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A-priori evaluation of data-driven models for large-eddy simulations in Rayleigh–Bénard convection Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-04-13 Liyuan Liu, Chitrarth Lav, Richard D. Sandberg
Natural convection is a commonly occurring heat-transfer problem in many industrial flows and its prediction with conventional large eddy simulations (LES) at higher Rayleigh numbers using progressively coarser grids leads to increasingly inaccurate estimates of important performance indicators, such as Nusselt number (Nu). Thus, to improve the heat transfer predictions, we utilize Gene Expression
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Multi-objective optimization and correlation development of HPD-type perforated fins based on fluid–structure interaction analysis Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-04-12 Ling Wang, Haomai Zhang, Xingtao Shi, Yingwen Liu, Aiyan Li, Fazhong Wang, Peng Yang
In this study, in combination with the flow behavior of HPD-type fins, an HPD-type perforated fin is proposed, which reduces the flow resistance by an average of 55.9% and improves the comprehensive performance by an average of 22.3%. Subsequently, the thermal–hydraulic performance and stress analysis of HPD-type perforated fins are numerically investigated based on fluid–structure interaction analysis
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A revised Jaffrey-Hamel problem with enhanced heat transport attributes considering the Darcy-Forchheimer flow of partially ionized Power-law nanofluid Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-04-12 Sohail Rehman, Laila A. Al-Essa, A.F. Aljohani, Ilyas Khan
Partially ionised materials react differently when exposed to an outer magnetic field. In thermalfluidic systems, Hall and Ion slip parameters are crucial for decreasing loss of heat. This article offer an appropriate approach for computing an inadequate Jeffery-Hamel flow and heat transport of a partially ionzied Power-law nanofluid. The Jeffery-Hamel flows has a variety of practical application where
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Turbulence characteristics of corner flow and modification of elliptic relaxation function in Phit–f k–ε model Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-04-12 Sin-Yeob Kim, Hyoung Kyu Cho
Numerous experimental and analytical studies have investigated corner flows, revealing symmetric flow characteristics and reduced turbulence production along the corner bisector. However, the underlying formation mechanisms of the flow characteristics have not been discussed. This study proposes that the reduction in turbulence production along the corner bisector is due to the cancellation of vortex
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Experimental study on flow boiling characteristics of R134a inside high-heat-flux microchannels Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-04-09 Zhiqiang Zhang, Li Jia, Chao Dang, Yi Ding
Flow boiling in parallel microchannels is an efficient method to deal with the high heat flux removal challenge for electronic modules. In this work, the visualized experiments on the R134a flow boiling inside a high-heat-flux microchannels heat sink were performed. The heat sink contains 27 parallel microchannels with a hydraulic diameter of 0.89 mm and a length of 30 mm. The experiments were conducted
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Frosting performances of ambient air vaporizer in LNG for different fin numbers Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-04-09 Wenke Zhao, Kaihan Xie, Xiaoya Cao, Yaning Zhang, Bingxi Li, Jie Xu
This study modified a model based on the Euler-Euler model to describe the frosting performances of the AAV (Air Ambient Vaporizer) heat transfer process in the LNG (Liquefied Natural Gas) industry at ultra-low temperatures. The moisture and temperature contours were presented to illustrate the impacts of moisture and temperature fields on the frosting performances. The performances including the frost
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Thermal-hydraulic performance of various designs of microchannel heat sink with internal bifurcations Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-04-04 Ali Radwan, Osama Abdelrehim, Müslüm Arıcı, Ahmed Saad Soliman
Microchannel Heat Sinks (MCHS) can dissipate large amounts of heat in a compact area making them a main choice for managing heat in space-limited applications. Recently, with the help of 3D metal printing, it became easy to fabricate various designs of MCHS with internal complex designs. This study, compare the thermo-hydraulic performance of three bifurcation based MCHS designs, with the traditional
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Design and evaluation of metal foam horizontal tube-and-shell phase change accumulator: Optimal position distribution of heating tubes Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-04-04 Ze Li, Xinyi Wang, Yuanji Li, Junfei Guo, Xinyu Huang, Xiaohu Yang, Ya-Ling He
