倾斜射流撞击过热壁产生的沸腾诱导液膜雾化

IF 2.8 2区 工程技术 Q2 ENGINEERING, MECHANICAL Experimental Thermal and Fluid Science Pub Date : 2024-07-05 DOI:10.1016/j.expthermflusci.2024.111262
Noritaka Sako , Jun Hayashi , Chihiro Inoue , Hiroshi Kawanabe , Yu Daimon
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引用次数: 0

摘要

对于工业设备的热管理而言,液膜液滴分散导致的净冷却剂流速降低非常重要,因为它可能导致意想不到的热故障。为了更好地理解液膜的液滴分散过程,我们通过实验和理论评估了沸腾诱导雾化在液膜中的特性,液膜是由斜向射流撞击过热壁形成的。雾化过程是通过使用背光技术的放大高速成像进行可视化的。在这项研究中,利用高速放大成像技术观察到了两种液滴。它们是在相对高温的壁面上形成的韧带瓦解的大液滴,以及在成核沸腾状态下通过气泡破裂形成的韧带小液滴。对于由成核沸腾引起的雾化,由于气泡尺寸和液膜厚度增加,在撞击点下游通过气泡破裂产生了更大的液滴。最后,根据气泡破裂的频率和可视化结果测得的液滴大小,估算了成核沸腾产生的液滴的总体积。估算结果表明,喷射液滴的总体积流量与液体喷射流量之比可以忽略不计(2%)。因此,大部分注入的液体最终到达了薄片的润湿前沿,在干燥之前将薄片与壁分离。
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Boiling induced atomization of liquid film produced by oblique jet impingement on superheated wall

For the thermal management of industrial devices, a reduction in the net coolant flow rate by droplet dispersion from a liquid film is important because it can cause unexpected thermal failure. To understand the process of droplet dispersion from a liquid film better, we experimentally and theoretically evaluated the characteristics of boiling-induced atomization in a liquid film formed by oblique jet impingement on a superheated wall. Atomization processes were visualized using magnified high-speed imaging using a backlight technique. In this study, two types of droplets were observed using high-speed-magnification imaging. These were large droplets that disintegrated from the ligament formed on a relatively high-temperature wall, and small droplets from the ligament formed via bubble bursting in the nucleate boiling regime. For the atomization induced by nucleate boiling, larger droplets were produced via bubble bursting further downstream from the impingement point because the bubble size and liquid film thickness increased. Finally, the total volume of the droplets produced by nucleate boiling was estimated from the frequency of bubble bursting and droplet size measured from the visualization results. The estimation results suggest that the ratio of the total volume flow rate of the ejected droplets to the injection flow rate of the liquid was negligible (2%). Thus, most of the injected liquid eventually reached the wetting front of the sheet, separating it from the wall before drying out.

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来源期刊
Experimental Thermal and Fluid Science
Experimental Thermal and Fluid Science 工程技术-工程:机械
CiteScore
6.70
自引率
3.10%
发文量
159
审稿时长
34 days
期刊介绍: Experimental Thermal and Fluid Science provides a forum for research emphasizing experimental work that enhances fundamental understanding of heat transfer, thermodynamics, and fluid mechanics. In addition to the principal areas of research, the journal covers research results in related fields, including combined heat and mass transfer, flows with phase transition, micro- and nano-scale systems, multiphase flow, combustion, radiative transfer, porous media, cryogenics, turbulence, and novel experimental techniques.
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