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首页> 外文期刊>Journal of Heat Transfer >Flow Boiling of R134a in Circular Microtubes—Part II: Study of Critical Heat Flux Condition
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Flow Boiling of R134a in Circular Microtubes—Part II: Study of Critical Heat Flux Condition

机译：R134a在圆形微管中的流动沸腾—第二部分：临界热通量条件的研究

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A detailed experimental study was carried out on the critical heat flux (CHF) condition for flow boiling of R 134a in single circular microtubes. The test sections had inner diameters (ID) of 0.50 mm, 0.96 mm, and 1.60 mm. Experiments were conducted over a large range of mass flux, inlet subcooling, saturation pressure, and vapor quality. CHF occurred under saturated conditions at high qualities and increased with increasing mass fluxes, tube diameters, and inlet subcoolings. CHF generally, but not always, decreases with increasing saturation pressures and vapor qualities. The experimental data were mapped to the flow pattern maps developed by Hasan [2005, "Two-Phase Flow Regime Transitions in Microchannels: A Comparative Experimental Study," Nanoscale Micro-scale Thermophys. Eng., 9, pp. 165-182] and Revellin and Thome [2007, "A New Type of Diabatic Flow Pattern Map for Boiling Heat Transfer in Microchannels," J. Micro-mech. Microeng., 17, pp. 788-796]. Based on these maps, CHF mainly occurred in the annular flow regime in the larger tubes. The flow pattern for the 0.50 mm ID tube was not conclusively identified. Four correlations—the Bowring correlation, the Katto-Ohno correlation, the Thome correlation, and the Zhang correlation—were used to predict the experimental data. The correlations predicted the correct experimental trend, but the mean absolute error (MAE) was high (>15%) A new correlation was developed to fit the experimental data with a MAE of 10%.
机译：在R 134a在单个圆形微管中进行沸腾的临界热通量（CHF）条件下进行了详细的实验研究。测试部分具有0.50mm，0.96mm和1.60mm的内径（ID）。在大范围的质量通量，入口过冷，饱和压力和蒸气质量上进行了实验。 CHF发生在高质量的饱和条件下，并随着质量通量，管径和入口过冷度的增加而增加。 CHF通常但并非总是随饱和压力和蒸汽质量的增加而降低。将实验数据映射到由Hasan [2005年，“微通道中的两相流态转变：比较实验研究”，纳米级微型热物理学报》开发的流型图。 Eng。，9，pp。165-182]和Revellin and Thome [2007，“一种用于微通道沸腾传热的新型绝热流型图”，J. Micro-mech。 [Microeng。，17，第788-796页]。根据这些图，CHF主要出现在较大管的环形流态中。不能最终确定0.50 mm内径管的流型。四个相关性-Bowring相关性，Katto-Ohno相关性，Thome相关性和Zhang相关性-用于预测实验数据。相关性预测了正确的实验趋势，但是平均绝对误差（MAE）高（> 15％）。开发了一种新的相关性以拟合10％MAE的实验数据。

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