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首页> 外文期刊>International Journal of Heat and Mass Transfer >Numerical analysis of electric force influence on heat transfer in a channel flow (theory based on saturated porous medium approach)
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Numerical analysis of electric force influence on heat transfer in a channel flow (theory based on saturated porous medium approach)

机译：力对通道流传热影响的数值分析（基于饱和多孔介质方法的理论）

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摘要

The present paper reports the influence of electrode and ground arrangement on electrically-driven airflow and heat transfer enhancement in a saturated porous medium placed in a channel flow. In simulations, the inlet velocity and temperature of air entering a test section are controlled at 0.35 m/s and 60 ℃, respectively. High electrical voltage is tested in the range of 0-30 kV. The numerical results show+ that when electric field is applied, swirling flow caused by shear flow effect is observed. When electrode is placed near ground, swirling flow is small but it has a high strength. In addition, the strength of swirling flow is increased by increasing electrical voltage. With occurrence of swirling flow, the heat transfer is totally higher than the case of conventional hot-airflow. By comparing with a single ground, swirling flow created by multiple ground effect spreads wider over the surface of sample. This causes temperature of the sample to increase faster. It is found from flow visualization that behaviors of swirling flow obtained by smoke incense technique and simulation have a good agreement. Furthermore, enhancement of heat transfer in the sample depended on the arrangement of electrode and ground, as well as, the position of the sample.
机译：本文报道了放置在通道流中的饱和多孔介质中，电极和接地布置对电动气流和传热增强的影响。在模拟中，进入测试区域的空气的入口速度和温度分别控制在0.35 m / s和60℃。在0-30 kV范围内测试了高电压。数值结果表明，+施加电场时，观察到由剪切流效应引起的旋流。当电极靠近地面放置时，旋流很小，但强度很高。另外，通过增加电压来增加旋流的强度。在发生涡流的情况下，传热完全高于常规热气流的情况。通过与单个地面进行比较，由多个地面效应产生的旋流会在样品表面上更广泛地扩散。这导致样品的温度上升更快。从流动可视化发现，通过熏香技术和模拟获得的旋流行为具有良好的一致性。此外，样品中传热的增强取决于电极和接地的布置以及样品的位置。

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