化工学报2011，Vol.62Issue(12)：3323-3329,7.DOI:10.3969/j.issn.0438-1157.2011.12.003
连续液柱流表面真空蒸发模型
Modeling and simulation of vacuum evaporation from surface of a continuous falling liquid column
摘要
Abstract
Modeling and simulation of vacuum evaporation from the surface of a continuous falling liquid column were carried out to obtain a mechanism-based prediction for application in energy-efficient vapor-liquid separation process. The parameters governing the continuous flow of falling liquid column out-of an orifice were investigated to determine the critical conditions for breakup of the liquid column. The mechanism of evaporation from the free surface of liquid column was analyzed and a mathematical model of the system was set up. The simulation results were in good agreement with the experimental data. In an adiabatic flash vaporization, the temperature gradient near the interface on the liquid side was a sensitive indicator of evaporation rate. This means that the resistance of heat transfer mainly lies in the liquid phase, so that the evaporation rate can be enhanced by increasing the liquid velocity out-of the orifice and narrowing the orifice diameter but without the breakup of liquid column, or increasing the degree of superheat.关键词
连续液柱流/断裂判据/真空蒸发/模型与模拟/温度梯度/蒸发速率Key words
continuous falling liquid column/ criterion of breakup/ vacuum evaporation/ modeling and simulation/ temperature gradient/ evaporation rate分类
化学化工引用本文复制引用
张峰榛,魏文韫,余徽,夏素兰,朱家骅..连续液柱流表面真空蒸发模型[J].化工学报,2011,62(12):3323-3329,7.基金项目
国家自然科学基金项目(20806048). （20806048）
