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研究水平管外降膜蒸发传热时,涉及到管外液膜流动状态以及液体与管内蒸汽的传热、传质等问题。通过对FLUENT进行二次开发,建立水平管降膜蒸发的数学物理模型,模拟考察传热管外液膜流动状态及液膜状态对传热的影响,并与试验结果进行比较。结果表明试验与模拟结果趋势一致,误差<10%,说明模拟计算方法是可行的。模拟及试验研究表明,传热管外液膜及其汽液界面对传热性能有重要影响,是过程控制热阻之一,对管外液膜及界面的研究是今后水平管降膜蒸发研究的一个重要方向。
Research on the falling film evaporation outside the tube involves heat transfer and mass transfer of the liquid film outside the tube as well as the vapor inside the tube and the tube. Through the secondary development of FLUENT, a mathematical physics model of horizontal tube falling film evaporation was established. The influence of liquid film flow state and liquid film state on the heat transfer was simulated and compared with the experimental results. The results show that the experimental and simulation results have the same tendency with an error of <10%, indicating that the simulation method is feasible. Simulation and experimental studies show that the liquid film outside the heat transfer tube and its vapor-liquid interface have an important influence on the heat transfer performance, which is one of the thermal resistances of the process. The research on the liquid film and interface outside the tube is the future research on the falling film evaporation of the horizontal tube An important direction.