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首页> 外文期刊>JSME International Journal. Series B, Fluids and Thermal Engineering >An Experimental Investigation of Pressure Drop in Flow Boiling of Pure Refrigerants and Their Mixture in Horizontal Tube
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An Experimental Investigation of Pressure Drop in Flow Boiling of Pure Refrigerants and Their Mixture in Horizontal Tube

机译：纯制冷剂及其在水平管中的混合物沸腾时压降的实验研究

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摘要

Experimental investigation of pressure drop for pure refrigerants R134a and R123 and their mixtures as test fluids was carried out for both an adiabatic and a diabatic two-phase flow in a horizontal tube. The measured frictional pressure drop in the adiabatic experiments increased in the S -shaped curve as equilibrium vapor quality was increased. These data were compared to various correlations proposed in the past for the frictional pressure drop. The homogeneous model considerally underpredicted the present data both for pure fluids and their mixtures in the entire mass flux range 150 to 600 kg/m{sup}2s covered in the measurements, while Friedel correlation was found rather well to correlate the frictional pressure drop data among compared correlations. However a detailed examination showed Friedel correlation underpredicted the present data in the stratified and stratified-wavy flow regions at low vapor quality and overpredicted in the annular flow region at high quality. A new two-phase multiplier was developed from a dimensional analysis of the frictional pressure drop data measured in the adiabatic experiment. This new multiplier was found successfully to correlate the frictional pressure drop measured in the diabatic flow boiling experiments of pure refrigerants and their mixtures almost with a mean deviation of 20%.
机译：对于水平管中的绝热和绝热两相流，对纯制冷剂R134a和R123及其混合物作为测试流体的压降进行了实验研究。绝热实验中测得的摩擦压降随着平衡蒸气质量的提高而呈S形曲线增加。将这些数据与过去针对摩擦压降提出的各种相关性进行了比较。均质模型对测量中涵盖的整个质量通量范围为150至600 kg / m {sup} 2s的纯流体及其混合物的当前数据均估计不足，而弗里德尔相关性很好地与摩擦压降数据相关在比较的相关性之间。但是，详细检查表明，弗里德尔相关性在低蒸汽质量下对分层和分层波浪流动区域中的当前数据预测不足，而在环形流体区域中对高质量的预测过高。通过在绝热实验中测量的摩擦压降数据的尺寸分析，开发了一种新的两相乘数。已经发现，这个新的乘数成功地将纯制冷剂及其混合物的绝热流沸腾实验中测得的摩擦压降与平均偏差几乎相关联了20％。

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