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Implementation of concavity over heat shield of a reentry vehicle in reducing aerodynamic heating Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-05-04 Dorbala Sai Naga Bharghava, Amit Krishnat Mali, Tamal Jana, Mrinal Kaushik
Excessive amount of aerodynamic heating is a major issue for all kinds of reentry vehicles. In the present computational study, the concave heat shield modification has been used on the existing Orion CEV design to reduce aerodynamic heating. The investigations have been conducted at three different Mach numbers of 3, 6, and 7 to understand the efficacy of the model from the supersonic to hypersonic
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Fundamental heat and entropy transfer mechanisms of convection underlying the first and second laws for an unsteady multiport system and their applications in parallel flow heat exchangers Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-05-04 Bo Zhao
Although thermal convection is ubiquitous in nature and technology, it has long been argued whether convection can be considered as an independent mode of heat transfer. Here, we show that pure convection mode is generally recognized from the classical first and second laws via mass flow by rooting the unsteady mass conservation relation through an equivalent multiport system. The fundamental distinction
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Modelling urban canopy with object-based porosity model Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-05-04 M. Hadžiabdić, A. Hodža, B. Ničeno
We present a novel approach to modelling urban canopies based on the porosity model. The impact of objects in the canopy layer is implicitly accounted for by applying a high-value drag force in the parts of the canopy layer that objects would occupy. This effectively halts fluid flow in the defined space of the objects, mimicking the impact of solid objects in the canopy layer. The model addresses
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New objective Liutex vector based on an optimization procedure Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-05-03 Bowen Yan, Yiqian Wang, Yifei Yu, Chaoqun Liu
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Artificial neural networks strategy to analyze the magnetohydrodynamics Casson-Maxwell nanofluid flow through the cone and disc system space Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-05-03 Taghreed A. Assiri, Taza Gul, Zeshan Khan, Taseer Muhammad, Somayah Abdualziz Alhabeeb, Ishtiaq Ali
The Casson-Maxwell model is particularly useful for studying viscoplastic fluids or fluids with yield stress, making it applicable to various engineering applications, including extrusion processes, coating applications, and biomedical fluid dynamics. Casson-Maxwell fluid flow enhances mass transfer rates due to the combined effects of non-Newtonian viscosity and viscoelastic behavior. This is particularly
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On heat transfer in Carreau fluid flow with thermal slip: An artificial intelligence (AI) based decisions integrated with Lie symmetry Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-05-02 Khalil Ur Rehman, Wasfi Shatanawi, Abdul Rahman Mohd Kasim
It is well accepted that non-Newtonian fluid flow narrating differential systems with thermal slip conditions at the surface plays an important role in instabilities subject to polymer extrusion like stick–slip and gross-melt-fracture instabilities. Therefore, the present article contains the artificial neural networking evaluation of the friction at magnetized porous surface having thermal and velocity
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Three-dimensional simulation and artificial neural network optimization of a flat plate heat pipe for the cooling of telecommunication equipment Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-05-01 Qinli Xue, Guodong Xia, Ran Li
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DNS vs. LES: Turbulent flow in square duct with heated foil boundary Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-04-30 Jan Kren, Blaž Mikuž, Iztok Tiselj
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Local correlations for predicting the transition process in separated flows tuned with a large experimental database Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-04-30 Daniele Petronio, Pietro Paliotta, Matteo Dellacasagrande, Davide Lengani, Daniele Simoni
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Nusselt number analysis of printed circuit heat exchangers with straight and zigzag channels Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-04-27 G. Zilio, M.R. Moura, F.J. dos Santos, T.S. Possamai, M.V.V. Mortean
Printed Circuit Heat Exchangers (PCHEs) are applied in processes involving high temperatures and working pressures, such as the supercritical CO Brayton cycle. These devices are typically designed with semi-circular channels and zigzag paths to enhance thermal performance. In recent years, several Nusselt number correlations for zigzag channels have been proposed to estimate the thermal performance
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Thermo-economic analysis of organic Rankine cycle using a new two-stage solar collector with nanofluids Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-04-27 Zhong Ge, Qingyun Xiang, Jian Li, Songyuan Zhang, Zhe Wang, Jianbin Xie, Zhiyong Xie, Fubin Yang
The flat plate collector (FPC) has a low economic cost, while the parabolic trough collector (PTC) has a high heat collection temperature. To reduce costs, improve efficiency, and promote the use of solar energy, this study proposes a new two-stage solar collector that couples FPC and PTC. The main objective of this paper is to verify the performance of this two-stage solar collector when containing
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Pool boiling characteristics on the micro-pillar structured surface with nanostructure and heterogeneous wettability Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-04-27 Su Cheong Park, Hak Rae Cho, Do Yeon Kim, Seon Ho Choi, Chiwoong Choi, Dong In Yu
