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Design, optimisation and evaluation of the S-CO2 Brayton cycle for marine low-speed engine flue gas Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-18 Liangtao Xie, Jianguo Yang, Xin Yang, Zheng Qin, Sicong Sun
Five configurations of the S-CO2 Brayton cycle (SCBC) were constructed for flue gas waste heat recovery (WHR) of the marine low-speed engine HHM-6EX340EF on the EBSILON platform using the bench test data to save energy, reduce emissions and the efficient operation of ocean-going vessels. Experimental data from Sandia National Laboratories (SNL) was utilised to validate the accuracy of the model and
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Optimal dual-pressure evaporation organic Rankine cycle for recovering waste heat from compressed air energy storage (CAES) Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-18 Zhong Ge, Yanlei Zhai, Jian Li, Jianbin Xie, Zhiyong Xie, Fubin Yang
Compressed Air Energy Storage (CAES) is an effective solution to the problems of the intermittency and volatility of renewable energy. However, the process of compressing air consumes energy and converts it into low-temperature waste heat, limiting the improvement of round-trip efficiency. This paper introduces the dual-pressure evaporation organic Rankine cycle (ORC) to recover the waste heat from
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Experimental study on improving the heat transfer performance of large-diameter thin flattened heat pipes Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-18 Wenjie Zhou, Yetong Chen, Yong Li, Junfeng He, Yixiong Liu, Jixiang Gao, Yue Jian, Huazhuo Liang
Theoretically, when flattened to the same thickness, thin flattened heat pipes made from thin-walled cylindrical heat pipes with larger diameters have better thermal performance, but the conventional wick structures cannot meet their high-performance thermal requirements. In this study, to improve the heat transfer performance of large-diameter thin flattened heat pipes, composite sintered wick structures
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Rheological impact of viscous fluid in the core region of heated curved pipe surrounded by Casson rheological fluid Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-18 H. Shahzad, Z. Abbas, M.Y. Rafiq
The immiscible fluids can help design more efficient systems for drug delivery and understanding the blood flow through diseased arteries. It can also have implications for the design of flow control devices or medical implants that involve curved geometries. Therefore, the current article scrutinizes the characteristics of heat transfer on the flow of two immiscible Casson and Newtonian fluids through
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Heat transfer characterization of SCO2 in non-uniformly heated rectangular cooling tubes under large mass flow and heat flux conditions Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-17 Xiaojuan Niu, Yonghang Gu, Jingwen Fan, Guilei Yue, Heyong Si, Wenpeng Hong
A Thermoelectric Conversion System (TECS) with SCO2 as the circulating mass can effectively mitigate the fuel heat sink and electrical energy shortage problems of hypersonic vehicles. However, there is still a lack of research on the use of SCO2 in the harsh thermal conditions in scramjet. In this paper, the heat transfer mechanism of SCO2 in rectangular cooling tubes are numerically analyzed for the
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Hybrid of non-dominated sorting genetic algorithm II and invasive weed optimization for fan duct surface heat exchanger configuration optimization design Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-17 Zhe Xu, Zongling Yu, Xin Ning, Xiuying Wan, Zhipeng Qu, Changyin Zhao
In this research, configuration optimization was conducted for FDSHX (fan duct surface heat exchanger) that is a new type of heat exchanger adopted in aero-engine heat management in recent years. Firstly, a method of Taguchi-ANFIS (Taguchi-Adaptive Neuro-Fuzzy Inference System), which can reduce training data volume utilizing orthogonal experimental matrix, was proposed to construct a rapid response
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Numerical investigation of heat transfer characteristics of hydrogen flow in a randomly packed bed Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-16 Quanchen Zhang, Yongfang Xia, Zude Cheng, Xin Quan
In this study, two randomly packed beds with small tube-to-particle diameter (D/d) ratios of D/d = 4 (PB-4) and D/d = 5 (PB-5) are constructed using the discrete element method (DEM). The pore-scale heat transfer characteristics of hydrogen flow at low pore Reynolds numbers (Rep < 100) are investigated using a DEM-CFD simulation approach, with the temperature-dependent thermo-properties of hydrogen
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Investigations on thermal profiles and flow structures in a square channel equipped with staggered vortex turbulators Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-16 Amnart Boonloi, Nuttawut Lewpiriyawong, Withada Jedsadaratanachai
Given the escalating energy demands today, improving the efficiency of engineering equipment is crucial for optimizing energy use. This study focuses on enhancing heat exchanger performance through passive methods, particularly by installing vortex turbulators. Passive techniques can effectively manage energy costs while enhancing efficiency.
