THE NUMERICAL SIMULATION OF THE FLOW AND HEAT TRANSFER FOR THE POROUS WICK IN CPL EVAPORATOR

摘要

The computational model is developed for the analysis of the transient operation of porous wick in the flat CPL evaporator. The flow in the porous medium is modeled by the Brinkman-Forchheimer extended Darcy model. On the Basis of the microscopic conservation, the local thermal equilibrium and volume averaging theory are introduced to establish the mathematical model. Equations about the liquid-saturated layer and the vapor-saturated layer in porous wick are established respectively, which are coupled with matching conditions at the liquid-vapor interface. Based on the mathematical model, numerical method is adopted to simulate the flow and heat transfer in porous wick of evaporator under different heat loads. The numerical simulation results show reasonable agreement with the temperature, velocity and phase change interface position. The transient temperature characteristics are also studied in this paper.