Temporal and radial dependent profiles for surface heat transfer during R404a spray cooling

WANG Rui; ZHOU Zhifu; BAI Feilong; CHEN Bin; WANG Guoxiang

doi:10.11949/j.issn.0438-1157.20141516

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Temporal and radial dependent profiles for surface heat transfer during R404a spray cooling

更新时间：2025-12-10

- Temporal and radial dependent profiles for surface heat transfer during R404a spray cooling
- CIESC Journal Issue 4, Pages: 1258-1264(2015)
- 作者机构：
  
  1. 西安交通大学动力工程多相流国家重点实验室,陕西,西安,710049
  2. 美国Akron大学机械工程系, Ohio Akron,44325
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20141516
  CLC： K124TQ026.4
- Online First：05 April 2015，
  
  Published：05 April 2015
- 稿件说明：
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WANG Rui, ZHOU Zhifu, BAI Feilong, et al. Temporal and radial dependent profiles for surface heat transfer during R404a spray cooling[J]. CIESC Journal, 2015, (4): 1258-1264.
DOI：

WANG Rui, ZHOU Zhifu, BAI Feilong, et al. Temporal and radial dependent profiles for surface heat transfer during R404a spray cooling[J]. CIESC Journal, 2015, (4): 1258-1264. DOI： 10.11949/j.issn.0438-1157.20141516.

摘要

制冷剂瞬态喷雾冷却是辅助激光手术治疗皮肤病的重要手段

目前采用的R134a制冷剂不易抵消深色人种表皮中的黑色素对激光能量的大量吸收

采用沸点较低的R404a制冷剂能更有效防止表皮的热损伤。使用带膨胀腔的新型喷嘴搭建了瞬态喷雾冷却实验台

采用薄膜热电偶快速测温技术对R404a瞬态喷雾冷却表面传热特性进行了研究。结果表明

R404喷雾冷却表面传热具有时间和空间的不均匀性

然而在喷雾中心半径2 mm的中心区域内存在高热通量的均匀冷却区域。在实际激光皮肤临床手术中

参考实验结果可保证喷雾冷却对治疗范围内的表皮进行均匀冷保护。

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.

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