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层流流动下微通道的数值模拟

发表时间:2009-04-30  浏览量:1596  下载量:772
全部作者: 陈彬彬,刘志春,刘伟
作者单位: 华中科技大学能源与动力工程学院
摘 要: 利用软件Gambit建立了微通道换热器的三维流动与传热模型,用Fluent软件进行三维流场、温度场的分析与仿真。通过对一系列尺寸矩形微通道进行分析比较,得到矩形微通道基础性的传热与流动特征数据。随着雷诺数(Re)的增加,温度边界层减薄,努赛尔数(Nu)增大,摩擦阻力系数减小;矩形微通道的设计中,通道占空比对换热性能有较大影响。以换热系数进行比较,当占空比为83%左右时,热沉表面温度最低,换热性能最佳;当间距恒定不变而占空比不同时,会出现两个换热性能较好的情况,主要是由于换热表面积和肋片厚度影响换热性能的程度不同。
关 键 词: 工程热物理;微通道;数值模拟;换热性能;占空比
Title: Numerical simulation of flow and heat transfer in microchannel at the laminar flow
Author: CHEN Binbin, LIU Zhichun, LIU Wei
Organization: School of Energy and Power Engineering, Huazhong University of Science and Technology
Abstract: A 3D heat transfer and fluid flow model of a microchannel heat exchanger was constructed according to Gambit software, and simulation of 3D flow and temperature fields was also carried out by Fluent software. The thermal performances of a series of microchannels with different dimensions were analyzed, and experimental data of thermal and resistance performances of partial rectangle microchannels were validated. As the Reynold number increased,the thermal boundary layer thickness and the friction resistance coefficient decreased, while the Nusselt number increased.In the design of the rectangle microchannel, duty ratio of rib thickness to channel width affected the heat transfer performance greatly. Taking the heat transfer coefficient as comparison standard, when the duty ratio was 83%, the heat exchanger surface temperature was the lowest and the thermal performance was the best. With a constant space and different duty ratios, two conditions with high heat transfer performances emerged mainly due to the different degrees of influence of the heat transfer surface area and the rib thickness on the heat exchange performance.
Key words: engineering thermophysics; microchannel; numerical simulation; heat transfer performance; duty ratio
发表期数: 2009年4月第8期
引用格式: 陈彬彬,刘志春,刘伟. 层流流动下微通道的数值模拟[J]. 中国科技论文在线精品论文,2009,2(8):775-781.
 
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