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Irreversibility of Al2O3-Ag hybrid nanoparticles in mixture base fluid on microchannel with variable viscosity, buoyancy forces, and suction/injection effects: An analytical study Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-03-16 Ameur Gabli, Mohamed Kezzar, Hamza Berrehal, Ravinder Kumar, Pawan Kumar, Lilia Zighed, Mohamed. Rafik. Sari
The development of inherent irreversibility in the system is caused by single phase Poiseuille flow considering hybrid nanoparticles () and mixture fluid (water and ethylene glycol ) in the upright microchannel with unequal viscosity. Taking into account the buoyancy force, suction/injection at the walls, and the form factor and geometry of the nanoparticles. The modeling is based on nonlinear PDEs
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Comparison of RANS and LES turbulent flow models in a real stenosis Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-03-16 D. Lopes, H. Puga, J. Teixeira, R. Lima, J. Grilo, J. Dueñas-Pamplona, C. Ferrera
This study focuses on the performance of various turbulence models in predicting hemodynamic variables within a patient-specific geometry of the Brachiocephalic trunk exhibiting a severe stenosis. Numerical simulations employing Reynolds-averaged Navier-Stokes (RANS) and Large Eddy Simulation (LES) models were conducted, comparing four RANS with two LES models. Results indicated significant differences
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Are random forests better suited than neural networks to augment RANS turbulence models? Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-03-15 Pedro Stefanin Volpiani
Machine-learning (ML) techniques have bloomed in recent years, especially in fluid mechanics applications. In this paper, we trained, validated and compared two types of ML-based models to augment Reynolds-averaged Navier–Stokes (RANS) simulations. The methodology was tested in a series of flows around bumps, characterized by different levels of flow separation and curvatures. Initially, the ML-based
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Effects of shear intensity on the linear instability of viscoelastic Rayleigh-Bénard-Poiseuille flow Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-03-11 Zhen-Ze Yao, Cai-Lei Lu, Chu-Tong Zhou, Kang Luo, Hong-Liang Yi, He-Ping Tan
We study the two-dimensional Rayleigh-Bénard-Poiseuille flow in a viscoelastic fluid using linear stability analysis and energy analysis. Different from the case of Newtonian fluids, three instability regimes are identified when gradually increasing the shear intensity (characterized by the Reynolds number ). In regime I with a very small , the viscoelasticity has destabilizing effects on the flow
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Theoretical derivation and analysis of flow resistance formula in porous media based on variable diameter tube ball model Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-03-07 Kuncan Zheng, Ben Liu, Fangyuan Ren, Shengyue Yang, Zhendong Li, Junlei Hu
Porous media can be seen everywhere in our production and life. It has extremely important applications in many fields such as energy, chemical industry, metallurgy, petroleum, construction, soil, materials, aerospace and nuclear reactors. However, it is difficult and hot to calculate the flow resistance. In this paper, a variable diameter tube ball model is established based on the actual porous media
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Analysis and numerical simulation of pool boiling heat transfer in porous medium combined with 2D MCFC composite structure Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-03-06 Yingjie Kang, Zhongmin Lang, Gangqiang Wu, Yaxiong Wang, Yunfei Wang
As the issue of energy becomes increasingly prominent, the field of heat dissipation necessitates more advanced thermal energy utilization technologies. Pool boiling is employed in aerospace and petrochemical and other fields due to its high heat transfer performance. In this research, we propose a composite structure designed to enhance boiling heat transfer performance from the perspective of bubble
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Flow boiling of liquid nitrogen in a horizontal macro-tube at low pressure: Part I - flow pattern, two-phase flow instability, and pressure drop Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-03-06 Yuan Gao, Zuoxia Wang, Yulong Li, Enze Ma, Heng Yu
Liquid nitrogen holds significant importance in high-temperature superconductivity. This study experimentally investigates the saturated flow boiling of liquid nitrogen in a horizontal macro-tube with an inner diameter of 10 mm. The experiments cover the following ranges: inlet gauge pressure from −31.0 to 2.5 kPa, mass flux from 27.0 to 71.3 kg/(m·s), heat flux from 0 to 28.68 kW/m, and vapor quality
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Hybrid RANS/LES modeling of hypersonic turbulent boundary layers with cold walls Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-03-05 Mustafa E. Danis, Paul Durbin
Various strategies for hybrid RANS/LES modeling of hypersonic turbulent boundary layers subjected to strong wall-cooling are developed and analyzed. By defining a turbulent thermal length scale, the eddy viscosity and diffusivity of the hybrid model are calculated by the same formula, . This allows a similar blending of the length scales and the development of analogous dynamic models for turbulent
