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首页> 外文期刊>International Journal of Heat Exchangers >Enhancement of Nucleate Pool Boiling Heat Transfer by Reentrant Cavity Horizontal Tubes
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Enhancement of Nucleate Pool Boiling Heat Transfer by Reentrant Cavity Horizontal Tubes

机译：凹腔水平管增强核池沸腾传热

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摘要

An experimental investigation has been carried out for the pool boiling of acetone, iso-propanol, ethanol and water, at atmospheric pressure, on single horizontal reentrant cavity (REC) tubes of brass. The outer diameter and length of each tube are 33 mm and 218 mm, respectively. The reentrant cavity mouth size has been varied systematically as 0.5, 0.4, 0.3, 0.25 and 0.2 mm. The optimum cavity mouth size for isopropanol and acetone has been found to be 0.25 mm. However, for ethanol and water the highest heat transfer coefficient is for the cavity mouth size of 0.2 mm. For all the working fluids, the heat flux varied from 11 kW/m~2 to 42 kW/m~2 in five steps. The boiling heat transfer coefficient, h, has been found to increase with the rise in heat flux and it has lowered with the reduction in cavity mouth size. A correlation has also been developed, which predicts the boiling heat transfer coefficient, h, as a function of heat flux and the cavity mouth size. This correlation calculates the heat transfer coefficient in an error band of +-15 percent.
机译：已经进行了一项实验研究，用于在大气压下在黄铜的单个水平凹腔（REC）管上对丙酮，异丙醇，乙醇和水进行池沸腾。每个管的外径和长度分别为33 mm和218 mm。凹腔口的大小已系统地变化为0.5、0.4、0.3、0.25和0.2 mm。发现异丙醇和丙酮的最佳腔口尺寸为0.25毫米。但是，对于乙醇和水，最大的传热系数是0.2 mm的腔口尺寸。对于所有工作流体，热通量从11 kW / m〜2到42 kW / m〜2分五步变化。已经发现沸腾传热系数h随着热通量的增加而增加，并且随着腔口尺寸的减小而降低。还开发了一种相关性，该相关性预测了沸腾传热系数h作为热通量和型腔口径的函数。这种相关性可计算出误差范围为+ -15％的传热系数。

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