Numerical simulation of heat transfer characteristic and bubble force analysis of low flow rate vapor condensation under rolling motion
Steam direct contact condensation has high efficiency in heat and mass transfer and is widely used in nuclear energy safety and other fields.Compared with the stable condition on land,the swing movement under the marine conditions may exacerbate the oscillation of the auto liquid interface and further affect the safe operation of the equipment.Therefore,the condensation process of low flow rate steam under rolling conditions was studied by numerical simulation,and the changes of pressure,heat transfer characteristics and bubble forces under rolling conditions were analyzed.The results showed that the sharp fluctuations of pressure and heat transfer coefficient mainly concentrated in the phase of bubble shrinkage and separation,when the bubble forces also reached the maximum,and the bubble was mainly affected by the inertia force and condensation force.In addition,it is found that the inertia force partially increases due to the change of bubble velocity under the rolling condition,and the additional rolling velocity brought by the rolling motion strengthens the heat transfer performance of the vapor-liquid interface,and the average heat transfer coefficient is much higher than that under the stationary condition.
vapor direct contact condensationbubble forcegas-liquid flowCFDtransport processesrolling motion
万方数据
维普