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Comparative analysis of the wake flow characteristics of single human and single column personnel walking indoors Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-04-03 Jing Song, Yongzhi Zhang, Ping Wang, Bingqiang Yang, Jiaxing Zhang, Zihan Xing
The spread of pollutants caused by personnel walking is an important factor affecting the indoor environment. Investigating the disturbance of multiple personnel on the flow field is highly important. In this study, experimentation and numerical simulation are used to study the flow field and vortex structure of human wakes. Large eddy simulation (LES) is used to simulate the unsteady wake flow of
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An accelerated time-scale decomposition algorithm for transient thermal fluid-solid coupled simulations in multi-medium systems Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-04-03 Feixue Cai, Hua Zhou, Min Yao, Zhuyin Ren
In the realm of unsteady Conjugate Heat Transfer (CHT) simulations, as those in combustion chambers, a significant challenge arises: how to effectively address both the computational cost and the inherent stiffness resulting from the notable disparity in time scales between fluid and solid domains, especially in the multiple fluid–solid coupled systems, such as the combustor liners equipped with Thermal
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The influence of cooling medium and cooling channel on heat transfer of textured seal in presence of viscous dissipation Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-04-03 Minfeng Yu, Xudong Peng, Xiangkai Meng, Jinbo Jiang, Yi Ma
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Experimental study on the effect of sound waves on the heat transfer characteristics of heated pipes Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-03-30 Yanfeng Yang, Chaolin Liu, Yang Yang, Feng Xin
This study has experimentally investigated the heat transfer characteristics of a heated steel pipe (diameter = 20 mm) placed horizontally in a vertical experimental cylindrical pipe under longitudinal sound waves. The ranges of sound parameters used in this study are as follows: sound frequency = 210–1000 Hz, and sound pressure level SPL = 125–135 dB. The heat transfer coefficient and Nusselt number
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Evolution mechanism and parametric investigation of relative negative pressure zone in spiral groove gas face seal for aero-engine at high rotational speed Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-03-28 Hui Li, Guoqing Li, Hao Liu, Ang Li, Xingen Lu
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Enhancement of heat transfer in thin-film flow of a hybrid nanofluid over an inclined rotating disk subject to thermal radiation and viscous dissipation Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-03-26 Amal F Alharbi, Mona Alhawiti, Muhammad Usman, Ikram Ullah, Mohammad Mahtab Alam, Muhammad Bilal
Hybrid nanofluids have drawn more attention recently due to their potential to improve heat transfer in solar water heaters. However, it is still difficult to accurately predict how these nanofluids will behave when they flow over inclined rotating disks. The present work thoroughly analyses thin-film's 3D steady hybrid nanoliquid flow across an inclined spinning disk. The hybrid nanoliquid is a combination
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A multiphase heat transfer model for spreading wall film coupled with solid wall temperature field Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-03-25 Ankith Ullal, Youngchul Ra, Seong-Young Lee, Shiyou Yang
A simplified model for wall film impingement, spreading and evaporation is proposed in this work. The performance of the model was compared with experimental data. For the experimental data, a 2.8 mm diameter diesel drop at 423 K was impinged on a stainless steel wall. The solid surface and embedded temperature was recorded with time. The variation of film spread fraction, which is the ratio of the
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Bioconvection study of MHD hybrid nanofluid flow along a linear stretching sheet with Buoyancy effects: Local Non-Similarity Method Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-03-24 Umer Farooq, Haseena, Ahmed Jan, Shreefa O. Hilali, Mohammed Alhagyan, Ameni Gargouri
Nanoparticle dispersion in aqueous solutions is a remarkable scientific technique with the potential to significantly advance many branches of engineering. This is attributed to the nonsimilar thermophysical characteristics exhibited by nanofluids in contrast to conventional fluids. The current investigation explores characteristics of bioconvective magnetohydrodynamic (MHD) flow containing suspended
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Numerical study of CO2 trans-critical process inside micromodel based porous structures under supercritical pressures Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-03-23 Mengshuai Chen, Lin Chen
