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首页> 外文期刊>International Journal of Heat and Mass Transfer >The influence of flow maldistribution on the performance of inhomogeneous parallel plate heat exchangers
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The influence of flow maldistribution on the performance of inhomogeneous parallel plate heat exchangers

机译：流量分布不均对不均匀平行板式换热器性能的影响

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摘要

The heat transfer performance of inhomogeneous parallel plate heat exchangers in transient operation is investigated using an established model. A performance parameter, denoted the Nusselt-scaling factor, is used as benchmark and calculated using a well-established single blow technique. A sample of 50 random stacks having equal average channel thicknesses with 20 channels each are used to provide a statistical base. The standard deviation of the stacks is varied as are the flow rate (Reynolds number) and the thermal conductivity of the solid heat exchanger material. It is found that the heat transfer performance of inhomogeneous stacks of parallel plates may be reduced significantly due to the maldistribution of the fluid flow compared to the ideal homogeneous case. The individual channels experience different flow velocities and this further induces an inter-channel thermal cross talk.
机译：利用建立的模型研究了非均质平行板换热器在瞬态运行中的传热性能。表示为Nusselt缩放因子的性能参数用作基准，并使用公认的单打击技术进行计算。 50个随机堆栈的样本均具有相等的平均通道厚度（每个通道具有20个通道）用于提供统计基础。烟囱的标准偏差随固体热交换器材料的流量（雷诺数）和热导率而变化。已经发现，与理想的均质情况相比，由于流体流的分配不均，平行板的不均质堆叠的传热性能可能会大大降低。各个通道的流速不同，这进一步引起通道间的热串扰。

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