期刊
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
卷 168, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2020.120891
关键词
Drop impingement; Leidenfrost; Explosive lift-off; Micro pillar array; Outcomes of drop impact
资金
- Incheon National University
The study investigated the effects of wall temperature, micro-pillar array size, and micro-pillar height on the outcomes of a single water drop impinging onto a heated surface with micro-pillar arrays. Micro-pillar arrays can lead to explosive lift-off behavior and increase the Leidenfrost temperature.
In this study, the effects of wall temperature, micro-pillar array size, and micro-pillar height on the outcomes of the impingement of a single water drop impingement onto a heated surface with micro-pillar arrays were investigated. The micro-pillar arrays were designed with four different diameters and spacing (D, S: 5, 10, 15, and 20 mu m) and three different heights (H: 20, 30, and 40 mu m). For each type of surface, we classified the outcomes of drop impingement regimes into contact boiling, explosive lift-off, transition rebound, and Leidenfrost rebound by high-speed visualization. Micro-pillar arrays can result in the explosive lift-offbehavior and increase the Leidenfrost temperature. The explosive lift-off occurs when the liquid-vapor interface is pushed up by vapor pressure. Based on the force balance analysis, the behaviors of the liquid-vapor interface were analyzed based on the competing wetting (capillary pressure) and non-wetting (vapor pressure) pressures to understand the explosive lift-off triggering mechanism. (C) 2020 Elsevier Ltd. All rights reserved.
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