explosion vessels Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-03-06 Wen Zhou, Jiefan Zhang, Xinfeng Li, Yue Zhao, Ting Zhang, Xueqiang Shi, Guoen Fu, Jianfu Xu, Xiaobo Shen, Weiguo Cao
Hydrogenation of methane (CH) is an important means of achieving energy savings and large-scale hydrogen (H) transportation. Explosion venting is considered to be an effective method to reduce the risk of gas explosions. To investigate the parameters of the explosion characteristics of CH/H/Air premixed fuel under venting conditions, the explosion characteristics and the dynamic propagation law of
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Three-heat-reservoir thermal Brownian heat pump and its performance limits Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-03-06 Lingen Chen, Congzheng Qi, Yanlin Ge, Huijun Feng
Three-heat-reservoir (THR) heat pump has the originality of using low-grade heat to achieve pumping heat, and it can recycle waste heat and reduce environmental pollution effectively. Based on the research ideas of macro THR heat pumps and micro three-terminal thermoelectric devices, this paper proposes a THR thermal Brownian heat pump cycle model. This cycle is driven by low-grade “heat” to work,
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Role of catalytic reactions in a flow-induced due to outer stationary and inner stretched coaxial cylinders: An application of Probabilists’ Hermite collocation method Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-03-06 Madhu J, Rania Saadeh, Karthik K, R.S. Varun Kumar, R. Naveen Kumar, R.J. Punith Gowda, Umair Khan, Amal Abdulrahman, M. Modather M. Abdou
This paper investigates the impact of homogeneous-heterogeneous chemical reactions on the flow between the coaxial cylinders with heat generation/absorption. From an engineering perspective, in energy absorber design for the shrinking and expanding of a circular metal tube in the production of extruding materials by stretching cylinders designing with great care is necessary to regulate skin friction
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Comprehensive optimization of an integrated energy system for power, hydrogen, and freshwater generation using high-temperature PEM fuel cell Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-03-06 Soheil Gharibzadeh, Roghayyeh Motallebzadeh, Samad Jafarmadar, Abdulsalam Ebrahimpour
Modern energy conversion technologies with low or no emissions are needed to achieve sustainable development goals. This research examines the thermodynamic and exergy-economic features of a high-temperature proton exchange membrane fuel cell. A cutting-edge, integrated energy system uses high-temperature proton exchange membrane fuel cells, an organic Rankine cycle, a proton exchange membrane electrolyzer
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Natural convection heat transfer of a hybrid nanofluid in a permeable quadrantal enclosure with heat generation Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-03-06 Muhammad Salim Khan, Shafee Ahmad, Zahir Shah, Narcisa Vrinceanu, Mansoor H. Alshehri
This study investigates the steady laminar natural convection phenomenon within a quadrantal enclosure occupied by a fluid-saturated porous medium. The enclosure undergoes internal heat generation and magnetohydrodynamic buoyancy-driven thermal energy transfer. The governing equations were nondimensionalized and resolved utilizing the FEM. The research examined the impacts of heat generation and the
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The heat transfer and entropy generation of fin and inclined flat tube heat exchanger Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-03-05 Luan Nguyen Thanh, Le Minh Nhut, An-Quoc Hoang
The present work determines the appropriate inclination angles for each flat tube aspect ratio to increase the thermohydraulic performance without extending the heat exchange area. Furthermore, the amount of entropy generation was investigated to evaluate the exergy destruction for device configuration. A numerical simulation was performed with an inlet air velocity in a range from 3.5 to 5.0 m/s,
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An inimitable Elman network based fire hawk controller and skill optimized power tracker with ultra gain converter for improving the performance of PV tied EV systems Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-03-05 Jaanaa Rubavathy S, Sungeetha D, Carmel Mary Belinda M J, Jayant Giri, Emad Makki, Hitesh Panchal, Gomathi S, Deepa P, Aravind Kumar J, Praveenkumar T R
The need for Electric Vehicles (EVs) has grown as a result of the issues brought on by fossil fuels. To keep up with the rising demand for electricity, the power source is equipped with additional renewable energy sources (RES). In order to meet the demand for energy, the solar photovoltaic (PV) system is deployed in this work. The novel contribution of this paper is the design and development of unique
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Influence of boundary conditions on non-equilibrium heat transport under ultrafast laser action based on the lattice Boltzmann method Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-03-05 Yudong Mao, Shouyu Liu, Jiying Liu, Mingzhi Yu, Xinwei Li, Kaimin Yang
