Two-phase Flow Characteristics Of Adiabatic Capillary And Experimental Research

The capillary is the throttle component applied extensively in the small-scale refrigeration equipment. The perfect match of capillary has important influence on the whole performance of the refrigeration system. Especially, nowadays the refrigeration industry faces some problem as the substitute for old refrigerant and the development of new refrigeration products. So study on the two-phase flow characteristics of refrigerant in the capillary tubes is more and more important, and this is significant for the match of the refrigeration system using new refrigerant.At present, research on the two-phase flow characteristics of refrigerant in the capillary tubes is mainly based on the homogeneous model and the influence of metastable phenomenon is mostly neglected. For these reasons, great error exists in the simulation of the capillary tubes. In view of this, this thesis regards adiabatic capillary as the target, studies the following groundwork:1. Analyze the two-phase flow of refrigerant in the capillary tubes; based on the drift flux model, a mathematical model of the adiabatic capillary tubes is developed with metastable influence considered as the emphasis.2. Using the mathematical model, a numerical simulation program is developed based on the programming language Visual C++ 6.0. Through calculating, the two-phase flow characteristics of the refrigerant in the adiabatic capillary tubes are analyzed.3. Established an experimental table for the adiabatic capillary tubes research. Through experiment, the mathematical model is proved to be reliable and the simulation program is proved to be useful in the match of refrigeration system using new refrigerant from three respects...