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Multi-objective optimization design of internal cooling structure of a sensor probe Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-03-05 Saile Zhang, Huilong Zheng, Zhongya Zhang, Tan Zhang, Xiaofang Yang
This paper presents the design of new internal cooling structures basing on NACA00XX fins in the cooling channel of a sensor probe. Numerical simulations are conducted to compare the flow and heat transfer performance of each fin structure under different working conditions. The Nusselt number and friction factor are used as objective functions, considering the flow and heat transfer performance. The
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Corrugation characteristics effect of channel on heat transfer and pressure Drop: Experimental study Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-03-04 Reyadh Ch. Al-Zuhairy, Zaid S. Kareem, Dhamyaa S. Khudhur, Hyder H. Balla
Four sinusoidal wavy channels were examined experimentally under turbulent flow conditions of air to clarify the potentials of such configuration in terms of heat transfer and hydrodynamic performance. The subjected heat flux on these wavy walls (sinusoidal wavy plates) were (500, 750, and 1000) W /m. The ratio of corrugation wavelength () to corrugation amplitude () had a range of (5.7–12.6), and
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Large eddy simulation of combustion characteristics during dual fuel switching process in gas turbine combustor Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-03-02 Chuanlong Hu, Fuquan Deng, Xiao Liu, Shilin Yan, Jinghe Lu, Chengwen Sun, Hongtao Zheng
The present study aims to investigate the combustion characteristics, fuel switching strategy, and flame stability associated with fuel switching processes in a dual-fuel gas turbine combustor. Specifically, the Large Eddy Simulation method is employed in conjunction with a skeletal chemical reaction mechanism to simulate the fuel switching process. It is revealed that the presence of a local rich
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Resolvent analyses of incompressible turbulent channel, pipe and boundary-layer flows Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-03-02 Wenkai Zhu, Xianliang Chen, Lin Fu
This work investigates the linear responses of turbulent mean flow to harmonic forcing in incompressible channel, pipe, and zero-pressure-gradient boundary-layer flows. Employing established universal relations, the mean flow and associated eddy viscosity at are obtained. This research reveals that the most amplified perturbations in all three flows are streamwise uniform, corresponding to streamwise
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Buoyancy effects on very-large-scale motions and amplitude modulation in convective atmospheric surface layers Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-03-01 Hongyou Liu, Xiaojing Zheng
A large amount of high-Reynolds-number experimental data was obtained from long-term observations of the atmospheric surface layer in the Qingtu Lake Observation Array under different thermal stability conditions. To reveal the thermal effects, the variations of the scales of turbulent coherent structures, energy distribution and amplitude modulation as a function of thermal stability are investigated
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Evaluation of variable rotation on enhancing thermal performance of phase change heat storage tank Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-03-01 Bo Yang, Junfei Guo, Xinyu Huang, Ze Li, Xiaohu Yang, Ming-Jia Li
The rotation mechanism can effectively enhance convective heat transfer. Previous studies have been conducted to explore the potential application of its enhancement effect for melting process. It is of importance to highlight that the variable speed strategy offers more significant advantages for phase change heat storage devices with non-uniform melting characteristics. This study aimed to explore
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Machine learning-driven approach for predicting the condensation heat transfer coefficient (HTC) in the presence of non-condensable gases Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-02-28 Samah A. Albdour, Yacine Addad, Shahid Rabbani, Imran Afgan
This research focuses on developing a predictive model that can effectively estimate the condensation heat transfer coefficient (HTC) on vertical tube surfaces during free-fall. The model takes into consideration the presence of non-condensable gases. The main objective is to assemble an extensive and varied database that encompasses different geometric parameters and operational conditions. The motivation
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Numerical investigation of non-Newtonian nano fluid flow in spiral ducts with different cross sections Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-02-27 Morteza Rahmanpour, Sina Shenavar, Mohsen Fallah
Spiral tube heat exchangers represent a conventional type of exchanger that finds use in industries such as food, chemical reactors, ventilation, and heat recovery systems. The compact structure, high mass, and heat transfer coefficient of spiral tubes have made them popular in many industries as heat exchangers. This article delves into the investigation of the flow of non-Newtonian Nano fluid CuO-CMC