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Investigation on combustion instability of electronic fuel injected multi-cylinder radial piston engine through multifractal technique – A comparative analysis Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-16 Michal Jan Gęca, Łukasz Grabowski, Konrad Pietrykowski, Grzegorz Litak, Nanthagopal Kasianantham
The main objective of the present study was to investigate combustion instability in a multi-cylinder radial piston engine with electronic fuel injection to ensure safety and reliability, maintain fuel efficiency, reduce harmful emissions, which has a positive impact on the environment. Multi-fractal analysis showed that IMEP (mean effective pressure) fluctuations are an anti-persistent process, meaning
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Computational and intelligence modeling analysis of pharmaceutical freeze drying for prediction of temperature in the process Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-16 Mohammed Alqarni, Ali Abdullah Alqarni
Accurate temperature prediction is crucial for various scientific and engineering applications, yet it remains challenging due to the complex relationships between spatial coordinates and temperature variations. This study addresses this challenge by exploring advanced machine learning models to improve prediction accuracy, filling the research gap in optimizing predictive models for temperature estimation
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Effects of oscillation on convective thermal flow in a vertical enclosure filled by nanofluid particles Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-16 Afraz Hussain Majeed, Rashid Mahmood, Dong Liu, Yongchao Zhang, Jia Yin Zhang, Huan Yi Ren, Ahmed S. Hendy, Mohamed R. Ali
In this work, we numerically explore all possible ways to improve heat transmission in a sinusoidal cavity with oxide nanoparticle suspensions in liquid. Engineers aim to improve thermal efficiency in their designs by incorporating an inclined magnetic field into prospective flow configurations. One of the most important advances is the utilization of sinusoidal walls, which significantly improve thermal
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Experimental study on transverse fire source and blockage locations influence on tunnel fire temperature distribution Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-16 Linjie Li, Zhen Wang, Zhaoguo Wu, Huixian Huang, Haibing Zhang, Zihe Gao
Previous research has commonly assumed that tunnel fire blockage occurs at the central longitudinal axis of tunnels. However, fires may arise at different points within tunnels, each with various distances from the tunnel sidewall. The study aimed to investigate the distribution of ceiling temperature fields across various scenarios of blockage and transverse fire source locations by conducting a sequence
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Thermal behavior of ferrofluids in a microfin tube with rotating magnetic fields: Experimental analysis and artificial intelligence modeling strategies Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-16 Walid Aich, Somayeh Davoodabadi Farahani, Zarindokht Helforoush, Moustafa S. Darweesh, Lioua Kolsi
The utilization of various tools by researchers to enhance heat transfer (HT) in fluid flow is steadily on the rise. These tools encompass both active and passive methods. This study involved an experimental examination of HT and fluid flow within a micro-fin tube. The strategies were implemented to improve Nu: ferrofluid, micro-fins, and a rotating magnetic field. Before implementation, the magnetic
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Theoretical and numerical analyses of thermal stresses and temperature variations in disc cutter cutting composite strata under thermal-force multi-fields Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-16 Xiongfei Lyu, Youliang Chen, Shaoming Liao, Tomas Manuel Fernandez-Steeger
Composite strata consisting of hard and soft rock are common during shield cutter excavation. The friction cutting process generates a large amount of cutting heat, high temperature will produce thermal stresses and thermal expansion in the disc cutter ring, resulting in wear and deformation of the cutter, reducing its rock breaking performance. From the perspective of thermal-force change in cutter
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Prediction of airflow temperature in coal mining face under the influence of multiple heat sources coupling: Numerical simulation and verification Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-15 Mingyan Guo, Yueping Qin, Dezheng Wang, Shibin Wang, Fei Tang, Panpan Liu
With the development of coal resources to the deep, the mine heat damage has become increasingly serious. In this work, we proposed a comprehensive airflow temperature prediction model considering the coupling effect of multiple heat sources in coal mining face. The model was then discretized and a coupled solution simulator was developed independently. Finally, we conducted field test to verify the
