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首页> 外文期刊>Journal of Heat Transfer >Falling Film and Spray Evaporation Enhancement Using an Applied Electric Field
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Falling Film and Spray Evaporation Enhancement Using an Applied Electric Field

机译：使用外加电场增强降膜和喷雾蒸发

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摘要

The effect of an electric field on the falling-film evaporation of refrigerant R-134a on a vertical plate and three commercially available tubes was investigated experimentally. The plate test section was 25.4 mm wide and 76.2 mm long, and each tube test section was 19 mm in diameter and 140 mm long. Experiments were conducted in both falling film and spray evaporation modes. The effects of various parameters such as heat flux, refrigerant flow rate, electrode gap, and applied voltage were investigated. It was found that in the presence of an applied electric field, the maximum enhancement in the heat transfer coefficient for both falling film and spray evaporation modes on a plate was nearly the same. A maximum enhancement of fourfold in the heat transfer coefficient with the plate, 90 percent with the smooth tube, 110 percent with the Turbo BIII, and 30 percent with 19 fpi tube were obtained. The electrohydrodynamic power consumption in all cases was less than 0.2 percent of the total energy exchange rate in the test section.
机译：实验研究了电场对垂直板上的制冷剂R-134a和三个市售管的降膜蒸发的影响。平板测试部分的宽度为25.4mm，长为76.2mm，每个试管测试部分的直径为19mm，长为140mm。在降膜和喷雾蒸发模式下均进行了实验。研究了诸如热通量，制冷剂流量，电极间隙和施加电压等各种参数的影响。已经发现，在施加电场的情况下，在板上的降膜模式和喷雾蒸发模式下，传热系数的最大增强几乎相同。板的传热系数最大提高了四倍，光滑管提高了90％，Turbo BIII提高了110％，19 fpi管提高了30％。在所有情况下，电动流体动力消耗均小于测试部分总能量交换率的0.2％。

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