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首页> 外文期刊>International journal of numerical methods for heat & fluid flow >Numerical investigation on the performance of cross-flow micro heat exchangers
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Numerical investigation on the performance of cross-flow micro heat exchangers

机译：错流微型换热器性能的数值研究

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Purpose - The purpose of this paper is twofold: to describe a relevant improvement to an in-house FEM procedure for the heat transfer analysis of cross-flow micro heat exchangers and to study the influence of microchannel cross-sectional geometry and solid wall thermal conductivity on the thermal performance of these microdevices. Design/methodology/approach - The velocity field in each microchannel is calculated separately. Then the energy equation is solved in the whole computational domain. Domain decomposition and grids that do not match at the common interface are employed to make meshing more effective. Some flow maldistribution effects are taken into account. Findings - The results show that larger thermal conductivities of the solid walls and rectangular cross-sectional geometries with higher aspect ratios allow the maximization of the total heat flow rate in the device. However, on the basis of the heat transfer per unit pumping power, the square cross-section could be the best option. Research limitations/implications - The value of the average viscosity is assumed to be different in different microchannels, but constant within each of the microchannels. Practical implications - The procedure can represent a valuable tool for the design of cross-flow micro heat exchangers. Originality/value - In spite of requiring limited computational resources, the improved procedure can take into account flow maldistribution effects stemming from non-uniform microchannel temperatures.
机译：目的-本文的目的是双重的：描述对内部流动有限元程序进行横流式微型热交换器传热分析的相关改进，并研究微通道横截面几何形状和固体壁热导率的影响这些微型设备的热性能。设计/方法/方法-每个微通道中的速度场分别计算。然后，在整个计算域中求解能量方程。使用域分解和在公共接口处不匹配的网格来使网格划分更加有效。考虑了一些流量分配不均的影响。发现-结果表明，实心壁的较大导热率和具有较高纵横比的矩形横截面几何形状可以使设备中的总热流率最大化。但是，根据每单位泵送功率的热传递，正方形横截面可能是最佳选择。研究的局限性/意义-假设平均粘度的值在不同的微通道中不同，但在每个微通道中均保持不变。实际意义-该程序可以代表设计错流微型热交换器的宝贵工具。原创性/价值-尽管需要有限的计算资源，但改进的过程可以考虑到由于微通道温度不均匀而造成的流量分配不均的影响。

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