表面温度测量方式对喷雾冷却表面传热特性的影响

发布时间：2018-04-01 12:01

本文选题：喷雾冷却　切入点：表面传热　出处：《化工学报》2016年11期

【摘要】：喷雾冷却在工业过程中应用广泛,制冷剂喷雾是激光皮肤手术中实施表皮冷保护的必要手段。为提高冷却效率,需要通过表面温度的测量反推表面传热特性。为探索不同表面温度测量方式对实验结果的影响,搭建了瞬态喷雾冷却实验台,分别使用磁控溅射薄膜热电偶(TFTC)、丝状热电偶(FTC)和片状热电偶(STC)研究了R404A制冷剂喷雾环氧树脂表面传热特性的差异。实验结果表明,磁控溅射薄膜热电偶(TFTC)热响应性能最佳,能准确及时地反映表面温度的瞬态变化且可与热通量变化准确对应。丝状热电偶(FTC)和片状热电偶(STC)属于间接测温,温度变化存在明显滞后,影响热通量、对流传热系数等表面传热特性的精确分析。薄膜溅射热电偶测温是准确研究瞬态喷雾冷却表面传热过程的可靠手段,可为临床治疗提供理论指导。
[Abstract]:Spray cooling is widely used in industrial process. Refrigerant spray is a necessary means to protect skin surface in laser skin surgery.In order to improve the cooling efficiency, the surface heat transfer characteristics should be pushed back by measuring the surface temperature.In order to explore the influence of different surface temperature measurement methods on the experimental results, a transient spray cooling test bench was built.The surface heat transfer characteristics of R404A refrigerant sprayed epoxy resin were studied by using magnetron sputtering thin film thermocouple TFTC, filamentary thermocouple FTC and flake thermocouple STC respectively.The experimental results show that the thermal response of the magnetron sputtering thin film TFTC is the best, which can accurately and timely reflect the transient change of surface temperature and correspond to the change of heat flux.The filamentary thermocouple FTC and the flake thermocouple STC) belong to the indirect temperature measurement, the temperature change has obvious lag, affects the heat flux, the convection heat transfer coefficient and so on surface heat transfer characteristic accurate analysis.Thin film sputtering thermocouple temperature measurement is a reliable method to study the heat transfer process of transient spray cooled surface, which can provide theoretical guidance for clinical treatment.
【作者单位】：西安交通大学动力工程多相流国家重点实验室;美国Akron大学机械工程系;
【基金】：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~~
【分类号】：TK124

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