Year: 2002
Type: conference-paper
Abstract: The flow characteristic of refrigerant in a capillary tube is determined by the flow in the two-phase region.There is thermodynamic non-equilibrium between liquid and vapor in the two-phase region.In addition, there are two decisive transitions of flow pattern in this two-phase region, one is from bubble flow to churn-turbulent flow, and the other is from churn-turbulent flow to annular flow.Aiming at simulating the flow of refrigerant in the two-phase region, a two-fluid model is established based on thermodynamic non-equilibrium between liquid and vapor.The simulation results agree well with the experimental data that verifies the two-fluid model.The result shows that slip velocity between bubbles and liquid is small in bubble flow regime, grows slowly in the churn-turbulent flow region, and increases rapidly in the annular flow region.It also shows that mass flow rate of refrigerant increases with inlet pressure and increases with increase of the subcooled degree of refrigerant at the inlet.
Authors: Xiang Cao, Yingwei Wu, G Yan, Rui Zhu
Language: English
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W1480025478