Flow boiling heat transfer of R134a and R245fa in a 2.3 mm tube.
Flow boiling heat transfer of R134a and R245fa in a 2.3 mm tube.
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DOI：
10.1016/j.ijheatmasstransfer.2010.01.038
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发表时间：
2010-05
影响因子：
5.2
通讯作者：
C. Tibiriçá;G. Ribatski
中科院分区：
文献类型：
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作者：
C. Tibiriçá;G. Ribatski
本文介绍了微尺度管内流动沸腾换热的新实验结果。实验数据是在2.3mm内径的水平孔中获得的。加热长度为464 mm的不锈钢管，R134a和R245fa作为工作流体，质量速度范围为50至700 kgm −2s−1，热通量范围为5至55 kWm −2，出口饱和温度为22、31和41°C，蒸汽质量范围为0.05至0.99。流型特征也进行了高速拍摄获得的图像。测量了从1到14kWm−2K− 1的传热系数结果。结果表明，换热系数是热流密度、质量流速和干度的函数。将实验数据与文献中的十种流动沸腾预测方法进行了比较。Liu和温特顿[3]，Zhang等. [5]和Saitoh等人[6]对这两种流体的效果最好，捕获了大多数实验传热趋势。
This paper presents new experimental flow boiling heat transfer results in micro-scale tubes. The experimental data were obtained in a horizontal 2.3mm I.D. stainless steel tube with heating length of 464mm, R134a and R245fa as working fluids, mass velocities ranging from 50 to 700kgm−2s−1, heat flux from 5 to 55kWm−2, exit saturation temperatures of 22, 31 and 41°C, and vapor qualities ranging from 0.05 to 0.99. Flow pattern characterization was also performed from images obtained by high-speed filming. Heat transfer coefficient results from 1 to 14kWm−2K−1were measured. It was found that the heat transfer coefficient is a strong function of heat flux, mass velocity and vapor quality. The experimental data were compared against ten flow boiling predictive methods from the literature. Liu and Winterton [3], Zhang et al.[5] and Saitoh et al. [6] worked best for both fluids, capturing most of the experimental heat transfer trends.