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Effects of viscous and Joule dissipation on hydromagnetic hybrid nanofluid flow over nonlinear stretching surface with Hamilton-Crosser model Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-15 Izzat Razzaq, Wang Xinhua, Ghulam Rasool, Tao Sun, Thirupathi Thumma, Ch Achi Reddy, Kamil Abbas, Abdul Qadir Khan
Hybrid nanofluids are crucial for enhancing thermal management, efficiency, and longevity in industrial applications such as heat exchangers, automotive cooling, and advanced manufacturing. The current study primarily investigates the impact of viscous and Joule dissipation on copper-alumina hybrid nanofluid flow over a stretching surface, with a particular focus on magnetic field effects resulting
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Generalized thermoelastic interactions in functional graded materials under laser heat source with a timed pulse Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-15 Zuhur Alqahtani, Ibrahim Abbas
This work aims to find a solution to a problem involving generalized thermoelastic interaction in functionally graded materials when heated by a laser using a timed pulse. Functionally graded materials (FGM) are materials having spatially variable material characteristics. The governing formulations of a generalized thermoelastic theory with one relaxation time are established. The domain of the Laplace
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Study on thermal crack characteristics of granite in Shandong Province, China under different temperatures and heating/cooling treatments Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-14 Weiqiang Zhang, Zhanghao Shi, Xin Zhang, Yangzhou Wang, Yun Wu
The qualitative and quantitative analysis of crack initiation characteristics, extended procedure, and crack network morphology of rock under different temperatures and heating/cooling paths was conducted in order to delve deeper into the mechanism of thermal cracking, and the analytical perspectives mainly include microstructure, thermodynamics, and mineral crystal properties. Research results indicate
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Numerical and experimental study on the curing process of NEPE solid rocket propellant considering multi-physical field effects Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-14 Guoqing Chen, Tianlin Pan, Weiwei Hui, Guizu Zhang, Peng Cao, Jianru Wang
A multi-physical field numerical model considering the thermo-chemical and mechanical effects was used to simulate the curing process of a nitrate ester plasticized polyether (NEPE) solid propellant. The curing process of solid rocket propellants was detected through physical experiments such as differential scanning calorimetry (DSC) and heat transfer. The variation laws and distribution patterns
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Biomimetic fractal pillars for the thermal–hydraulic enhancement of a vapor chamber Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-14 Shuiping Zhu, Yong Li, Yi Chen
Owing to their remarkable thermal–hydraulic performance, vapor chambers have diverse applications, especially for cooling electronic devices. However, the performances of circular and noncircular pillars throughout the entire vapor chamber under identical wick volume conditions have been compared in very few studies. In this study, a series of noncircular pillar arrays featuring biomimetic tree-like
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Numerical simulation of interior ballistics two-phase flow in modular charge based on the particle element method Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-14 Shenshen Cheng, Ruyi Tao, Xinggan Lu, Xiaoting Cui, Hao Wang
The full combustibility and strong discontinuity characteristics of module charge result in significant differences from conventional mode, making it challenging for traditional two-fluid methods to effectively reveal its particle dispersion mechanism. In this study, the particle element method for module charge were developed and applied for modeling the interior ballistics to overcome above drawback
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Thermal analysis of metal foam and nanofluid integration in an asymmetrical heated channel Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-14 T.C. Shubha, Thaurya Naik, Banjara Kotresha, Shekasa L. Nadaf, N. Neelima, Taseer Muhammad, Chander Prakash
The flow and heat transport presentation of the nanofluid flowing through the metal foam (MF) positioned inside the asymmetrical heated horizontal channel is evaluated computationally in the current study. The MF of 20 pores per inch (PPI) with porosity 0.918 is inserted into horizontal channel test section. The test segment is heated from the top wall with the help of plate (aluminum) heater assemblage
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Effects of inlet air holes on swirl flow characteristics and outlet temperature distribution in an axial swirl combustor Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-14 Yanzhao An, Shicheng Shen, Xueqing Fu, Yuzhang Wang, Yiqiang Pei, Yan Zhang, Chuang Chen
