化工学报Issue(4)：1258-1264,7.DOI:10.11949/j.issn.0438-1157.20141516
R404a喷雾冷却表面传热特性的时空不均匀性
Temporal and radial dependent profiles for surface heat transfer during R404a spray cooling
摘要
Abstract
Cryogen spray cooling has been applied to protect epidermis from thermal damage during laser surgery. However, the presently used cryogen, R134a shows unsatisfactory efficacy in minimizing laser energy absorption by melanin in darkly pigmented human skins. Previous work of our group showed that R404a had the potential of improving cooling protection to epidermis, while there is few related research on the surface heat transfer during R404a spray cooling. This paper presents an experimental study on the temporal and radial variation in temperature and heat flux during spray cooling using R404a by a specially designed nozzle with expansion chamber, which significantly improved the atomization effect. The temporal and radial conditions strongly influenced uniformity of surface heat transfer. However, there existed a sub-region of uniform cooling with radius of 2 mm around spray center with high heat flux. The result of this experiment could provide guidance for guaranteeing uniform cooling protection during clinical laser surgery.关键词
表面/传热/汽化/R404a/喷雾冷却Key words
surface/heat transfer/evaporation/R404a/spray cooling分类
能源科技引用本文复制引用
王锐,周致富,白飞龙,陈斌,王国祥..R404a喷雾冷却表面传热特性的时空不均匀性[J].化工学报,2015,(4):1258-1264,7.基金项目
国家自然科学基金重点项目（51336006）；中央高校基本科研业务费专项资金。@@@@ supported by National Natural Science Foundation Key Project (51336006) and the Fundamental Research Funds for the Central University （51336006）