Based on the lattice Boltzmann method, this paper simulated the non-equilibrium heat transfer process in nano-silicon thin film under ultrafast laser irradiation. The influence of boundary conditions on heat transport was investigated. Results show that under rebound and diffuse boundary conditions, the energy distribution within the film is non-uniform due to interface effects. However, the specular
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Numerical study of phase change material partitioned cavities coupled with fins for thermal management of photovoltaic cells Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-03-05 Yuxiang Hong, Yuan Shi, Dandan Bai, Feng Jiao, Juan Du
To enhance the temperature control capability of photovoltaic-phase change material systems, a strategy involving the combination of fins and partitioned cavities is employed to enhance the heat transfer process. Thermal performance of four cavity arrangements including a rectangular cavity, a partitioned rectangular cavity, a finned rectangular cavity, and a partitioned rectangular cavity with fins
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Effects of a conductive T-shaped partition on the phase change dynamics in a channel equipped with multiple encapsulated PCMs under different magnetic fields Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-03-04 Fatih Selimefendigil, Kaouther Ghachem, Hind Albalawi, Badr M. Alshammari, Taher Labidi, Lioua Kolsi
For enhanced thermal management and energy storage, an understanding of the phase change process and how to control it is crucial in many different engineering applications. In this study, effects of using a T-shaped conductive partition on the phase change process in a multiple phase change material-installed three dimensional cylinder are explored by using finite element method. In the computational
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Generalized fractional model of heat transfer in uncertain hybrid nanofluid with entropy optimization in fuzzy-Caputo sense Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-03-04 Mubashir Qayyum, Sidra Afzal, Efaza Ahmad, Ali Akgül, Sayed M. El Din
In this paper, we present a new fuzzy-fractional (FF) transformation to recover FF differential model of hybrid nanofluid. The current study focuses on FF modeling of nanofluid with engine oil as base fluid, while ferrous oxide and alumina are considered nanoparticles. In accordance to the real industrial phenomena, the flow is simulated between two squeezing plates with thermal radiation and magnetic
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Twisted helical Tape's impact on heat transfer and friction in zinc oxide (ZnO) nanofluids for solar water heaters: Biomedical insight Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-03-04 M. Arun, Debabrata Barik, Sreejesh S.R. Chandran, Nikhil Govil, Prabhakar Sharma, T.M. Yunus Khan, Rahmath Ulla Baig, Bhaskor Jyoti Bora, Bhaskar Jyoti Medhi, Raman Kumar, Achmad Rizal, Muhammad Imam Ammarullah
This study explores the influence of Zinc Oxide (ZnO) nanofluids on solar water heaters with Dimple Tubes and Helical Twisted Tape (DTHTT) surfaces. The helical twisted tape design enhances turbulence, improving nanofluid mixing and thermal exchange. Computational fluid dynamics (CFD) validates the efficiency of the parabolic trough solar water heater (PTSWH) with emphasis on solar light concentration
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A heat transfer correlation of Poiseuille-Rayleigh-Bénard convection in the thermal entrance region of a horizontal rectangular channel Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-03-03 Yu-Zhi Zhu, Yue Huang, Li Zhang, You-Rong Li
In order to understand heat transfer characteristics and obtain a heat transfer correlation of Poiseuille-Rayleigh-Bénard (P-R-B) convection in the thermal entrance region of a horizontal rectangular channel, we performed a series of the direct numerical simulations. The working fluid is water, and the spanwise aspect ratio of the rectangular channel ranges from 2 to 10. The results show that the thermal
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Numerical investigation of heat transfer enhancement in dielectric fluids through electro-thermo-capillary convection Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-03-03 Chedlia Mhedhbi, Mohamed Issam Elkhazen, Walid Hassen, Karim Kriaa, Chemseddine Maatki, Bilel Hadrich, Lioua Kolsi
In this study, a 2D numerical analysis was conducted to investigate electro-thermo-capillary convection in a 2D enclosure filled with a dielectric fluid. The enclosure had a free top surface and was subjected to buoyancy and electrical forces. The study considered a strong unipolar injection of electric charge (C = 10), a mobility number (M = 10), and a Prandtl number (Pr = 10). Calculations were performed
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Analysis of thermal density and heat sink on dissipative nanofluid along magnetized sheet and applications in microelectronic cooling systems Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-03-02 Ismail Boukholda, Zia Ullah, Y.M. Mahrous, Ahmed Alamer, Mouldi Ben Amara, M.D. Alsulami, Abdullah A. Faqihi, Nidhal Ben Khedher
The objective of present analysis is to control excessive thermal behavior in microelectronic devices using heat sink and magnetic field. Improving technological innovation demands proper temperature evacuation in microelectronic components. A feasible method for cooling microelectronics is to use nanofluid, a novel heat-transport liquid. To achieve significant cooling, microelectronic devices must