The air inlet holes on the swirl combustor are crucial for high-performance micro gas turbine (MGT), affecting internal airflow, fuel-air mixing, temperature distribution, and cooling. However, there are seldom studies that pay attention to the influence of the air inlet holes coupled with low volatility macromolecular fuels for fast and better fuel-air mixing and combustion processes in MGT. This
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Transient modeling of stratified thermal storage tanks: Comparison of 1D models and the Advanced Flowrate Distribution method Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-14 Adrian Riebel, Ian Wolde, Rodrigo Escobar, Rodrigo Barraza, José M. Cardemil
Thermal energy storage (TES) is one of the key technologies for enabling a higher deployment of renewable energy. In this context, the present study analyzes the modeling strategies of one of the most common TES systems: stratified thermal storage tanks. These systems are essential to many solar thermal installations and heat pumps, among other clean energy technologies. Three different one-dimensional
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Machine learning based prognostics and statistical optimization of the performance of biogas-biodiesel blends powered engine Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-12 Prabhu Paramasivam, Mansoor Alruqi, Seshathiri Dhanasekaran, Fahad Albalawi, H.A. Hanafi, Waleed Saad
In this study, waste biomass-derived biogas was employed as the main fuel while the biodiesel-diesel blend was used as pilot fuel. This paper describes the development of a Decision Tree and Response Surface methodology-based statistical framework for prediction modeling and optimization. The compression ratio, fuel injection time, fuel injection pressure, and biogas flow rate were employed as controllable
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Thermal optimization of ivermectin in supercritical carbon dioxide and ethanol to produce nano medicine Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-12 Reem M. Gahtani, Umme Hani, Farhat Fatima, Tariq Nadeem, Riyaz Ali Osmani
The solubility of ivermectin in high pressure carbon dioxide (CO2) at 338, 328, 318, and 308 K temperatures was investigated with and without an ethanol. Several methods were employed to model the data obtained from the experiments. ivermectin exhibited solubility values ranging from 0.130 × 10−5 to 1.760 × 10−4 in the binary system and 1.880 × 10−5 to 1.237 × 10−4 in the ternary system. The outcome
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A novel case of honeycomb shaped pin fin heat sink: CFD-data driven machine learning models for thermal performance prediction Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-12 Kazi Masuk Elahi, Nabil Mohammad Chowdhury, Mohammad Rejaul Haque, Md Mamunur Rashid, Md Meraj Hossain, Tahmid Sadi
This research explores a useful thermal engineering application utilizing novel honeycomb-shaped pin fins heat sink (PFHS). 3D incompressible flow and heat transfer are examined using standard k-ԑ turbulence model for Reynolds numbers (Re) ranging from 8547 to 21367. Using the PFHS with 1.5 mm side length and pitch arrangement of (S =25 × 25), the Nusselt Number (Nu) increased by 171 % at a Re of 21367
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Enhancing pyramid solar still performance using suspended v-steps, reflectors, Peltier cooling, forced condensation, and thermal storing materials Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-12 Ali Alshamrani
This work aims at enhancing the thermal efficiency of pyramid distiller solar still (PDSS). A modified version (MPDSS) was developed, featuring suspended v-steps on the vertical walls of the distiller. Additionally, the MPDSS was equipped with external reflectors (MPDSS-R) designed to concentrate solar energy, thereby potentially increasing evaporation rates. To further boost the condensation rate
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Effect of MHD and radiation on biviscous Bingham fluid flow on Marangoni boundary for heat source/sink with chemical reaction Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-12 U.S. Mahabaleshwar, T. Maranna, G.M. Sachin, B. Buonomo, O. Manca
A significance of Marangoni-driven convective magnetohydrodynamics (MHD) was investigated in a planned study. The present study examines the impact of radiation and chemical reactions on the two dimensional boundary layer flow of bi-viscous Bingham fluid on a thermosolutal Marangoni boundary with magnetic field and heat source/sink. The physical flow problem is mathematically modelled into Navier–Stokes
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Study of two thermally integrated pumped thermal electricity storage systems using distinct working fluid groups: Performance comparison Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-12 Penglai Wang, Qibin Li, Shukun Wang
As a competitive new energy storage technology, the thermally integrated pumped thermal electricity storage (TI-PTES) system has received much attention. In this work, two TI-PTES systems are constructed: the RHP-BORC system, which consists of a heat pump cycle (HP) with a regenerator and a basic organic Rankine cycle (BORC), and the RHP-EOFC system, which consists of a HP with a regenerator and an
