激光光谱法测量液膜蒸发率及传质系数

he thickness and temperature of the liquid film were measured simultaneously in this paper based on the laser absorption spectroscopy. According to the variation of the liquid film thickness in film evaporation process, liquid film evaporation rate and its mass transfer coefficient were determined, The measurement upper limit for film thickness was 1mm. The film thickness variation during the heating process was also measured and the evaporation rate and mass transfer cofficient were obtained. The correlation between evaporation rate and mass transfer coefficient and temperature was discussedhere. The experimental results indicated that the temperature could intensify the evaporation rate and mass transfer coefficient. It provides theoritical foundation for further research of liquid film phase transition process.