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Experimental and numerical analysis of a hybrid cooling concept for an electric battery module Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-02-26 Seham Shahid, Martin Agelin-Chaab
This paper introduces a novel hybrid thermal management concept, which use secondary coolants (air and water) to extract heat from a phase change material (paraffin), resulting in increased heat extraction capability of the paraffin and improvement the overall thermal performance of the battery module. This concept was analyzed using experimental and numerical studies. The experimental studies were
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Cooling effects of the derived coolant-film layer from partitioned porous injectors for transpiration cooling Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-02-26 Zhihui Zhang, Xian Wang
This study aims to reveal the cooling benefits of the derived coolant film from partitioned porous injectors for transpiration cooling. The near-wall flow development and the cooling performance are investigated based on various layouts of porous injectors. The numerical investigation is conducted using an in-house recursive regularized thermal lattice Boltzmann method (RR-TLBM). The validated RR-TLBM
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Flow over a 25°Ahmed body at a Reynolds number characteristic of suburban driving speeds Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-02-25 Skylar Polek, Yi-Tung Chen, Melissa Morris
Four turbulence models were used to predict the flow over a 25°Ahmed body at a Reynolds number characteristic of suburban driving speeds in the United States: the - shear stress transport (SST) model, large eddy simulation (LES) with the Smagorinsky-Lilly subgrid scale model, LES with the wall-adapting local eddy viscosity (WALE) subgrid scale model, and improved delayed detached eddy simulation (IDDES)
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Numerical analysis of mathematical model for heat and mass transfer through Bioconvective Maxwell nanofluid flow subject to Darcy-Forcheimer and Lorentz forces Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-02-23 Muhammad Abdul Basit, Muhammad Imran, Madeeha Tahir, Aboulbaba Eladeb, Lioua Kolsi
The objective of this study to evaluate heat and mass transport rate of Maxwell nanofluid flow through a stretched medium in the existence of Darcy-Forcheimmer and Lorentz forces. In addition to above by involving motile microorganisms the heat and mass transport done through the process of bioconvection. Thermal radiation, activation energy, Brownian motion, and thermophoresis effects on the flow
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Detailed visualization experiments on the start-up process and stable operation of pulsating heat pipes: Effects of internal diameter Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-02-22 Po-Shen Cheng, Shwin-Chung Wong
In the present work, detailed flow characteristics in glass pulsating heat pipes (PHPs) are pioneeringly organized into category charts based on careful visualization during the start-up and the steady operational periods, respectively. Two IDs of 6 mm and 3 mm are studied and compared. The larger ID of 6 mm weakens the effect of surface tension that all the water sinks to the bottom after the filling
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Energy efficient actuated drag reduced compressible turbulent flat plate flow Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-02-22 Marian Albers, Xiao Shao, Wolfgang Schröder
Direct numerical simulations of active drag reduction using streamwise traveling waves in compressible turbulent boundary layer flow are conducted. The flow at a momentum thickness Reynolds number of is actuated by sinusoidal wall deflections traveling in the streamwise flow direction at wave speeds slightly above the freestream velocity. The results show a significant drag reduction, i.e., a decrease
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In-situ synthesis of cuprous oxide nanofluid using ribose for enhanced thermal conductivity and stability Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-02-22 D. Krishna Bhat, S. Pavan Kumar, U. Sandhya Shenoy
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Combustion enhancement and performance analysis of T-shaped rod-assisted methane/air combustors for micro-thermophotovoltaic systems Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-02-22 Weixuan Li, Jiangbao Zeng, Guizhen Bian, Xiran Liu, Lei Han, Tao Cai
To enhance the thermal performance and power output of micro-thermophotovoltaic systems, this work conducts a comprehensive numerical analysis of the T-shaped rod-assisted methane/air-fueled combustion. With the validated computational model, the effects of key parameters including the rod axial location (), height (), and material are systematically evaluated. Varying from 3 to 12 mm can lead to a
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Effect of wall curvature on heat transfer and hydrodynamics in a ribbed cooling passage Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-02-17 Shao-Fei Zheng, Wen-Kai Lian, Jia-Xing Meng, Yan-Ru Yang, Shu-Rong Gao, Bengt Sunden, Xiao-Dong Wang
