期刊
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
卷 164, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2020.120580
关键词
Droplet stream; Boiling; Microstructured surface; Laser-ablation; Leidenfrost temperature; Nukiyama temperature
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC)
Experimental investigation on transient flow boiling of ethanol droplets impinging on heated copper plates reveals that microstructured surfaces can achieve boiling at lower temperatures and increasing surface roughness decreases the Leidenfrost temperature. Additionally, it is found that surface microstructures slightly reduce the Nukiyama temperature. This work is relevant to high temperature boiling regimes in two-phase spray cooling applications.
We experimentally investigate the transient flow boiling that takes place when a stream of ethanol droplets starts impinging on a heated copper plate. If the initial surface temperature is sufficiently high, the flow boiling develops from film boiling, to transition boiling and then nucleate boiling, while the flow behavior development shows repelling, contacting, and pooling stages. Copper plates with laser-ablated surface microstructures are used in the tests to investigate the effects of surface microstructures on the boiling regimes. It is found that film boiling can be achieved on microstructured surfaces with lower initial temperatures as compared to the smooth surface. This observation is supported by boiling curve analysis, which noticeably shows the Leidenfrost temperature decreases with increasing surface roughness. It is also found that surface microstructures slightly reduce the Nukiyama temperature. This work is relevant to two-phase spray cooling in high temperature boiling regimes. (C) 2020 Elsevier Ltd. All rights reserved.
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