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Optimal design of heat pipes for city gate station heaters by applying genetic and Bayesian optimization algorithms to an artificial neural network model Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-03-02 Ghaem Taghipour Kani, Amirreza Ghahremani
This study contains a novel idea to improve the performance of city gate station heaters, using pulsating heat pipes with optimized structure. In this research, a hybrid method including Bayesian and genetic algorithms is implemented to optimize the architecture of an artificial neural network (ANN) model and find the optimal operating point for heat pipes. In the previous study, the authors have proposed
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Numerical analysis of the heat transfer and pressure drop of a wavy fin and Kammtail tube condenser: An investigative study Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-03-01 Funda Erdem Şahnali, Ş. Özgür Atayılmaz, Zafer Gemici
The aim of this study was to numerically investigate the factors affecting the air-side performance of an innovative condenser for a domestic refrigerator. Novel condenser with a smooth Kammtail tube form was investigated due to delaying flow separation. For the first time in the literature, the kammtail form was used instead of round or ellipse geometry in a finned tube heat exchanger, and the advantages
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Exploring the interactions of NH3 and H2O co-condensation: A study on the potential of supersonic separators for NH3–H2 separation Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-03-01 Jiang Bian, Ziyuan Zhao, Yang Liu, Zeyu Zhang, Xuewen Cao
The use of a supersonic separator presents a novel approach for separating ammonia (NH) from hydrogen (H). Even trace amounts of water (HO) can significantly influence the condensation characteristics of NH. This study presents mathematical models for homogeneous NH and HO condensation and heterogeneous NH–HO condensation. Through computational analysis, we revealed that the droplet radius and liquid
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Power characteristics of a high-performance helix traveling wave tube Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-03-01 Renu Sharma, Amitavo Roy Chaudhary, Ruchika Mehta, Raghbendra Singh Tomar, Dilber Uzun Ozsahin, Sameh Askar, Hijaz Ahmad
Traveling Wave Tubes (TWT) are most widely used in civil, defense, and space applications as power amplifiers over a wide range of frequency. When a TWT works at a higher bandwidth, it suffers from nonlinearities, which affects the overall performance of the tube and hence the required results aren't achieved. So, optimization of a TWT is required, mainly in terms of its power characteristics. Power
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Corrigendum to “Impact of surfactant on Al2O3/water nanofluids stability for cooling the central processing unit of computer” [Case Stud. Therm. Eng. 54 (2024) 104094] Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-02-29 Mohammed Ghazy Habbeb, Abdulelah Hameed Yaseen, A.M. Hussien
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The thermal response of the ignition and combustion of high-energy material projectiles under the influence of heat Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-02-29 Dihua Ou Yang, Chunwei Qin, Xiaowen Qin, Quanmin Xie, Xinzhe Nian
The thermal response of energetic materials involves processes of thermochemical mechanical coupling, which can lead to thermal damage in such materials both before and after ignition, thereby increasing ignition sensitivity and the level of danger. Many studies to date have either neglected or oversimplified the effects of thermal coupling, leading to significant discrepancies between simulated and
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Water-saving performance study of water conservation and plume abatement device in wet mechanical draft cooling towers Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-02-29 Weishu Wang, Long Li, Ming Gao, Mengyao Zhang, Qinghua Xu, Jie Wang
A water-saving cooling tower was proposed in the power plant to save water resources. In this paper, the multiphase flow model and the species transport model in FLUENT software are used to simulate the condensation process of wet air, and the performance of the water-saving device is studied. Comparing the experimental results with the simulation results, the relative error of the cooling tower outlet
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Thermal/econmic/environmental considerations in a multi-geneation layout with a heat recovery process; A multi-attitude optimization based on ANN approach Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-02-29 Gang Du, Haoran Wei, Pradeep Kumar Singh, Ashit Kumar Dutta, Barno Sayfutdinovna Abdullaeva, Yasser Fouad, Salem Alkhalaf, Ahmed Alkhayyat, Ahmed Deifalla
The proposed system is designed to address the growing demand for sustainable and efficient energy solutions that can minimize greenhouse gas emissions while meeting the increasing energy needs of a modern world. The integrated approach of the system allows it to produce not only electricity but also hydrogen and fresh water from seawater, making it a comprehensive solution to multiple challenges.