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Deep learning-enabled integration of renewable energy sources through photovoltaics in buildings Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-11 Munusamy Arun, Thanh Tuan Le, Debabrata Barik, Prabhakar Sharma, Sameh M. Osman, Van Kiet Huynh, Jerzy Kowalski, Van Huong Dong, Viet Vinh Le
Installing photovoltaic (PV) systems in buildings is one of the most effective strategies for achieving sustainable energy goals and reducing carbon emissions. However, the requirement for efficient energy management, the fluctuating energy demands, and the intermittent nature of solar power are a few of the obstacles to the seamless integration of PV systems into buildings. These complexities surpass
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Consequence of Cattaneo-Christov heat and mass flux models on bioconvective flow of dusty hybrid nanofluid over a Riga plate in the presence of gyrotactic microorganisms and Stephan blowing impacts Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-11 Munawar Abbas, Nargis Khan, M.S. Hashmi, Zabidin Salleh, Ayman A. Aly, Shahram Rezapour, Mustafa Inc
This study investigates the impact of the Stephan blowing and Cattaneo-Christov flux model on bioconvective flow of dusty hybrid nanofluid over a Riga plate in the presence of gyrotactic microorganisms and variable dust particles volume friction. Mass and heat phenomena are explored in the context of Stefan blowing impacts. The hybrid nanofluid consists of nanoparticles of MgO and Ag base fluid water
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Corrigendum to “Triple solutions for unsteady stagnation flow of tri-hybrid nanofluid with heat generation/absorption in a porous medium” [Case Studies in Thermal Engineering 61 (2024) 105027] Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-11 Yun Ouyang, Md Faisal Md Basir, Kohilavani Naganthran, Ioan Pop
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Distinguishing the vertical air-staging low-NOx function of secondary air for suspension combustion within an industrial-scale coal-fired reversal grate furnace Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-11 Shengchen Qi, Min Kuang, Zehao Ge, Wenhao Xie
The numerous coal-fired grate furnaces in China, which were designed to partition primary air on the grate and arrange secondary air in the freeboard for air-staging combustion, suffered from poor burnout and high NO. However, secondary air was conventionally closed or set at marginal openings in real operations and no investigation was reported to explain why. Upon these off-design secondary-air circumstances
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Thermal, mechanical property and flame retardant analysis of bio-based rigid polyurethane foam modified with expandable graphite Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-11 Xu Zhang, Zhaoqian Wang, Yujia Fu, Zhi Wang, Hua Xie
As an energy-efficient building material, rigid polyurethane foam (RPUF) has attracted attention. However, there are still great challenges in how to easily prepare RPUF materials with good mechanical properties, flame retardant properties, thermal insulation and other properties. In the current work, expandable graphite (EG)-modified lignin-based polyol (RPUF) was prepared by a one-step method. Thermogravimetric
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Superheated fuel sprays: A comparative study of flash boiling ammonia fuel sprays with methanol, ethanol, and gasoline for multi-hole fuel injection Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-11 Muhammad Saad Akram, Qiang Cheng, Ossi Kaario, Martti Larmi
The rising energy demand creates a huge need to explore and implement sustainable alternative fuels e.g., ammonia, hydrogen, methanol, ethanol, etc. to mitigate emission challenges and significantly lower CO emissions. Ammonia has gained much attention as promising alternative fuels for internal combustion engines due to its carbon-neutral nature, which can reduce the carbon footprint in transportation
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Computation of soret effect in sisko nanofluid flow over a stretching sheet encompassing chemical reaction and viscous dissipation Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-11 Yogesh Dadhich, Reema Jain, Ananya Jain, Saiful Islam, Majed Alsubih
This article examines the characteristics of mass and heat transfer in Sisko fluid flow. The consideration is given to continuous, two-dimensional movement of Sisko fluid exhibiting incompressible and viscous characteristics. The fluid flows over a stretching sheet encompassing chemical reaction and subjected to the soret effect and viscous dissipation. The arising set of interconnected PDEs is converted
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FSI investigation on the discharge valve lift in a R32 rotary compressor and its verification Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-10 Junlong Xie, Wang Zeng, Xi Pan, Jianye Chen, Jianjun Ye
