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首页> 外文期刊>Heat Transfer Research >THERMOHYDRAULIC PERFORMANCE OF A CHANNEL EMPLOYING WAVY POROUS SCREENS
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THERMOHYDRAULIC PERFORMANCE OF A CHANNEL EMPLOYING WAVY POROUS SCREENS

机译：采用波浪多孔屏的沟道的热液性能

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摘要

Porous inserts are commonly employed in the heat exchanger channels to enhance the thermal performance. The present experimental investigations measure the pressure drop and heat transfer in a rectangular channel that employs a sinusoidally shaped porous screen mesh as inserts. Four screens with different forms of sinusoidal wave are employed: 68% porosity-12-mm period, 48% porosity-12-mm period, 68% porosity-18-mm period, and 48% porosity-18-mm period. The peak-to-peak height of the wave is 5 mm and touches the channel walls along the wave vectors that are parallel to the mean flow. Measurements in the smooth channel are used to normalize the friction factors and Nusselt numbers in the screen channel and provide the enhancements of friction factors f/f(0) and Nusselt numbers Nu/Nu(0) due to the screens. The Reynolds number Re based on the channel hydraulic diameter varies between 400 and 11,000. The results indicate that the friction factor f, average Nusselt number Nu, Nu/Nu(0), and f/f(0) in the screen channel depend strongly on Re. The screen porosity and wave period effects are significant on the f and f/f(0) only. The thermal performance index, (Nu/Nu(0))/(f/f(0))((1/3)), is also influenced strongly by Re. The present results thus indicate the viability of the wavy porous inserts for heat exchangers.
机译：多孔插入件通常用于热交换器通道中以增强热性能。本实验研究测量矩形通道中的压降和传热，其采用正弦状多孔筛网作为插入物。使用具有不同形式的正弦波的四个屏幕：68％孔隙率-12mm，48％孔隙率-12mm周期，68％孔隙率-18mm，和48％孔隙率-18mm。波的峰值到峰值高度为5mm，沿着与平均流量平行的波矢量触摸通道壁。平滑通道中的测量用于在屏幕通道中归一化摩擦因子和篮区的篮板，并由于屏幕而提供摩擦因子F / F（0）和NUSERET号NU / NU（0）的增强。基于通道液压直径的雷诺数Re在400和11,000之间变化。结果表明，屏幕通道中的摩擦因子F，平均NUSERET号NU，NU / NU（0）和F / F（0）在RE上依赖于RE。屏幕孔隙率和波周期效应仅在F和F / F（0）上是显着的。热性能指标（Nu / Nu（0））/（F / F（0））（（1/3））也受重新影响的强烈影响。因此，本结果表明了热交换器的波浪多孔插件的可行性。

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