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首页> 外文期刊>International Journal of Heat and Mass Transfer >Heat transfer and pressure drop of R32 evaporating in one pass microchannel tube with parallel channels
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Heat transfer and pressure drop of R32 evaporating in one pass microchannel tube with parallel channels

机译：R32在具有平行通道的单程微通道管中蒸发的传热和压降

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摘要

This paper presents heat transfer coefficient and pressure drop of R32 measured in the same facility as introduced in Li and Hrnjak (2017). Experiments are conducted on a 24-port microchannel tube with a hydraulic diameter of 0.643 mm. The pressure drop of R32 is lower than R134a, and the heat transfer coefficient is higher at the same condition. The pressure drop increases with quality and mass flux but decreases with reduction of saturation pressure. R32 heat transfer coefficient increases when heat or mass flux rises. Heat transfer coefficient of R32 first increases when quality increases due to convective effects and then drops at moderate quality due to the absence of nucleate boiling and dry-out. A comparison of adiabatic pressure drop and heat transfer coefficient to correlations has been made. Based on the Blasius equation and homogeneous density, the viscosity model from Cicchitti et al. (1960) has the best fit to predict two-phase pressure drop. Kim and Mudawar (2012) has the smallest MAE to predict pressure drop. For heat transfer coefficient, Sun and Mishima (2009) is the best fit. Further research will be on expanding the database and understanding hydraulic and boiling behavior. (C) 2018 Elsevier Ltd. All rights reserved.
机译：本文介绍了在Li和Hrnjak（2017）中介绍的同一设施中测得的R32的传热系数和压降。在液压直径为0.643毫米的24端口微通道管上进行实验。在相同条件下，R32的压降低于R134a，传热系数较高。压降随质量和质量通量的增加而增加，但随饱和压力的降低而减小。当热量或质量通量增加时，R32的传热系数增加。由于对流作用，当质量增加时，R32的传热系数首先增加，然后由于不发生核沸腾和变干而以中等质量下降。将绝热压降和传热系数与相关性进行了比较。基于Blasius方程和均质密度，Cicchitti等人的粘度模型。 （1960）最适合预测两相压降。 Kim and Mudawar（2012）用最小的MAE来预测压力下降。对于传热系数，Sun和Mishima（2009）是最合适的。进一步的研究将在扩展数据库和理解水力和沸腾行为方面。 （C）2018 Elsevier Ltd.保留所有权利。

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