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首页> 外文期刊>Applied thermal engineering: Design, processes, equipment, economics >Heat transfer characteristics during pulsed spray cooling with R404A at different spray distances and back pressures
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Heat transfer characteristics during pulsed spray cooling with R404A at different spray distances and back pressures

机译：使用R404A在不同喷雾距离和背压下进行脉冲喷雾冷却时的传热特性

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摘要

In order to protect the epidermis from unwanted thermal damage more effectively in laser dermatology for treating darkly pigmented human skin, a novel method is presented here that combines the hypobaric pressure-modulatable technique and a new cryogen of R404A with a far lower boiling temperature than R134a. The influence of spray distance (5-50 mm) and spray back pressure (1-100 kPa) on heat transfer dynamics is systematically investigated. Lowering the pressure always reduces the minimum surface temperature (Turin) over 50 degrees C, and significantly enhances the maximum heat flux (q(max)) by 1.9 times for short spray distances of 5 mm. For longer distances over 20 mm, T-min can be first reduced, and q(max) undergoes an initial increase and a subsequential decrease as the pressure is above 20 kPa. Further lowering pressure below 20 kPa makes T-min, increase inversely, and causes a sharp reduction of q(max). To obtain low T-min, and high q(max), an appropriate spray distance and pressure should be employed. (C) 2016 Elsevier Ltd. All rights reserved.
机译：为了在激光皮肤病学中更有效地保护表皮免受有害的热损伤，以治疗深色皮肤，本文提出了一种新颖的方法，该方法结合了低压调压技术和新型R404A冷冻剂，其沸腾温度远低于R134a 。系统研究了喷雾距离（5-50 mm）和喷雾背压（1-100 kPa）对传热动力学的影响。降低压力总是会在50摄氏度以上降低最低表面温度（Turin），对于5 mm的短喷涂距离，最大热通量（q（max））会大大提高1.9倍。对于超过20 mm的较长距离，可先减小T-min，并且当压力高于20 kPa时，q（max）会经历初始增大，随后减小。将压力进一步降低到20 kPa以下会使T-min反向增加，并导致q（max）急剧减小。为了获得较低的T-min和较高的q（max），应采用适当的喷雾距离和压力。 （C）2016 Elsevier Ltd.保留所有权利。

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