介绍了由试验数据求取毛细管内制冷剂自蒸发流动过程中局部摩阻压降、加速压降和总压降的方法;给出了干度和摩阻压降、加速压降及总压降沿毛细管的分布;指出干度和各压降沿毛细管的分布均呈非线性。因而,在流动特性的描述中仅用进、出口干度和压降或它们的进、出口的平均值来计算,会带来较大的误差,应考虑干度和各压降的局部变化规律。 A method to calculate the local friction pressure drop, the acceleration pressure drop and the total pressure drop during the self-evaporation of the refrigerant in the capillary by the experimental data is introduced. The dryness, frictional pressure drop, acceleration pressure drop and total pressure drop Along the capillary distribution; pointed out that the dryness and pressure drop along the capillary distribution were non-linear. Therefore, the flow characteristics of the description of the inlet and outlet dryness and pressure drop alone or their import and export of the average, will bring greater error, should take into account the local variation of dryness and pressure drop .