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EHD-Enhanced External Condensation of R-134a on Enhanced Tubes

机译：EHD增强管上R-134a的外部冷凝

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摘要

The enhancement of condensation heat transfer is of practical importance in many industries such as HVAC, power, and aerospace. The present work is concerned with the electrohydrodynamic (EHD) enhancement of external condensation on single commercial enhanced lubes. The experiments were performed on two types of enhanced tubes. The refrigerant was R-134a, with the EHD voltage in the range 0 to 25 kV, saturation temperature 10 to 40℃, and heat flux 10 to 40 kW/(m~2K). The results indicated that the external heat transfer coefficient significantly increased under the effect of electric field. The optimum heat transfer enhancement was approximately 3-fold for either tube, with respective EHD power consumption lower than 1% of the test section heat transfer rate. Also investigated in this work is the effect of polarity on external condensation. The results for the negative polarity indicated that the heat transfer coefficient was much less affected by the electric field than the positive polarity. The maximum enhancement obtained with the negative polarity was 1.5 fold, compared to a maximum enhancement of 3.7 fold when a positive polarity was used. The measurements indicated that the EHD power consumption was also higher for the positive polarity.
机译：在诸如HVAC，电力和航空航天等许多行业中，冷凝水传热的增强具有实际意义。目前的工作是关于在单个商业增强型润滑油上的外部冷凝的电流体力学（EHD）增强。在两种类型的增强管上进行了实验。制冷剂为R-134a，EHD电压范围为0至25 kV，饱和温度为10至40℃，热通量为10至40 kW /（m〜2K）。结果表明，在电场作用下，外部传热系数显着增加。每个管的最佳传热增​​强约为3倍，相应的EHD功耗低于测试段传热率的1％。在这项工作中还研究了极性对外部冷凝的影响。负极性的结果表明，传热系数受电场影响的程度比正极性小得多。负极性获得的最大增强为1.5倍，而正极性获得的最大增强为3.7倍。测量结果表明，正极性的EHD功耗也更高。

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