R32 rotary compressor is commonly applied in the household air conditioner. The valve motion is significant to the performance and reliability of rotary compressor. Valve lift is an important factor which directly affects the valve motion. A suitable valve lift can both reduce power consumption and fracture risk of valve plate. Based on a compressor prototype, this paper developed a FSI model to simulate
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Experimental and numerical studies of NO reduction by ammonia in different methane flame positions Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-10 Xin Wei, Mingyan Gu, Shuanglong Li, Yong Wu, Mian Chen, Jike Liang, Qifu Lin
Blending ammonia with methane for combustion can reduce carbon emissions and improve the flame characteristics of ammonia combustion. However, blending ammonia with methane can easily lead to high concentrations of NOx emissions. This study investigates the impact of different ammonia and methane blending methods on the flame structure and NOx emission by experiments and CFD numerical simulation. The
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A numerical and experimental investigation of the impact of wire mesh on vertical solar still Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-10 Mohammadreza Abbaspour, Qadir Esmaili, Abas Ramiar
One of the most pressing challenges facing human society is the lack of freshwater, Traditional desalination is energy-intensive, posing challenges in energy-scarce regions, especially in less developed nations. Solar stills are a promising alternative but face efficiency limits due to design constraints. Previous studies have employed techniques like integrating reflectors and combining them with
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Exploring novel approaches on impact of micro-fin tubes on flow boiling heat transfer using R134a refrigerant: A parametric case study Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-10 Neeraj Kumar Vidhyarthi, Sandipan Deb, Sameer Sheshrao Gajghate, Sagnik Pal, Ajoy Kumar Das, Debabrata Barik, Milon Selvam Dennison
This paper experimentally investigates the factors influencing the flow boiling heat transfer of R134a refrigerant within smooth and micro-fin tubes having an outer diameter of 9.52 mm. The tube has a peculiar micro-fin shape with a 46° apex angle and 22° helix angle, producing a surface area 1.62 times bigger than a smooth tube of identical diameter. The main goal of the study is to understand the
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Simulation of ambient temperature and humidity distribution in eight-span greenhouse under different wind conditions and corn height Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-10 Qianjun Mao, Hongwei Li
The greenhouse environment suitable for crop growth usually depends on reasonable ventilation, and outdoor air flow state and indoor crop height are important factors affecting the ventilation effect. This study conducted simulation and experimental research on corn cultivation in an eight-span plastic greenhouse, analyzing the effects of outdoor wind speed, wind direction, and indoor crop height variations
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Thermal performances of Gyroid-fin heat sink for power chips Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-10 Mingyi Chen, Yusheng Shi, Lei Yang, Chunze Yan, Bo Song, Yongjiang Liu, Zechun Dou, Yanping Chen
As a kind of triply periodic minimal surface (TPMS), the Gyroid-TPMS is utilized for fluid cooling system with good hydraulic and thermal performances. In this study, a special fin structure based on Gyroid-TPMS, referred to as the Gyroid-fin, is designed to replace the plate-fin of the conventional heat sink (HS) for cooling the integrated power chips. The multi-physical simulations are modelled for
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Study on circulating cooling water pre-mixing for thermal performance improvement of twin thermal power units sharing one dry cooling tower Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-10 Huan Ma, Baigong Wang, Liang Cai, Fengqi Si
For an advanced power plant of twin thermal power units sharing one dry cooling tower, power production is easily impacted by variations in cooling tower performance. Circulating cooling water pre-mixing (CCWPM) was proposed to maximize cooling potential of the tower under varying working conditions, thereby enhancing power generation for the whole power plant. An integrated simulation model was established
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Corrigendum to “Modeling study of the energy separation effect of a control valve structure on a vortex tube” [Case Stud. Therm. Eng., volume 61, september 2024, 104828] Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-08 Shuyang Liu, Dejun Gan, Zhihong Han, Zhiyuan Huang, Qiang Li, Jian Zhang
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Temperature field analysis in tunnel construction ventilation with emphasis on duct leakage and thermal conductivity Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-08 Lintao Fan, Liangliang Tao, Shuqi Duan, Mingrui Luo, Chuan He, Yanhua Zeng, Yongliang Chen, Yin Song, Zhanfeng Qi
