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Appropriate position of porous insert in a heat exchanger by thermohydraulic analysis

机译：通过热工水力分析确定多孔插入物在热交换器中的适当位置

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摘要

This paper presents numerically an appropriate position of a porous insert to get a better thermohydraulic performance from a porous heat exchanger. The simulation is based on the Darcy-Brinkman-Forchheimer model in the porous field. Two-dimensional continuity, momentum, and energy equations with incompressible, laminar, steady assumptions have been solved using a finite volume approach. The analysis is performed for different values of porous layer thickness, length, and porosity at a fixed value of Reynolds number (Re = 100) and thermal conductivity ratio (Rc = 5). The results showed that there is about a 48% and 13% reduction in pressure drop and Nusselt number, respectively, by decreasing horizontal porous substrate thickness from 1 to 1/2 for δ_v = 1/3 at ε = 0.7. As a result, the pressure drop reduces considerably with a reasonable reduction in heat transfer rate by decreasing horizontal porous substrate thickness from 1 to 1/2.
机译：本文从数值上给出了多孔插入物的合适位置，以从多孔热交换器获得更好的热工性能。该模拟基于多孔场中的Darcy-Brinkman-Forchheimer模型。具有不可压缩，层流，稳定假设的二维连续性，动量和能量方程已使用有限体积方法求解。在固定的雷诺数（Re = 100）和导热系数（Rc = 5）的情况下，对多孔层厚度，长度和孔隙率的不同值进行分析。结果表明，对于ε= 0.7的δ_v= 1/3，通过将水平多孔基质厚度从1减小为1/2，压降和Nusselt数分别减少了48％和13％。结果，通过将水平多孔基板的厚度从1减小到1/2，在合理地降低热传递率的情况下，压降大大降低。

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