Simplified rectangular ribbed cooling passages with a flat wall are extensively considered in exploring the internal cooling features of turbine blades, but the realistic blade has a twisted shape inherently. The effects induced by the curved wall have not been clarified in detail. In this work, adopting a verified turbulence model, numerical investigations are completed to evaluate the effects of
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A resolvent analysis of the effect of passive perforated surfaces on wall-bounded turbulence Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-02-17 Azadeh Jafari, Beverley J. McKeon, Benjamin C. Cazzolato, Maziar Arjomandi
This study investigates passive perforated surfaces that permit unsteady wall transpiration at specific frequencies in response to pressure fluctuations at the wall. These surfaces are described to interact with the wall-bounded turbulence through imposing an impedance boundary condition. A theoretical framework based on resolvent analysis was employed to evaluate the turbulent channel flow response
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Performance of boilers equipped with vapor-pump (BEVP) system equipped with a novel air-flue gas total heat exchanger Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-02-16 Jing Hua, Jingyi Wang, Tingting Zhu
Because of high humidity and nonlinearity of flue gas, waste heat from flue gas is hard to recovery. Boilers equipped with vapor-pump system is developed to solve the problem caused by high humidity. In this system, double spray towers subsystem is equipped to realize total heat waste heat recovery. However, caused by nonlinearity, limited waste heat recovery efficiency is just 83 % (1 segment) and
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DNS analysis of the effect of control parameters on the heat transfer performance of intermittently controlled impinging jets Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-02-16 Koki Fujimori, Koichi Tsujimoto, Toshitake Ando, Mamoru Takahashi
Impinging jets are used industrially in various applications such as heating and cooling. However, multiple impinging jets (MIJ) create a complex flow field due to interference between the individual jets, which hinders heat transfer. In order to solve the problem of heat transfer performance in MIJ, a new control method must be developed. This study introduces intermittent control to 13 hexagonally
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Turbulent kinetic energy transport in high-speed turbulence subject to wall disturbances Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-02-15 Ming Yu, QiLong Guo, ZhiGong Tang, Bo Li, XianXu Yuan
Wall disturbances in high-speed turbulent boundary layers induce large-scale motions in the outer region even when the Reynolds number is not sufficiently high for their existence in the case of smooth wall flows. In the present study, we investigate the dynamics of these outer region large-scale motions by exploiting the scale-by-scale energy transport in the spectral space. By scrutinizing the disparity
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Numerical investigation of heat transfer characteristics of Pin-Fins with C-Shaped-Recessed endwall in gas turbine blades internal cooling channel Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-02-14 Trong-Cuong Pham, Mai-Anh Bui Thi, Khanh-Duy Cong Do, Duy-Hung Chung, Thu-Thuy Nguyen Thi, Duc-Huy Ta, Duc-Anh Nguyen, Van-Minh Le
Pin-fin cooling has long been a crucial technique employed in gas turbine blades to manage the extreme thermal conditions experienced during operation. While numerous studies have investigated the heat transfer characteristics of different pin–fin configurations, the substantial impact of the endwall of the cooling channel on the heat transfer capability of turbine blades has not received adequate
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Evaporation of high-volatile binary sessile drop: Influence of concentarion Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-02-14 Jun Qin, Christophe Minetti, Yuequn Tao, Carlo Saverio Iorio, Qiu-Sheng Liu, Andrey Glushchuk
The evaporation of binary mixture drops has shown significant potential for industrial applications in the past decades. While the majority of scientific research was devoted to water-based mixtures In this study, we aimed to investigate the impact of component concentration and volatility on binary drop evaporation. Specifically, drop evaporation experiments were conducted on Ethanol-HFE7100 and Isopropanol-HFE7100
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An analysis of drag reduction using spanwise forcing on rough walls Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-02-12 Sina Nozarian, Mahdi Abkar, Pourya Forooghi
Spanwise opposed wall-jet forcing has been shown to reduce the skin-friction drag of wall-bounded turbulent flows by suppressing the near-wall turbulent motion (Yao et al., 2018). In the present work, the response of this drag reduction mechanism to the presence of surface roughness is studied. To this end, direct numerical simulations of flow in smooth and rough plane channels at a matched friction
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Natural convection within enclosures for thermal management in low-pressure environments Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-02-10 Akshat Patel, Zeeshan Ahmed, V.K. Singh
