Analysis on the value of coefficient of mass transfer with phase change in Lee′s equation

Abstract:

To solve the problem that the mass transfer coefficient in Lee's equation need to be obtained depending on the experience, a method was proposed, and two indexes evaluating the rationality of the mass transfer coefficient-latent heat share (the share of latent heat flux in total heat flux) and saturation temperature difference (difference between fluid temperature and saturation temperature) were presented. A steady state model was established to analyze this problem and the expression of latent heat share and saturation temperature difference were obtained by the theoretical guidance. By the expression, the effect of mass transfer coefficient on the simulation was analyzed. The analysis result was validated by the existing theoretical result in particular cases. The results show that the calculation accuracy increases with the increase of the coefficient. Based on these results, the reason for large difference of the coefficient value in different literatures was explained, the method of how to get the coefficient value was presented, and the value range of easy-to-use was suggested.