Numerical Simulation of Natural Gas Condensation Flow and Heat Transfer in Spiral Tube
For the condensation of mixed working medium in the spiral tube,a variable temperature phase change model for the condensation flow and heat transfer of natural gas was proposed by introducing the temperature slip factor based on Lee's model.Both the new model and Lee's model were used to simulate the condensation flow and heat transfer under different pressure conditions.The results show that the temperature calculated by the new model decreases significantly along the flow direction,which reflects the influence of temperature slip of natural gas.The new model can better reflect the physical property variation of the actual natural gas during condensation,and the secondary flow disturbance phenomenon can be clearly observed in the gas-liquid phase distribution diagram.In order to take the effect of mass diffusion thermal resistance into account,the simulation results of the new model were corrected by the Silver method,and the deviation of the corrected average heat transfer coefficient value from the experimentally determined value was between 10.7%and 14%,the prediction accuracy is better than that of the Lee model(25%).The modified variable temperature phase change model is suitable for the calculation of condensation flow and heat transfer of natural gas mixtures in the spiral tube.
NETL
NSTL
万方数据
维普