The nucleate boiling phenomenon is significantly affected by the wettability of the surface because it is greatly influenced by the motion of the solid–liquid–gas triplet formed by the behavior of bubbles on the heated surface. Hydrophilic surfaces have a high critical heat flux, and hydrophobic surfaces have low onset of nucleate boiling points and high heat transfer coefficients. To design an optimal
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Heat transfer enhancement for flow boiling of zeotropic mixtures with regulating liquid mass transfer resistance Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-04-26 Zhuoling Qi, Li Jia, Chao Dang, Zhonglin Yang
The mass transfer resistance is a significant element leading to heat transfer degradation of zeotropic mixtures in the flow boiling. In this paper, the heat transfer enhancement of zeotropic mixtures in the flow boiling was investigated through regulating the mass transfer resistance by constructing reasonable surface structure. The heat and mass transfer, pressure drop characteristics of stratified
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Numerical simulation of a double helix vortex structure in a tangential chamber Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-04-26 A.V. Sentyabov, D.V. Platonov, S.I. Shtork, S.G. Skripkin, A.V. Minakov
The paper investigates the flow structure in a tangential vortex chamber based on numerical simulation of unsteady turbulent flow by the LES method. The swirl flow in a cylindrical chamber was organized using 12 nozzles, supplying the flow tangentially. Three regimes were considered with different design swirl number = 5.78, 8.67, and 17.34, which was varied by closing one or two nozzle rows. The unsteady
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Natural convective heat and entropy fluxes in the first and second laws reformulated by convection mode across a vertical isothermal plate Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-04-26 Bo Zhao
Convection is identified as independent heat transfer mode from the first and second laws via mass flow by rooting the mass conservation equation in the natural convection flows over a vertical isothermal plate. The convective heat and entropy fluxes can be expressed by their potential differences with an exponential distribution of temperature difference and entropy difference for compressible fluids
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Effect of uniform electric field on the droplet deformation in uniform flow field Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-04-25 T. Asadollahi, N. Golshan Ebrahimi
In this article, we theoretically investigate the transient electric field-driven deformation of a droplet. Notably, the droplet is subjected to both a uniform flow and an electric field simultaneously. We explore two cases: one with a perpendicular arrangement of uniform flow and electric field, where the electric field is not stronger than the uniform flow, and another with an aligned arrangement
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Employing uniform and non-uniform inner twisted elliptical tubes in a double-pipe heat exchanger Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-04-25 Aliakbar Sheikhi Azizi, Omid Jahanian, Seyed Soheil Mousavi Ajarostaghi, Müslüm Arıcı
Turbulent hydrothermal characteristics in a double-pipe heat exchanger with an internal twisted elliptical tube (TET) are investigated. The impacts of aspect ratio (AR = 1.4–2), uniform twist pitch (p = 100 mm-400 mm), and non-uniform twist pitch (five cases) on flow stream characteristics and heat transfer of parallel and counter-flows are investigated numerically. Utilizing a TET with a non-uniform
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Analysis of Fluid-Solid coupling heat transfer characteristics of hydrogen circulating pump Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-04-22 Huanle Zhai, Wei Li, Jiwei Li, Leilei Ji, Yuanfeng Xu
The hydrogen circulating pump (HCP) is in a high-temperature state during operation due to the heat generated by the pressure change of the transported gas. The current research on the flow characteristics of the HCP has not taken into account the influence of internal heat transfer factors, resulting in significant errors between the research results and actual test results. In this article, we define
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Allocation optimization of two-stage compression-absorption heat exchanger Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-04-22 Jing Hua, Jingyi Wang, Tingting Zhu
Space heating demand of buildings is a significant component of global energy consumption. Lowering the operating temperatures can increase the overall energetic and exergetic efficiencies. To obtain a lower return water temperature, researchers have proposed a variety of approaches. Absorption heat exchanger is an effective way to reduce return water temperature. However, in two-stage absorption heat
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Heat transfer and flow behavior in solar thermal collector equipped with obstacles Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-04-22 Ravi Kant, Tabish Alam, Dheerandra Singh, Ahmed Sabeeh, Md Irfanul Haque Siddiqui
Solar energy, an inherently pure and abundant source of power, is integral to a myriad of daily activities. Among the various solar thermal systems, Solar Air Heaters (SAHs) are often esteemed for their economic viability and practical utility in heating spaces and drying the products.. However, sometimes the conventional SAHs are criticized for their poor performance and capability in heat transfer
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Active control and modal decomposition for the flow over a ramp Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-04-22 Philippe Gilotte, Iraj Mortazavi, Stéphie Edwige