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Boundary layer and entropy analysis of non-Newtonian Casson nanofluids moving nonlinearly in a wedge-shaped stretching plate under an unsteady flow Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-02-29 Liang Zhang, Huimin Zhang, Shuangzhu Wang, Jiabai Song, Xinyue Yao, Wenjie Wang
In this paper, the boundary layer and entropy production characteristics of a Casson nanofluid moving nonlinearly in a wedge-shaped stretching plate under an unsteady flow are investigated. In the course of the study, the continuity, momentum, energy and concentration equations are changed into nonlinear ordinary differential equations by similarity transformation, and numerical solution methods are
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Case study of design and construction of dehydration for paddy by heat exchanger rectangular two-phase closed thermosyphon (DP-HE/RTPCT) Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-02-29 Sanhawat Thongdang, Surachet Sichamnan, Suriya Chokphoemphun, Amorn Donmuang, Namphon Pipatpaiboon
The purpose of this research was to design and produce a dehydration system for paddy using a heat exchanger rectangular two-phase closed thermosyphon (DP-HE/RTPCT), which is a modified version of the rectangular two-phase closed thermosyphon (RTPCT). The working fluids used in this study were R11 and methanol at 50% addition rate of the evaporator volume while evaporator temperatures of DP-HE/RTPCT
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Experimental study on the influence of different parameters of copper foam on the flame propagation characteristics and quenching ability of powder deflagration Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-02-29 Yansong Zhang, Hongtao Dong, Mengting Cao, Runzhi Li, Yingjun Sun, Xiao Liu, Yinghui Zhang
Foam metal as a promising application of explosion-proof and explosion-suppression materials, which itself has a complex three-dimensional pore structure, can be more effective in quenching gas and dust explosion flame in this research, a platform was created to experiment with dust deflagration using transparent quartz tubes and high-speed photography. The study focused on how copper foam affects
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Effect of using gasoline and gasoline-ethanol fuel mixture on performance and emissions in a hydrogen generator supported SI engine Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-02-29 Faruk Oral
The study presents a gasoline engine's performance and emissions results using ethanol and a hydrogen-oxygen mixture as supplementary fuels. The experiment was carried out utilizing a SI engine (single-cylinder), encompassing six different speeds (1500–4000 rpm). G100 (pure gasoline), G5E (volume 95% gasoline and 5% ethanol), and fuel blends obtained by adding H/O to these fuels were used in the experiment
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Investigating the effect of pH on the swelling process, mechanical and thermal attributes of polyacrylamide hydrogel structure: A molecular dynamics study Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-02-28 Zhiming Liu, Ali Basem, Loghman Mostafa, Dheyaa J. Jasim, Ameer H. Al-Rubaye, Soheil Salahshour, Maboud Hekmatifar, Shadi Esmaeili
Stimuli-responsive hydrogels are a class of hydrogels that undergo reversible changes in their physical or chemical properties in response to specific external stimuli. The pH is a critical environmental stimulus for stimuli-responsive hydrogels. When the pH of the surrounding environment changes, it can lead to significant alterations in the properties of the hydrogel, such as swelling behavior, mechanical
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Double diffusive on powell eyring fluid flow by mixed convection from an exponential stretching surface with variable viscosity/thermal conductivity Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-02-28 S. Karthik, D. Iranian, Hadil Alhazmi, Ilyas Khan, A. Singh, M. Ijaz Khan
This study delves into heat and mass transference in fluids with variable thermo-physical features, focusing on the Powell-Eyring fluid, a non-Newtonian substance with unique characteristics. Our aim is to understand the behaviour of this shear-thinning fluid when interacting with an exponentially stretchable surface, considering factors like mixed convection and thermal radiation. Our research endeavours
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Investigation on the combustion kinetics of non-caking coal under various ventilation rates Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-02-28 Qing-Wei Li, Hui-Pan Fan, Li-Feng Ren, Ye-Rui Zhu, Zi-Qi Lü, Shuai-Jing Ren
Ventilation provides the oxygen required for coal combustion, but it also accelerates the thermal loss of reaction system. To investigate the influence of ventilation on coal combustion, the characteristic temperatures and stage variation were analyzed. Furthermore, the kinetic mode was determined and the apparent activation energy was calculated. The results indicated that the increase of ventilation