To address the need for a comprehensive understanding of thermal dynamics in electronic systems aboard airborne payloads, especially within the unique thermal environment characterized by low air pressure (), this study investigates the impact of low air pressure (1 kPa < < 100 kPa) on natural convection within vertical enclosures of varying aspect ratios (0.1 < < 10). As electronic systems continue
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Numerical study to investigate the thermal characteristic length with coupled CFD-FEM simulations Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-02-10 Herman Szűcs
This paper introduces a new technique for directly calculating the thermal characteristic length () of porous materials, addressing a critical parameter required for accurate acoustic simulations during vehicle development. The proposed method offers improved practicality over existing approaches. The research seeks to overcome the limitations of current methods, proposing a coupled CFD-FEA approach
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Influence of thermal boundary conditions on local supercritical CO[formula omitted] cooling heat transfer: A case study Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-02-09 Nicholas C. Lopes, Yang Chao, Mark A. Ricklick, Sandra K.S. Boetcher
In the literature, numerical heat transfer analysis of supercritical carbon dioxide (sCO) is often conducted in idealized tubular geometries to better understand its fundamental properties. Its sensitivity to temperature and pressure variations at supercritical conditions indicates that, unlike traditional subcritical turbulent flows in tubes, the thermal boundary condition (TBC) will have a noticeable
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Transient wall temperature response during liquid nitrogen nucleate pool boiling: CFD analysis and experimental validation Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-02-08 Kenza Bouazaoui, Maryam Dlimi, Imad Kadiri, Rachid Agounoun
The phenomenon of heat transfer by phase change (liquid/vapor) is used for wall cooling in a number of fields, including power generation, renewable energy and nuclear reactors. This choice is explained by its ability to evacuate high surface heat fluxes at relatively low wall temperatures. In most cases, cooling systems are designed based on steady-state experimental studies. However, during start-up
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Enhancement of thermal and flow characteristics in helically coiled tubes with corrugated surfaces by Genetic Algorithm based optimization Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-02-07 Safak Metin Kirkar, Alişan Gönül, Ahmet Selim Dalkilic
This study investigates the combined use of helically coiled tubes and corrugated surface structures as two different heat transfer enhancement techniques. Both the curvature ratio and corrugation form swirl and secondary flows, resulting in higher heat transfer rates. The effects of pitch and depth of corrugation on the performance evaluation criteria, Nusselt number, and friction factor are studied
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Heat transfer enhancement of forced convection magnetized cross model ternary hybrid nanofluid flow over a stretching cylinder: Non-similar analysis Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-02-06 Ahmed Jan, Muhammad Mushtaq, Muzamil Hussain
Nanofluids have exhibited substantial promise in amplifying thermal efficiency across a spectrum of industrial domains. Concurrently, the study of flow dynamics through a stretching cylinder assumes paramount importance within contemporary construction paradigms, spanning the realms of polymer processing, metal sheet manipulation, biomechanics, and advanced medical applications. Bolstering these pragmatic
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Numerical analysis of two-dimensional MHD flow and heat transfer of generalized Maxwell fluid through a rectangular pipe Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-02-06 Yanli Qiao, Xiu Yang, Huanying Xu, Haitao Qi
The study of viscoelastic fluids is of great significance and has received considerable attention in recent decades. In this work, the numerical analysis for the two-dimensional MHD flow and heat transfer of generalized Maxwell fluid through the rectangular pipe is implemented and the nonlinear behaviors of the fluid are characterized. Temporal and spatial fractional derivatives are introduced to depict
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Investigation of a nozzle guide vane cooling characteristic under one engine inoperative conditions Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-01-31 Kun Du, Tingrui Liang, Qihao Chen, Cunliang Liu, Bengt Sunden
The film cooling characteristics of turboshaft engine vanes were studied under one engine inoperative (OEI) conditions. Variations in the operating conditions caused tremendous changes in Reynolds number (), turbulence intensity () and swirling inflow of the mainstream. Therefore, pressure-sensitive paint (PSP), as a promising measuring technique, was adopted for analyzing the impacts of and on the