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Investigating the effect of MXene/ethanol nanofluid in thermosyphon cooling of hybrid photovoltaic/thermal (PV/T) panels Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-04-20 Amirhosein Dashtbozorg, Ramezan Rohani, Roya Jahanshahi, Mehdi Shanbedi, Elaheh Akbarzadeh, Babak Hatamifar
Current research focuses on employing MXene/ethanol nanofluid (NF) as a working fluid in an array of two-phase closed thermosyphons (TPCT) for cooling the PV panel of hybrid solar photovoltaic/thermal (PV/T) system from the rear. Unique features such as high electrical conductivity, capacitive capacity, and hydrophilicity were the advantages of MXene nanoparticles. Moreover, comparisons between PV
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A CFD study of the aerodynamic efficiency of V-shaped fog water collectors Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-04-20 Luis Silva-Llanca, Danilo Carvajal, Dante Larraguibel, Bastián González
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Mathematical modeling of concentration influence on evaporative convection in a bilayer system of binary mixtures Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-04-19 V.B. Bekezhanova, I.V. Stepanova
A problem of evaporative buoyancy-thermocapillary convection in a two-phase system of binary media is studied. Characteristics of a joint steady flow of evaporating fluid and gas in a narrow plane horizontal channel are analyzed on the example of aqueous ethanol solution and mixture of the nitrogen with the ethanol vapor. The influence of solutal effects related to changes in the ethanol concentration
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A fast fluid–solid coupled heat transfer algorithm based on dividing the development stages of the flow field Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-04-18 Banghua Zhao, Yuanye Zhou, Chen Ding, Sujun Dong
In this study, a fast numerical method for solving the forced convection conjugate heat transfer problem was developed. The method first proposes a new dimensionless number (Fs) that represents the degree of influence of convection on the temperature field in the flow field. It delineates the stage of development of the flow field by monitoring the change in Fs to determine the moment when the flow
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Effect of increasing bypass ratio on supersonic co-flowing jet with finite lip thickness Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-04-18 V.G. Ganesan, R. Naren Shankar, K. Satish Kumar, Naveen Kumar Gupta, R. Balaji, Rahul Kumar, Tabish Alam, Dan Dobrotă
The article presents the investigation on the effect of increasing bypass ratio on a supersonic co-flowing jet with finite lip thickness for a jet exit Mach number of 2.0. Co-flowing jets of differing bypass ratios (BR = m/m, where m and m are the mass flow rate of secondary and primary jets, respectively) 3.69, 9.0, and 16.0 were employed to explore the impact of high bypass secondary jets on the
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Unsteady flow of gyrotactic microorganisms with hybrid nanofluid and higher order slips using modified Buongiorno model Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-04-18 Shahirah Abu Bakar, Ioan Pop, Norihan Md Arifin
In this work, we investigate the unsteady flow of gyrotactic microorganisms over a shrinking surface in the presence of hybrid Ag-TiO/HO nanofluid. The hybrid nanofluid considered in our analysis comprises nanoparticles with distinct properties, improving the fluid’s thermal and transport characteristics. Additionally, we incorporate higher-order slip conditions to capture the complex interfacial dynamics
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Methods for neural network based prediction of roughness-induced crossflow-like vorticity in re-entry scenarios Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-04-18 Friedrich Ulrich, Thomas Sedlmeyr, Christian Stemmer
Laminar-turbulent transition plays a critical role in the design of re-entry vehicles. This study investigates roughness-induced transition caused by a randomly distributed roughness patch. In the wake of the roughness patch, a cross-flow-like vortex is formed by the distributed roughness. The cross-flow-like vortex generates regions of strong wall-normal and spanwise gradients in the streamwise velocity
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Numerical simulation study of a multi-pipe thermal energy storage system Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-04-17 Runping Niu, Tingjun Wu
Phase Change Materials (PCM) are those which are capable of reacting to variations in temperature, pressure and other environmental conditions. But the PCM’s low heat conduction makes it difficult to satisfy the demand for charging and discharging. Accordingly, optimization of Thermal Storage Unit (TSU) is required. In this paper, the PCM loading velocity of an oval pipe with variable length and many
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CFD analysis of hydrogen and methane turbulent transitional under-expanded jets Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-04-16 Francesco Duronio, Angelo De Vita
Under-expanded jets appear in various processes of engineering interest and, among others, during the injection of gaseous fuels in the combustion chamber. In this context, large eddy simulations of under-expanded hydrogen jets were carried out adopting a low-numerical-diffusion scheme based on the flux-splitting method. Pressure ratios ranging from five to twenty and the influence of chemical species
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Passive enhanced heat transfer, hotspot management and temperature uniformity enhancement of electronic devices by micro heat sinks: A review Int. J. Heat Fluid Flow (IF 2.6) Pub Date : 2024-04-16 Qinghua Wang, Junyu Tao, Zhuo Cui, Tiantian Zhang, Guanyi Chen
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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