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Ignition and combustion characteristics of micro/nano-Al and Al@Ni alloy powders at elevated pressures Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-02-28 Chaojie Feng, Xiao Jin, Zhangtao Wang, Xuefeng Huang, Shengji Li, Jiankan Zhang
Nanosizing and alloying of aluminum (Al) promisingly improve ignition and combustion performance of Al-based propellants. To aim this, lased-induced ignition and combustion characteristics of micro/nano-Al and aluminum@nickel (Al@Ni) alloy powders at elevated pressures (0.1–3.0 MPa) were investigated and the pressure effect on these characteristics was correspondingly evaluated. Comparative results
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Mechanical behavior of Tamusu mudstone under elevated temperatures Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-02-28 Hongdan Yu, Chen Lu, Weizhong Chen, Haifeng Lu, Jiawei Huang
Tamusu mudstone is a potential geological medium for high-level radioactive waste disposal in China. In this study, the mechanical behavior of Tamusu mudstone was examined through a series of triaxial compression experiments conducted under varying confining pressures (5, 10, 15, and 20 MPa) at two temperatures: 22 °C and 80 °C. The experimental findings revealed that heating strengthened the mechanical
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Chemical reaction, slip effects and non-linear thermal radiation on unsteady MHD Jeffreys nanofluid flow over a stretching sheet Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-02-28 M. Veera Krishna, A.G. Vijaya Kumar
“The boundary layer flow past the stretching surface by the velocity slip and the temperature jumping boundary situations is the imperative type of the flow and temperature transports happening in a number of engineering and industrial applications. Keeping in this mind, the magnetohydrodynamic (MHD) flow and temperature transport of the Jeffreys nanoliquid past a stretching sheet by the non-uniform
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Verification experiment of maximum hydraulic diameter in a novel three-dimensional asymmetric oscillating heat pipe Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-02-27 Lilin Chu, Jin Xu, Zheng Li, Xu Zhao
A novel three-dimensional asymmetric oscillating heat pipe (3DAOHP) with unequal curvature radius of upper and lower bends has been designed. Setting the basic factor of diameter from 1.9 mm to 6.2 mm, a verification experiment on the criterion of conventional maximum hydraulic diameter (MHD) has been conducted. The results show that the 3DAOHP can still perform normally and transfer heat effectively
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Molecular dynamics study on heterogeneous nucleation mechanism: Plausible nanobubble coalescence pathway Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-02-27 Yiyu Li, Yaming Fan, Minfeng Zheng, Lili Li, Sherman C.P. Cheung
The Bubble Nucleation process has been attracted research attention due to its wide practical applications. In literature, researchers commonly accepted vapour trapping in cervices on the heated substrate as the mechanism initialising the incipient of bubble nuclei. However, experimental observations found that the onset of nucleation could occur on ultra-smooth surfaces where vapour trapping is not
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Thermally radiative bioconvective nanofluid flow on a wavy cylinder with buongiorno model: A sensitivity analysis using response surface methodology Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-02-27 Muhammad Abdul Basit, Muhammad Imran, Rabia Safdar, Madeeha Tahir, Mohamed R. Ali, Ahmed S. Hendy, Abdullah Alhushaybari, Aiedh Mrisi Alharthi
The significant impact of nanotechnology has turned the ordinary into the excellent in the ever-changing environment of science and technology. Recent times have seen a dramatic transformation as advances in science and technology continue to push us into the domain of nanoscale innovation. Fluid flow over a range of geometries is involved in the physical processes of heat and mass transfer subject
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Exploring carbon dioxide generation in combustion of long-flame coal in Huating mining area by using ReaxFF MD Case Stud. Therm. Eng. (IF 6.8) Pub Date : 2024-02-27 Zhen-Guo Yan, Jun-Feng Zeng, Yang Xiao, Zhen-Ping Wang, Qing-Wei Li, Xing Lu
Coal combustion contributes to 44% of global fuel CO emissions. Until now, there has less effective means to study the generation mechanism of carbon dioxide. To approach the generation mechanism of CO in coal combustion process at atomic level, the structure information of long-flame coal from Huating mining area, Gansu, China was characterized by ultimate analysis, C NMR and XPS. According to these