基于两相流流型的平行流冷凝器整体仿真模型与实验验证

引言平行流冷凝器作为一种新颖的换热器加之其不同于传统翅片管换热器的结构,因此其传热流动性能尚处研究之中。尤其是平行流冷凝器制冷剂侧微通道两相流机制及其转变不同于常规的管子,以往关于平行流冷凝器整体仿真模型的研究中,微通道两相流数值模拟大都采用传统大管径模型或者修正

Simulation model and experimental study on parallel flow condenser based on two-phase flow regime

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.