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首页> 外文期刊>International Journal of Heat Exchangers >Thermal performance of the first construct of a constructal heat exchanger with developing laminar flow
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Thermal performance of the first construct of a constructal heat exchanger with developing laminar flow

机译：层流不断发展的结构热交换器的第一个结构的热性能

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摘要

Numerical simulation is carried out for heat transfer and fluid flow for the first construct of a constructal heat exchanger for water and air as operating fluids. For operations with air, straight fins are used to enhance thermal conductance. Even though the flow is laminar, the heat transfer coefficient is high due to two reasons: first, flow is thermally developing and second, increased compactness due to small hydraulic diameter. These results were compared with heat exchangers with fully developed flow. It was found that the effectiveness, for the flow rates considered, was 4% (at higher flow rates) to 10% (at lower flow rates) greater than that of fully developed cross flow heat exchanger. This result is very much encouraging due to the fact that in presence of three dimensionality of flow and maldistribution, the effectiveness is expected to be lower than the fully developed cross flow heat exchanger. The present results indicate that the effectiveness for the second construct which will be an assembly of first constructs is expected to be still higher due to increase in the interfacial area.
机译：对于水和空气作为工作流体的结构热交换器的第一个结构，对传热和流体流动进行了数值模拟。对于有空气的操作，使用直翅片来增强导热性。即使流动是层流的，由于两个原因，传热系数也很高：首先，流动是热发展的；其次，由于水力直径小，致密性增加。将这些结果与流量充分发展的热交换器进行了比较。已经发现，对于所考虑的流量，其效率比完全开发的错流热交换器的效率高4％（在较高的流量下）至10％（在较低的流量下）。由于存在三维流动和分布不均的事实，因此该结果非常令人鼓舞，预计其效率将低于完全开发的错流热交换器。目前的结果表明，由于界面面积的增加，预期将作为第一构建体的组装体的第二构建体的有效性仍然更高。

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