Numerical simulation on the condensation characteristics outside the tube in intermediate fluid vaporizer for LNG cold energy power generation
In this study,the condensation process of the propane outside the tube in the condenser unit of the intermediate fluid vaporizer which is suitable for LNG cold energy generating device was examined.By establishing the corresponding numeri-cal model,the VOF model was used to trace the gas-liquid phase interface,and the LEE model was used as the phase change heat and mass transfer model.The transient two-dimensional CFD simulation was carried out on the liquid-film flow and con-densation heat transfer of gaseous propane outside the tube.The simulation value of heat transfer coefficient outside the tube was compared with the theoretical solution of Nusselt formula.The deviation was less than 10％,which proved the accuracy of the model for simulating the condensation process of the propane outside the tube in the condenser.In addition,the condensation heat transfer characteristics of the propane in the IFV were compared with that of the conventional IFV,and it was found that the heat transfer coefficient outside the tube of this IFV is significantly lower than that of the conventional IFV when the wall subcool-ing degree is small.
Condenser of IFVTwo-phase flowPhase transition simulationFilm condensation
NETL
NSTL
万方数据
