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首页> 外文期刊>International Journal of Heat and Mass Transfer >Experimental investigation of the impact of geometrical surface modification on spray cooling heat transfer performance in the non-boiling regime
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Experimental investigation of the impact of geometrical surface modification on spray cooling heat transfer performance in the non-boiling regime

机译：非沸腾几何表面改性对喷雾冷却换热性能影响的实验研究

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An experimental investigation was conducted to study the impact of geometrical surface modification on the thermal performance of a spray cooling system. All experiments were performed using a closed loop spray cooling system. Deionized water was used as the working fluid. Three different modified surfaces were examined and compared with a plain copper surface under the same operating conditions. The first surface (M1) was modified with four circular grooves each having a width and depth of 0.5 mm and a pitch of 1.5 mm. The second and third surfaces (M2) and (M3) were modified with four circular grooves each overlaid with four and eight radial grooves, respectively. Each radial groove had width and depth of 0.5 mm. All surfaces were tested at three nozzle differential pressures: 80 kPa, 140 kPa, and 185 kPa. The nozzle-to-surface distance, coolant inlet temperature, surface temperature, and chamber pressure were maintained at 10 mm, similar to 22 degrees C, 100 degrees C, and atmospheric pressure, respectively. The results indicated that the nozzle differential pressure had a significant effect on the spray cooling thermal performance of all surfaces. Furthermore, surface (M3) had the highest heat transfer enhancement ratio at all operating conditions, followed by surfaces (M2), and (M1), where the maximum heat transfer enhancements were 80%, 36.3%, and 28.7%, respectively. Thus, signifying that using surfaces modified with a combination of circular and radial grooves can enhance spray cooling heat transfer performance. (C) 2018 Elsevier Ltd. All rights reserved.
机译：进行了实验研究，以研究几何表面改性对喷雾冷却系统热性能的影响。所有实验均使用闭环喷雾冷却系统进行。去离子水用作工作流体。在相同的操作条件下，检查了三种不同的改性表面，并与纯铜表面进行了比较。第一表面（M1）被修改为具有四个圆形凹槽，每个圆形凹槽的宽度和深度为0.5mm，间距为1.5mm。第二和第三表面（M2）和（M3）被修改为具有四个圆形凹槽，每个圆形凹槽分别覆盖有四个和八个径向凹槽。每个径向凹槽的宽度和深度为0.5mm。在三个喷嘴压差下测试了所有表面：80 kPa，140 kPa和185 kPa。喷嘴到表面的距离，冷却剂入口温度，表面温度和腔室压力保持在10 mm，分别类似于22摄氏度，<100摄氏度和大气压。结果表明，喷嘴压差对所有表面的喷雾冷却热性能有显着影响。此外，表面（M3）在所有操作条件下的传热增强率最高，其次是表面（M2）和（M1），最大传热增强率分别为80％，36.3％和28.7％。因此，表明使用经圆形和径向凹槽组合修饰的表面可以增强喷雾冷却的传热性能。 （C）2018 Elsevier Ltd.保留所有权利。

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