文章基本信息

标题：Local mass flux and pinning behavior of an evaporating droplet on heated aluminum surfaces
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作者：Joo Hyun Moon ; Chang Kyoung Choi ; Seong Hyuk Lee 等
期刊名称：Case Studies in Thermal Engineering
印刷版ISSN：2214-157X
电子版ISSN：2214-157X
出版年度：2021
卷号：26
页码：101171
DOI：10.1016/j.csite.2021.101171
出版社：Elsevier B.V.
摘要：The present study aims to investigate the characteristics of pinning behaviors and local mass flux variations during droplet evaporation at different surface temperatures ranging from 22.5 °C to 80 °C. An evaporating droplet is visualized by a CMOS camera, and the images are analyzed from droplet deposition to completion of evaporation. We measure the contact angle, the contact diameter, the droplet volume, the total evaporation time, and the pinning time during evaporation. The pinning time and Marangoni number increase with surface temperatures in the range from 20 °C to 50 °C; however, they decrease at surface temperatures higher than 50 °C. Moreover, the present study analyzes the local mass flux variation according to the surface temperature, showing the increase in the local mass flux over time. We also consider the change in vapor concentrations for the heated surfaces to estimate the local mass flux. