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Journal of Thermal Science 2021年第2期30卷 363-393页

作者： ZHAO Jiafei SUN Mingrui ZHANG Lunxiang HU Chengzhi TANG Dawei YANG Lei SONG Yongchen Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education Dalian University of TechnologyDalian 116023China

A light-weight structure with sufficient mechanical strength and heat transfer performance is increasingly required for some thermal management *** porous structure with the skeleton supporting the ambient stress and the pores holding the flowing fluid is considered very promising,attracting significant scientific and industrial interest over the past few ***,due to complicated morphology of the porous matrices and thereby various performance of the pressure drop and heat transfer coefficients (HTC),the comprehensive comparison and evaluation between different structures are largely *** this work,recent researches on the efforts of forced convection heat transfer in light-weight porous structure are reviewed;special interest is placed in the open-cell foam,lattice-frame,structured packed bed,and wire-woven *** experimental apparatus,morphological of the porous structures,effect of morphology on pressure drop and HTC,and further applications are *** new method which measure morphology accurately should be paid more attention to develop more accuracy ***,the most research focused on low Reynolds number and existing structure,while very few researchers investigated the property of forced convection heat transfer in high velocity region and developed new porous structure.

关键词： forced convection heat transfer heat transfer coefficient pressure drop morphological characteristics porous structure

Evaporation of a Thin Binary Liquid Film by forced convection into Air and Superheated Steam

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Journal of Thermal Science 2010年第4期19卷 346-356页

作者： Abdelaziz Nasr Chokri Debbissi Sassi Ben Nasrallah LESTE cole Nationale d'Ingenieurs de MonastirUniversite de MonastirTunisie

This paper deals with a numerical analysis of the evaporation of a thin binary liquid film by forced convection inside a channel constituted by two *** first plate is externally insulated and wetted by a thin water ethylene glycol film while the second is dry and *** first part is concerned with the effects of inlet ambiance conditions and the liquid concentration of ethylene glycol on the distribution of the velocity,temperature,concentrations profiles and the axial variation of the evaporation *** second part is focused on the inversion temperature point of the evaporation of binary liquid *** show that the inversion temperature phenomenon for the evaporation of binary liquid mixture is observed for high liquid concentration of ethylene *** present results show that in the inlet temperature range considered here,the inversion temperature does not exit for the evaporation of pure ethylene glycol.

关键词： Binary liquid film evaporation inversion temperature forced convection combined heat and mass transfer

A CA-LBM model for simulating dendrite growth with forced convection

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Journal of Iron and Steel Research International 2021年第8期28卷 997-1008页

作者： Xiang-ning Meng Lei Cui Yi-han Shi Miao-yong Zhu Key Laboratory for Ecological Metallurgy of Multi-Metallic Ores Northeastern UniversityShenyang 110819LiaoningChina School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina

A two-dimensional coupled model of the cellular automaton(CA)and the lattice Boltzmann method(LBM)was developed to simulate the solute dendrite growth of Fe-C-Mn-S alloy in the presence of forced *** model describes the transport phenomenon by the evolution of moving pseudo-particles distribution functions and utilizes the LBM to solve fluid flow and solute transport under forced convection *** on the solute field calculated by the CA technique,the dynamics of dendrite growth were determined by the previously proposed local solute balance *** accuracy of the forced convection dendrite growth model was verified by comparing the CA-LBM model with Lipton-Glicksman-Kurz analytical *** is revealed that the dendrite symmetry structure is destroyed compared to free diffusion,and the upstream arm is more developed than the downstream arm of the *** enriched solute segregates more at the downstream side than at the upstream side of the *** length of the upstream dendrite arm increases firstly and then becomes stable with the increase in the flow velocity,the dendrite necking is restrained,and the vertical dendrite arm becomes longer.

关键词： Two-dimensional coupled model Cellular automaton Lattice Boltzmann method Dendrite growth forced convection

Phase-Field Lattice-Boltzmann Study for α-Mg Dendrite Growth of Mg-5wt%Zn Alloy with forced convection

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Acta Metallurgica Sinica(English Letters) 2023年第11期36卷 1791-1804页

作者： Wei-Peng Chen Hua Hou Yun-Tao Zhang Wei Liu Yu-Hong Zhao School of Materials Science and Engineering Collaborative Innovation Center of Ministry of Education and Shanxi Province for High-Performance Al/Mg Alloy MaterialsNorth University of ChinaTaiyuan030051China Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing100083China School of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan030024China Institute of Materials Intelligent Technology Liaoning Academy of MaterialsShenyang110004China

Melt flow can significantly change the transport of heat and solute,dendrite *** this work,a phase-field lattice-Boltzmann model was developed to studyα-Mg dendrite growth of Mg-5wt%Zn alloy with forced *** show that the existence of forced convection and overlap of thermal and solute fields makes thermal and solute fields distribution ***,the symmetry of dendrite morphology is *** solid temperature and concentration of the downstream dendrite tip front with forced convection are higher than that without forced convection,while the concentration of the upstream dendrite tip front is *** solute transport through melt flow will be hindered by developed *** flow velocity increase,the upstream temperature gradient and thickness of the downstream solute enrichment layer increase gradually,while the downstream temperature gradient and thickness of the upstream solute enrichment layer decrease ***,the upstream dendrite tip velocity will increase gradually,while the downstream dendrite tip velocity will decrease at first and then *** study is helpful to establish the relationship betweenα-Mg dendrite growth and melt flow,which is beneficial to understand the role of melt flow on dendrite morphologies.

关键词： Dendrite growth Mg-Zn alloy forced convection Phase-field method Lattice-Boltzmann method

Effect of Magnetic Field on forced convection between Two Nanofluid Laminar Flows in a Channel

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Chinese Journal of Mechanical Engineering 2016年第6期29卷 1235-1243页

作者： Afrasiab Raisi Ahmad Qanbary Engineering Faculty Shahrekord University

This paper provides a numerical study of forced convection between hot and cold nanofluid laminar flows that are separated by a thin membrane, in a horizontal channel. Outer surface of channels＇ walls are thermally insulated and divide into two parts; namely NMP and MP. NMP is the channel＇s wall from the entrance section to the middle section of channel that is not influenced by magnetic field. MP is the channel＇s wall from the middle section to the exit section of channel which is influenced by a uniform-strength transverse magnetic field. The governing equations for both hot and cold flows are solved together using the SIMPLE algorithm. The effects of pertinent parameters, such as Reynolds number （10 ≤ Re ≤500）, Hartman number （0 ≤Ha ≤60） and the solid volume fraction of copper nano-particles （0≤φ≤0.05）, are studied. The results are reported in terms of streamlines, isotherms, velocity and temperature profiles and local and average Nusselt number. The results of the numerical simulation indicate that the increase in Reynolds number and the solid volume fraction lead to increase in Nusselt number. Meanwhile, the results also show that the rate of heat transfer between the flows increases as the Hartmann number increases, especially at higher values of the Reynolds number.

关键词： magnetic field forced convection nanofluid membrane channel

Entropy generation analysis of thermally developing forced convection in fluid-saturated porous medium

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Applied Mathematics and Mechanics(English Edition) 2008年第2期29卷 229-237页

作者： K.Hooman A.Ejlali F.Hooman School of Engineering The University of QueenslandBrisbaneAustralia Fix Equipment Lead Engineer Namavaran Delvar Engineering and Construction CompanyTehranIran Chemical Engineering Department Sharif University of TechnologyTehranIran

Entropy generation for thermally developing forced convection in a porous medium bounded by two isothermal parallel plates is investigated analytically on the basis of the Darcy flow model where the viscous dissipation effects had also been taken into account. A parametric study showed that decreasing the group parameter and the Peclet number increases the entropy generation while for the Brinkman number the converse is true. Heatline visualization technique is applied with an emphasis on the Br 〈 0 case where there is somewhere that heat transfer changes direction at some streamwise location to the wall instead of its original direction, i.e., from the wall.

关键词： entropy generation porous media heatline energy flux vectors forced convection

EFFECTS OF VISCOUS DISSIPATION ON THERMALLY DEVELOPING forced convection IN A POROUS SATURATED CIRCULAR TUBE WITH AN ISOFLUX WALL

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Applied Mathematics and Mechanics(English Edition) 2006年第5期27卷 617-626页

作者： Kamel Hooman Alireza Pourshaghaghy Arash Ejlali Mechanical Engineering Department Bushehr Engineering FacultyPersian Gulf UniversityBushehrIran Mechanical Engineering Department Faculty of EngineeringUniversity of TehranTehranIran Legal and Contracts Petropars Co.TehranIran

The viscous dissipation effect on forced convection in a porous saturated circular tube with an isoflux wall is investigated on the basis of the Brinkman flow model. For the thermally developing region, a numerical study is reported while a perturbation analysis is presented to find expressions for the temperature profile and the Nusselt number for the fully developed region. The fully developed Nusselt number found by numerical solution for the developing region is compared with that of asymptotic analysis and a good degree of agreement is observed.