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Numerical investigation of thermal-mixing characteristics at vertically oriented T-junction pipelines Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-01-25 Mi Zhou, Junchen Li, Zhijie Qiu, Naiqiang Zhang
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Design and study of metal foam parameters on whole melting-solidification cycle in phase change heat storage system Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-01-23 Zhao Du, Xinyu Huang, Yuanji Li, Xiaohu Yang, Ming-Jia Li
In this study, the improved heat transfer properties of metal foam in a phase change heat storage (PCHS) system are studied. A 3-D transient numerical model of a horizontal square cavity PCHS unit is built to analyze the impact of metal foam (MF) on a complete melting and solidification process. An experimental PCHS system is then constructed to validate the numerical model accuracy during heat storage
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Numerical assessment of particle deposition reduction in turbulent bend pipe flow with a rib insertion Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-01-19 Fatima Zahrae Erraghroughi, Abdellah Bah, Anas El Maakoul, Abdellatif Ben Abdellah
Particle accumulation within curved pipes poses an ongoing challenge across various engineering and industrial applications. This research aims to explore the particle deposition within a 90° circular curved pipe when a rib is introduced, employing the Eulerian-Lagrangian methodology within ANSYS Fluent. The chosen operational conditions involve a turbulent flow with a Reynolds number of 10,000. The
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A theoretical model for ingress through turbine rim seals based on physically-observed unsteadiness Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-01-19 Hui Tang, James A. Scobie, Zheng Wang, Gary D. Lock
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Scaling analysis of incident shock wave / boundary layer interaction in the presence of expansion fan Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-01-17 Shu-zi Yang, Wen-zhong Xie, Shi-jie Yuan, Qing-rong Xiong
In this paper, the incident shock wave/turbulent boundary layer interaction (SWTBLI) in the presence of an expansion corner is investigated by numerical simulations. With the emphasis on the influence mechanism of the expansion fan for the interaction scale, the effects of the expansion corner angle and the relative positions between the shock impinging point and the expansion corner on the flow field
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Coupled heat and mass transfer to viscoelastic fluid flow in a rotating frame using series and numerical solutions Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-01-17 Saddam Sultan Akbar, M. Mustafa
Rotating flows are of paramount importance in broad range of scientific applications including geophysical flows, turbine engineering, designing jet engines, pumps and vacuum cleaners, to name a few. The majority of past research on rotating flow is conducted by ignoring viscous heating effects, which arise when mechanical energy converts into heat due to friction. Current work explores a three-dimensional
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The role of the areal parameters on turbulent flow over 2D Gaussian roughness Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-01-17 F. Bruno, M. De Marchis, E. Napoli
In the past decades, numerous efforts have been dedicated to establishing a direct correlation between a geometric parameter that represents wall roughness and the corresponding velocity reduction, known as the Roughness Function . This reduction is influenced by various statistical measures of roughness height, including average roughness height, peak-to-valley roughness distance, roughness root mean
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Direct numerical simulation of momentum and scalar internal boundary layers Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-01-16 Michael MacDonald
Direct numerical simulations (DNS) of turbulent open channel flow are performed to study and compare momentum and scalar internal boundary layers (IBL). An internal boundary layer (IBL) forms when a turbulent boundary layer is subjected to heterogeneous surface conditions. For example, a momentum IBL forms with a change in surface roughness and a scalar IBL forms due to a localised heat flux. Momentum
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Analysis of Newtonian heating in fractional hybrid nanofluid with the influence of transverse magnetic field Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-01-16 Muhammad Atif khan, Sami Ul Haq, Farhad Ali
This article deals with the effects of Newtonian heating in second grade Hybrid nanofluid. For memory effects the problem is modeled with the help of generalized Fourier law along with generalized boundary conditions. A hybrid nanofluid model is used with nano particles of the form Magnetic Iron Oxide and Silver nano particles with engine oil as based fluid. A uniform magnetic field perpendicular to
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Analysis of mixed convective stagnation point flow of hybrid nanofluid over sheet with variable thermal conductivity and slip Conditions: A Model-Based study Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-01-16 Zafar Mahmood, Khadija Rafique, Umar Khan, Adnan, Magda Abd El-Rahman, Rabab Alharbi