Mechanical ventilation is the primary measure for cooling during construction of high geo-temperature tunnel. Based on heat transfer theory and characteristics of press-in ventilation, a comprehensive calculation model considering the influence of construction process is proposed, and the reliability of the model is verified by on-site test. The effects of duct leakage rate and thermal conductivity
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Additive manufactured high-performance topology-optimized lattice structure: Compressive behavior and flow heat transfer characteristics Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-08 Peipei Lu, Xiaojie Shi, Xiu Ye, Hongfeng Wang, Meiping Wu
In this study, topological optimization techniques were employed to construct innovative TopS lattice structures, to achieve a lightweight design while simultaneously optimizing their mechanical properties and enhancing flow and heat transfer performance. Through model reconstruction and proportional scaling techniques, lightweight configurations with increased surface areas were achieved, leading
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Transient temperature analysis and engineering application of steel shell immersed tunnel protected by fireproof board Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-08 Peng Cao, Qingliang Wu, Enlong Liu, Huixian Wang
Based on the Shenzhen-Zhongshan Link, the transient analytical solution of the steel shell immersed tunnel under the protection of fireproof board was deduced and verified through fire test. Then, the variation of the maximum temperature of the bottom steel shell with the thickness and thermal conductivity of the fireproof board was analyzed and suggestions on the selection of fireproof boards were
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Heat release efficiency Betterment inside a novel-designed latent heat exchanger featuring arc-shaped fins and a rotational mechanism via numerical model and artificial neural network Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-07 Caozheng Yan, Pradeep Kumar Singh, Oumayma Hamlaoui, Mohamed karim hajji, Yasser Elmasry, Ahmed huseen Redhee, Barno Sayfutdinovna Abdullaeva, Hakim AL Garalleh
Thermal energy storage (TES) units featuring phase change materials (PCMs) have a crucial impact on efficient energy management. Since energy demands keep changing, and the world increasingly relies on sustainable energy sources, innovation is continuously required. New technologies, materials, and methods for energy storage must be developed to meet these shifting needs effectively. In this study
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Investigation of co-combustion characteristics and kinetics of low-ranked coal and hydrochar derived from cow manure Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-07 Sawat Poomsawat, Kitipong Jaojaruek, Wijittra Poomsawat
CO emission should be reduced by the effective utilization of low-ranked coal in a coal-based power plant based on co-combustion of coal and biomass. This study investigated the co-combustion behavior of lignite and cow manure using three different kinds of samples: raw lignite coal blended with cow manure (CM-L), raw lignite coal blended with hydrochar derived from cow manure (HCM-L), and co-hydrothermal
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Experimental investigation of performance, emission, and combustion characteristics of a diesel engine using blends of waste cooking oil-ethanol biodiesel with MWCNT nanoparticles Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-07 M. Sonachalam, V. Manieniyan, R. Senthilkumar, Ramis M K, Mahammadsalman Warimani, Raman Kumar, Ankit Kedia, T.M. Yunus Khan, Naif Almakayeel
In this study, blends of 5 % and 10 % ethanol with waste cooking oil biodiesel are mixed with Multi-Walled Carbon Nanotubes (MWCNT) at a concentration of 30 ppm. MWCNTs, known for their high surface area and unique properties, are added to potentially enhance combustion efficiency and reduce emissions. These blends are then tested in a diesel engine to evaluate their performance, emission and combustion
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Aerodynamic optimization of multi-stage axial turbine based on pre-screening strategy and directly manipulated free-form deformation Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-07 Yixuan Guo, Jiang Chen, Yi Liu, Hang Xiang, Mingsheng Chen
To address the challenges of multiple design variables, long evaluation times, and poor global search capability of traditional surrogate-assisted algorithms that rely on the complete substitution of accurate function evaluations in the turbine aerodynamic optimization process, a pre-screening surrogate-assisted elitist preservation genetic algorithm (pre-SAEGA) optimizer is proposed. Pre-screening
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Numerical heat transfer analysis of steam injection into subcooled water Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-07 Mubasher Rasheed, Ajmal Shah, Abdul Quddus, Muhammad Umer Khan Mughal, Muhammad Imran Saqid, Altaf Hossain Molla, Zambri Harun, Zulkhairi Zainol Abidin, Amin Etminan