Understanding the flow, heat transfer, and -critical process of carbon dioxide in porous media is crucial for various applications, including CO sequestration, soil remediation and oil and gas recovery, due to its unique physical properties in the critical region. In this study, a porous media model on a microfluidic chip structure was simulated to emphasize the heat transfer and -critical process
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Numerical investigation on laser-induced nanobubble nucleation and dynamics of plasmonic nanoparticles with different structures Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-03-23 Chuanhui He, Zhiguo Xu
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Dufour and Soret diffusions phenomena for the chemically reactive MHD viscous fluid flow across a stretching sheet with variable properties Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-03-21 Showkat Ahmad Lone, Arshad Khan, Hussam Alrabaiah, Sana Shahab, Zehba Raizah, Ishtiaq Ali
The flow of fluid on a slandering stretchable sheet with variable thickness can have several engineering applications like design and optimization of, aerodynamic structures such as wings and airfoils, wind turbine blade design, efficient cooling systems for electronic devices, power plants and industrial processes. Keeping in view these important applications, this work explores Darcy-Forchheimer
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Large eddy simulations of a turbulent flow with hybrid nanofluid subjected to symmetric and asymmetric heating Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-03-21 Boudraa Bouziane, David Martin, Toutant Adrien, Bataille Françoise, Bessaih Rachid
The present study includes a comprehensive numerical analysis of the usage of nanofluids inside a thermal receiver to assess the possibility of enhancing the efficiency of this device. All simulations are performed on a small portion of a thermal receiver, similar to a bi-periodic channel subjected to symmetric and asymmetric heating. To generate conventional and hybrid nanofluids, nanoparticles of
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Viscous dissipation effects on the axisymmetric flow of Casson rheological fluid in the core region of curved artery surrounded by [formula omitted]/[formula omitted] nanofluid Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-03-20 Nomana Abid, Jafar Hasnain
Inspired by the blood flow in a curved artery, the heat transfer within the immiscible flow of Casson fluid (CF) as blood and plasma as nanofluid (NF) flow through a uniformly curved pipe is considered. The core region is filled with CF (non-Newtonian fluid), whereas the peripheral region is occupied with NF ( water/ water). Viscous dissipation is also considered. The governing equations of the flow
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Flow boiling of liquid nitrogen in a horizontal macro-tube at low pressure: Part Ⅱ – Heat transfer characteristics Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-03-19 Yuan Gao, Zuoxia Wang, Yulong Li, Enze Ma, Heng Yu
Nitrogen is the most important cryogen in superconductivity. This study investigates the heat transfer characteristics of flow boiling in a horizontal macro-tube with an inner diameter of 10 mm, particularly focusing on flow boiling at negative gauge pressure. The experiments cover the following ranges: inlet pressure from −31.0 to 2.5 kPa, mass flux from 27.0 to 71.3 kg/(m·s), and heat flux from 0
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Parametric study of water spray cooling on enhanced relatively large surfaces Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-03-18 Tianhua Chen, Zhaoxuan Liu, Qun Han, Juan Shi, Wenming Li
Spray cooling as an effective cooling technique is widely used in practice. Compared to small heating surfaces, the significantly increase of surface would pose a great challenge to the significant enhancement of spray cooling. Specially, single nozzle spray cooling suffers from non-uniform liquid thin film on a relatively large heating surface, severely inhibiting the formation of efficient thin film
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A numerical framework to investigate isotropic turbulent inflow interacting with an airfoil’s leading edge Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-03-16 Ahmed Osama Mahgoub, Chaoyang Jiang, Danielle Moreau, Con Doolan, Charitha de Silva
This paper presents a numerical framework to study the interaction of isotropic turbulence with airfoils. Specifically, the developed numerical framework is used to investigate the distortion of the turbulent structures interacting with an airfoil’s leading edge. For turbulence modeling, Large Eddy Simulation (LES) is used. The isotropic turbulent inflow for the Computational Fluid Dynamics (CFD) simulations
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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