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首页> 外文期刊>Journal of Mechanical Science and Technology >A comparison of the effect of the electrohydrodynamic technique on the condensation heat transfer of HFC-134a inside smooth and micro-fin tubes
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A comparison of the effect of the electrohydrodynamic technique on the condensation heat transfer of HFC-134a inside smooth and micro-fin tubes

机译：电动流体动力学技术对光滑和微翅片管内HFC-134a冷凝水传热效果的比较

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摘要

The results of the condensation heat transfer enhancement and pressure drop of HFC-134a by using the electrohydrodynamic (EHD) technique are presented. The test section is a horizontal tube-in-tube heat exchanger where the refrigerant flows in the inner tube and water flows in the annulus. The outer tube is a smooth copper tube having outer diameter of 21.2 mm. Two types of inner tubes, smooth and micro-fin copper tubes, are tested. The outer diameter and length of both inner tubes is 9.52 mm and 2.5 m, respectively. A stainless steel cylindrical electrode of 1.47 mm in diameter is placed in the center of the tube. Experiments are conducted under conditions providing mass flux of 400 kg/m{sup}2s, saturated temperature of 40 °C, heat flux of 20 kW/m{sup}2 and applied voltage of 2.5 kV. The experimental results indicate that the EHD enhancements of the smooth tube are higher than those of the micro-fin tube over the range of average quality. The maximum heat transfer enhancements for smooth and micro-fin tubes are 1.1 times and 1.08 times, respectively. For a smooth tube, the pressure drop induced by EHD is considerably small. However, the application of EHD in a micro-fin tube can lead to 10% increase in the pressure drop.
机译：提出了利用电液动力学（EHD）技术提高HFC-134a冷凝水传热和压降的结果。测试部分是卧式管式热交换器，制冷剂在内管中流动，水在环空中流动。外管是具有21.2mm外径的光滑铜管。测试了两种类型的内管，即光滑铜管和微翅片铜管。两个内管的外径和长度分别为9.52 mm和2.5 m。将直径为1.47毫米的不锈钢圆柱电极放置在管的中心。在提供400 kg / m 2的质量通量，40°C的饱和温度，20 kW / m 2的热通量和2.5 kV施加电压的条件下进行实验。实验结果表明，在平均质量范围内，光滑管的EHD增强高于微翅片管的EHD增强。光滑和微翅片管的最大传热增强分别为1.1倍和1.08倍。对于光滑的管子，由EHD引起的压降相当小。但是，在微翅片管中应用EHD可能导致压降增加10％。

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