关键词: 微通道, 两相流流型, 冷凝, 整体仿真模型

Abstract: The pressure drop and heat transfer of refrigerant depend on the mass velocity, phase state and flow regime in the non-circular microchannel of parallel flow condenser. However, the flow regime is not considered in available researches, in which the predictions on pressure drop and heat transfer coefficients in the two-phase flow are not satisfactory. In this study, a model with different flow regimes is employed based on the two-phase flow on refrigerant side and the pressure drop is predicted from the change of flow regime. The coupling between pressure drop and heat transfer is investigated. A simulation model on the parallel flow condenser is established and studied experimentally under 6 different working conditions. It is found that the multiple-flow-regime model with intermittent flow model, overlap model and annular flow model as submodels can be used to predict the heat transfer and flow characteristics of microchannel condenser. The model may provide a reference for optimization design for parallel flow condenser.

Key words: microchannel, two-phase flow regime, condensation, simulation model