基于结构优化的矩形微通道换热特性分析

Analysis of Thermal Characteristics of Rectangular Microchannel Heat Exchange Based on Structural Optimization

本文采用了数值模拟的方法,研究了微通道换热器结构对其内部流动与换热性能的影响,分析了不同宽高比C矩形微通道内流动与换热特性的变化,在其内部加微结构并分析微结构对换热器热性能的影响。结果表明:矩形微通道在宽高比C=1.00与宽高比C=2.00时微通道整体换热性能分别呈现出最差与最优,换热性能相差约31.5%,综合性能相差约23.6%;在宽高比C=2.00的矩形通道内表面添加微结构之后,微结构引起流道内局部扰动破坏边界层强化了流体混合的同时增强了换热,流速较小时增强效果较明显,换热最大可提高2.88倍,但伴随着巨大的压降,最大达到97.3%。

In this paper,the method of numerical simulation is used to study the influence of the structure of the microchannel heat exchanger on its internal flow and heat transfer performance.The flow and heat transfer characteristics in the rectangular micro-channel with different width to height ratios is analyzed.And the microstructure is added internally and the effect of microstructure on the thermal performance of the heat exchanger is analyzed.The results show that the overall heat transfer performance of the rectangular microchannel is the worst and the best when the aspect ratio C=1.00 and the aspect ratio C=2.00,respectively,their thermal performance of the rectangular microchannel differs by about 31.5%and the comprehensive performance by about 23.6%.After adding microstructures to the inner surface of the rectangular channel with aspect ratio C=2.00,the microstructures cause local disturbances in the flow channel which destroy the boundary layer and enhance fluid mixing while enhancing heat transfer,The enhancement is more obvious when the flow rate is small which can be increased by 2.88 times,but with a huge pressure drop,the maximum is up to 97.3%.