首页> 外文期刊>International Journal of Heat and Mass Transfer >Improved flow pattern map for accurate prediction of the heat transfer coefficients during condensation of R-134a in smooth horizontal tubes and within the low-mass flux range
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Improved flow pattern map for accurate prediction of the heat transfer coefficients during condensation of R-134a in smooth horizontal tubes and within the low-mass flux range

机译:改进的流型图,可准确预测R-134a在光滑水平管中和低质量通量范围内冷凝期间的传热系数

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This paper presents an improved flow pattern map for predicting the heat transfer coefficients during condensation of R-134a inside a smooth horizontal tube. Experimental tests were conducted over the low-mass flux range of 75-300 kg/m~2 s, at a nominal saturation temperature of 40 ℃ and with the test section vapour qualities ranging from 0.76 down to 0.03. This represents points within the annular, intermittent and stratified flow regimes. The results were used to modify the Thome-EI Hajal flow pattern map to include a transition region between the stratified-wavy and annular or intermittent flow regimes. The revised flow pattern-based heat transfer correlation predicted the experimental data to a mean deviation of less than 6%.
机译:本文提出了一种改进的流型图,用于预测R-134a在光滑水平管内冷凝过程中的传热系数。在75-300 kg / m〜2 s的低质量通量范围内,在40℃的标称饱和温度下进行了实验测试,测试部分的蒸气质量范围为0.76至0.03。这代表了环形,间歇性和分层流态中的点。结果用于修改Thome-EI Hajal流型图,以包括分层波浪型和环形或间歇流型之间的过渡区域。修改后的基于流型的传热相关性将实验数据预测为平均偏差小于6%。

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