This research looks at the stagnation point flow of MHD hybrid nanofluid against a permeable, vertically extending surface that uses thermal radiation and how different models of thermal conductivity affect it. This study is unique because it looks at how changes in thermal conductivity, mixed convection, and the slip velocity of hybrid nanofluids affect the stretching surface. It also looks at how
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An inclusive review on structural enhancement techniques in forced condensation inside tubes Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-01-15 Anil Kumar, Ravi Kumar, Arup Kumar Das
Present review is a comprehensive approach to document and understand the role of surface structures in delivering the enhanced thermal–hydraulic performance during in-tube condensation. The present study classifies works of literature based on their primary objective of study: tube type, size, refrigerant, flow pattern, and operating conditions. The heat transfer and pressure drop observed in experimental
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Transient energy growth analysis of flat-plate boundary layer with an oblique and non-uniform wall suction and injection Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-01-15 Mayank Thummar, Ramesh Bhoraniya, Vinod Narayanan
This paper presents a non-modal bi-global linear stability analysis of an incompressible flat-plate boundary layer under the effects of oblique and non-uniform wall suction and injection. The base flow velocity profile is two-dimensional and fully non-parallel. The flow is laminar at the inflow boundary, and no reverse flow occurs in the flow domain. The Chebyshev spectral collocation method has been
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Revisiting the surface-mounted cube: An updated perspective of the near wake and near-wall flow field Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-01-14 Barbara L. da Silva, David Sumner, Donald J. Bergstrom
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Thermal examination for double diffusive MHD Jeffrey fluid flow through the space of disc and cone apparatus subject to impact of multiple rotations Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-01-13 Arshad Khan, Taza Gul, Ishtiaq Ali, Hamiden Abd El-Wahed Khalifa, Taseer Muhammad, Wajdi Alghamdi, Abeer A. Shaaban
Non-Fourier’s and non-Fick’s models enhance predictions of transient heat transfer and mass transport, especially in situations where local equilibrium assumptions break down. In such fluids, the deformation rate and shear stress display a natural parabolic structure. In this study, we explore the flow of a Jeffrey fluid with dual diffusions, incorporating both non-Fourier's and non-Fick's assumptions
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Theoretical and numerical analyses of turbulent plane Couette flow controlled using uniform blowing and suction Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-01-13 Yusuke Nabae, Koji Fukagata
We theoretically and numerically investigate the control effect of the uniform blowing and suction (UB/US) in a turbulent plane Couette flow under a constant velocity difference condition in terms of the net energy saving. First, the effective range of UB/US amplitude is derived theoretically. According to the theoretical analysis, the effective range of UB/US amplitude decreases as the Reynolds number
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Effects of header design on thermal characteristics of multi-nozzle steam spraying Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-01-13 Minsoo Kang, Ilhoon Jang, Simon Song
The distribution header of small-scale steam systems, commonly employed in household items like steam cleaners, is pivotal for dictating the spray characteristics of the steam generated. For uniform spray performance across multiple outlets, it's imperative to discern the design factors influencing this outcome. We numerically assessed the flow characteristics of steam in a spraying system with three
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Thermoelectric properties of cement mortar doped with steel fiber under heating conditions Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-01-11 Kai Guo, Guodong Chen, Mengzhou Chang, Chuang Chen, Enling Tang
In order to supply the multifunctional demand for building materials in modern construction industry, research on the thermoelectric properties of cement mortar mixed with steel fibers (diameter 0.22 mm) for engineering purposes has been carried out in this paper. The self-built thermoelectric response test system is used to collect the thermoelectric power, surface temperature and conductivity of
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Heat transfer enhancement of nanofluids in a four-blade LPD static mixer Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-01-10 Huibo Meng, Yanfeng Zhao, Yanfang Yu, Wenlong Qiao, Ge Tian
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Performance optimization of droplet formation and break up within a microfluidic device – Numerical and experimental evaluation Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-01-09 Hajar Mohamadzade Sani, Mohammad Falahi, Koorosh Aieneh, S.M. Hosseinalipour, Sara Salehi, Sasan Asiaei
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