Adiabatic two-phase flow pressure drop of R134a have been investigated experimentally in a rectangular channel with hydraulic diameter of 0.14 mm. Single-phase flow experiments were also conducted with liquid and vapor R134a, and an empirical correlation was developed for the turbulent flow regime. The parameter ranges examined for two-phase flow are: mass flux from 158 to 785 kg m{sup}(-2) s{sup}(-1); vapor quality from 0.01 to 0.95; and saturation temperature at about 24 ～ 32 °C. The experimental data were compared with twelve existing correlations. The homogeneous model and the Mishima and Hibiki (1996) correlation give better predictions than any other correlations.
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机译：R134a的绝热两相流量压降已经在实验中在矩形通道中进行研究，液压直径为0.14mm。用液体和蒸汽R134A进行单相流程实验，为湍流状态开发了经验相关性。为两相流检查的参数范围是：来自158至785 kg m {sup}（ - 2）s {sup}（ - 1）的质量通量;蒸汽质量从0.01到0.95;和饱和温度约24〜32℃。将实验数据与十二个现有相关性进行了比较。同质模型和Mishima和Hibiki（1996）相关性提供比任何其他相关性更好的预测。
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