Steam direct contact condensation (DCC) into subcooled water may be encountered in different important industrial process applications, such as steam jet pumps, steam ejectors, pressurizers, and emergency cooling systems of nuclear reactor core. In this work, a numerical simulation study has been done for injection of steam into a tank full of subcooled water. In the simulations, the Eulerian multiphase
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The development of exothermic surface reaction between coal and oxygen affected by methane during coal spontaneous combustion in gob Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-07 Xincheng Hu, Jiawen Cai, Zhaoyang Yu, Jianguo Liu, Zongqing Tang, Shengqiang Yang
Coal spontaneous combustion (CSC) derives from the exothermic coal-oxygen reaction occurring at coal's surface. However, methane's influence on this process is still unclear in gob environments. To this end, non-isothermal experiments were performed to elucidate methane's impact on the exothermic effect, pore structure evolvement, and surface composite variation in CSC. Our findings indicated that
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Prediction of key performance indicators of multi-effect vacuum membrane distillation systems integrated with PVT and Organic Rankin Cycle Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-07 Fahad Awjah Almehmadi, Abdullah Najib, Hany Al-Ansary
The study presented a numerical simulation conducted using MATLAB® to analyze the performance of a poly-generation system. This system comprises solar collectors, a Photovoltaic-Thermal (PVT) system, an Organic Rankine Cycle (ORC), and a multi-effects vacuum membrane distillation (V-MEMD) system. The study investigates the impact of changes in operating conditions of the water stream on the performance
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Performance analysis of the infrared gas stove with a vertical ejector Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-06 Xianying Hao, Zhiguang Chen, Yitong Xie, Chaokui Qin, Zhicong Fang
Energy conservation and emission reduction are critical global concerns, with infrared gas stoves recognized for their superior thermal efficiency and low emissions. However, research on infrared gas stoves with vertical ejectors, particularly those designed for use in horizontally constrained spaces, remains sparse. To bridge this gap, an experimental system is constructed to investigate the effects
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Conjugate heat transfer analysis on composite cooling structure with low Reynolds number using the decoupling method Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-06 Pingting Chen, Dingcheng Zhang, Haibin Liu, JunKui Mao
Composite cooling is a critical strategy for managing high temperatures in aero engine turbines. With the trend toward flying at unprecedented altitudes, the operational Reynolds number (Re) for turbines decreases significantly compared to conventional aircraft. This shift raises questions about the impact of low Re on the overall cooling effectiveness of composite cooling structures. The primary objective
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Artificial intelligence technique development for energy-efficient waste-to-energy: A case study of an incineration plant Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-05 Da-Sheng Lee, Shang-Tse Lee, Yen-Tang Chen, Po-Yu Su
The increasing heat value and complexity of waste types in Taiwan's incineration plants have led to reduced facility capacity and utilization rates. Traditional control systems struggle to manage rapid and irregular fluctuations in waste heat values, often resulti ng in poor stability and prolonged response times. This study introduces an artificial intelligence-based heat value prediction and combustion
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Investigation of temperature variations across the hot and cold sides of cascaded thermoelectric generator (CTEG) configurations in PV-CTEG hybrid systems Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-05 Abdelkader Rjafallah, Daniel Tudor Cotfas, Petru Adrian Cotfas
Cascaded thermoelectric generators (CTEGs) are increasingly used to enhance energy generation in photovoltaic (PV) cells under concentrated solar irradiance. However, research on temperature variation patterns on both sides of CTEGs, due to nonuniform irradiance and imperfect cooling, is limited. This paper explores a circular pattern, a central circular region surrounded by concentric rings, alongside
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Physical characteristics due to activation energy of dissipative heat transfer in Reiner–Philippoff nanofluid with Darcy–Forchheimer model Case Stud. Therm. Eng. (IF 6.4) Pub Date : 2024-09-05 Nourhan I. Ghoneim, A.M. Amer, Khalid S.M. AL-Saidi, Ahmed M. Megahed
This study aims to thoroughly investigate the flow behaviour of a Reiner–Philippoff nanofluid over a nonlinearly stretching sheet, with a particular focus on the effects of viscous dissipation. The research delves into the complex interactions within the nanofluid, assessing how viscous dissipation influences heat and mass transfer rates. To model the nanofluid flow, the Darcy–Forchheimer model was