关键词: MVR蒸发器, 沸腾蒸发, 强化传热传质, 数值模拟, 节能

Abstract: A three-dimensional physical model of boiling heat and mass transfer in the tube for MVR rising film circulation evaporator was built by CFD software. Standard k-ε turbulent model，multiphase mixture model and user-defined function (UFD) of the mass transfer and energy transfer between vapor phase and liquid phase compiled by C language were used in the simulation of the performances of boiling evaporation heat and mass transfer of amino acid waste water in the smooth tube and corrugated tube. The distribution laws of the turbulent characteristic field，temperature field，phase change volume fraction and average boiling heat transfer coefficient of smooth tube and corrugated tube were obtained. The flow and the heat and mass transfer characteristic of smooth tube and corrugated tube were compared. The influences of different wall heating temperature and inlet velocity on boiling heat transfer performance were analyzed. The results showed that the boiling evaporation operation of amino acid waste water in low temperature and negative pressure conditions can be realized by MVR rising film circulating evaporator，the different structures of heat transfer tube influence the fluid flow and heat and mass transfer，corrugated tube can improve the average boiling heat transfer coefficient 2.2 times of smooth tube.

Key words: MVR evaporator；boiling evaporation；enhancement heat and mass transfer, numerical simulation；saving energy