Comparison of Numerical Simulation and Experimental Results for Crossflow and Counterflow Microchannel Heat Exchangers
Comparison of Numerical Simulation and Experimental Results for Crossflow and Counterflow Microchannel Heat Exchangers
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横流与逆流微通道换热器数值模拟与实验结果比较
DOI：
10.1115/icmm2004-2438
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
K. Schubert
中科院分区：
文献类型：
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作者：
A. Halbritter;U. Schygulla;A. Wenka;K. Schubert
在卡尔斯鲁厄研究中心的微过程工程研究所，微型热交换器是由基础金属合金的单箔制造的。微通道热交换器的热工水力特性的表征是在10°C和95°C的温度下在两个通道上使用水作为传热介质来完成的。本出版物将给出一个概述的数值模拟以及实验结果的横流和逆流微通道换热器。示出了具有不同微通道结构的三种错流换热器和两种不同类型的逆流微通道换热器的比较。为便于比较，给出了实验和理论计算得到的传热速率、总传热系数和效率以及压降。对于数值模拟，使用了两种模型。一种简单易懂的方法是使用基于Nusselt理论的经典工程规范（VDI Warmeatlas，1994）。一个更详细的模型是使用计算流体动力学（CFD）与商业上可用的工具FLUENT ®，其中最好的估计代码已被应用于数值模拟。这两个数值计算是一个有益的补充，以预测热和流体动力学行为的微通道换热器。版权所有© 2004年由ASME
At the Institute for Micro Process Engineering of the Forschungszentrum Karlsruhe, micro heat exchangers are manufactured out of single foils of base metal alloys. The characterisation of the thermohydraulic properties of microchannel heat exchangers is done using water as heat transfer medium on both passages at temperatures of 10°C and 95°C. The present publication will give an overview of the numerical simulation as well as experimental results for crossflow and counterflow microchannel heat exchangers. A comparison of three crossflow heat exchangers with different microchannel structures, and two different types of counterflow microchannel heat exchangers is shown. For comparison, the heat transfer rate, the overall heat transfer coefficients and efficiencies as well as pressure drop obtained from experiment and theory is shown. For numerical simulation, two models have been used. An easily accessibly method is to use classical engineering codes based on the Nusselt theory (VDI Warmeatlas, 1994). A more detailed model is to use computational fluid dynamics (CFD) with the commercially available tool FLUENT ®, where best estimation codes have been applied for numerical simulation. Both numerical calculations are a helpful complement to predict thermal and hydrodynamic behaviour of the microchannel heat exchangers.Copyright © 2004 by ASME