摘要
制冷剂喷雾可对激光治疗葡萄酒色斑过程进行有效冷却以保护表皮不受热损伤,其瞬态喷雾冷却过程涉及复杂的液滴蒸发、强烈的对流换热和质量传递。本文对描述制冷剂喷雾平衡蒸发阶段单个液滴蒸发的理论模型进行改进,比较了基于各种假设的七个气相传质模型对R-134a喷雾冷却过程中单个液滴蒸发特性的影响,发现考虑过热影响的气相模型所预测的蒸发过程最接近实验结果,用该模型研究了液滴初始直径和速度等参数对液滴蒸发特性的影响。
Cryogen Spray Cooling is used for cooling human skin during selected laser treatment of Port Wine Stain. Transient state cryogen spray involves intricate droplets evaporation, intense heat convection and mass transfer. In present paper, mass transfer equation of single droplet evaporation model for cryogen spray equilibrium evaporation stage was improved and the effect of seven gas phase models on single droplet evaporation characteristic in R-134a cryogen spray is compared. It is pointed out that the gas phase model which takes the effect of superheat into account was most coincidence with experiment data. A parametric study of the influences of initial diameter and velocity on the droplet evaporation is then carried out by this gas phase model.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2009年第4期653-656,共4页
Journal of Engineering Thermophysics
基金
长江学者讲座教授配套项目
国家自然科学基金项目(No.50676079)
教育部新世纪优秀人才计划(No.NCET-07-0661)
教育部科学技术研究重点项目(No.107101)资助
关键词
制冷剂喷雾冷却
液滴蒸发
葡萄酒色斑
激光治疗
cryogen spray cooling
droplet evaporation
port wine stain
laser treatment