关键词： forced convection viscous dissipation Brinkman model Darcy number Nusselt number

Study of forced convection Heat Transfer of Supercritical CO_(2) in a Horizontal Channel by Lattice Boltzmann Method

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Advances in Applied Mathematics and Mechanics 2010年第5期2卷 564-572页

作者： Xiaodong Niu Hiroshi Yamaguchi Yuhiro Iwamoto Xinrong Zhang Mingjun Li Yuhiro Iwamoto Department of Mechanical Engineering Doshisha UniversityKyo-Tanabe-ShiKyoto 610-0321Japan Department of Energy and Resources Engineering College of EngineeringPeking UniversityBeijing 100871P.R.China Department of Mechanical Engineering Xiangtan UniversityHunan 411105P.R.China

The problem of forced convection heat transfer of supercritical CO_(2) in a horizontal channel is investigated numerically by a lattice Boltzmann *** study is stimulated by our recent experimental findings on solar collectors using supercritical CO_(2) as a working fluid,which can achieve the collector efficiency high up to 70%.To deeply understand the heat transfer characteristics of supercritical CO_(2) and provide a theoretical guidance for improving our current experimental system,in present study several typical experimental flow conditions are *** particular,the work focuses on the convective heat transfer characteristics of supercritical CO_(2) flowing in a horizontal channel with mediate Reynolds numbers ranging from 210 to 840 and constant heat fluxes from 400.0 to 800.0 W/m^(2).The simulations show that the heat transfer increases with heat flux and decreases with Reynolds ***,the mechanisms of heat transfer enhancement of supercritical CO_(2) fluid are identified.

关键词： forced convection supercritical CO_(2) lattice Boltzmann method

Effect of cooling rate and forced convection on as-cast structure of 2205 duplex stainless steel

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China Foundry 2015年第1期12卷 32-38页

作者： Cheng Zhang Hong-gang Zhong Cong-sen Wu Jie Ni Qi-jie Zhai Shanghai Key Laboratory of Modern Metallurgy & Materials Processing Shanghai University

To forecast the as-cast structure and ferrite-austenite phase ratio of 2205 duplex stainless steel(DSS), the effects of cooling rate and forced convection were observed in a high-vacuum resistance furnace in which the forced convection was created by the rotation of the crucible. The as-cast structure of all 2205 DSS samples is full equiaxed grains, and the microstructure consists of a great amount of desirable intra-granular austenite inside the continuous ferrite grain matrix, besides Widmanstatten austenite and grain boundary austenite. The ferrite grain size decreases gradually with the increase in the cooling rates(20 to 60 oC·min-1) or the forced convection, while the ferrite grains of the samples solidified with a strong convection are barely changed when the cooling rate is below 50 oC·min-1. Moreover, a small grain size is beneficial for the austenite formation but the influence is not very obvious under the cooling rates in the range of 5 to 50 oC·min-1. Compared with grain size, the cooling rate has a greater influence on the final ferrite content. A model based on the experimental results is established to predict the ferrite content, which could be approximated by δ(%) = 20.5·exp(c/80.0) + 0.34 d +34.1, where cis the cooling rate in oC·min-1 and d is the grain size in mm. By using this model, the dependence of the final ferrite content on cooling rate and grain size is well described.

关键词： duplex stainless steel cooling rate grain size forced convection ferrite content

Single-Phase forced convection Heat Transfer in Micro Rectangular Channels

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Chinese Journal of Aeronautics 2003年第1期16卷 7-11页

作者：赵增会余建祖 Faculty 505 Beijing University of Aeronautics and Astronautics Beijing 100083 China

Increase in the integration and package density of aviation electronic equipment provides severe challenge to heat control for electronic components, yet the microchannel radiator offers an efficient method for solving the problem of cooling electronic chips and devices. In this paper, 6 micro rectangle channels with different sizes were designed and fabricated; the experiment of single\|phase forced convection heat transfer was conducted with solution of CH\-5OH, the most commonly used coolant for aviation electronic equipment, flowing through those microchannels. The influences of liquid velocity, degree of coolant supercooling, and configuration of microchannels on the heat transfer characteristics were analyzed respectively.

关键词： microchannel forced convection heat transfer heat control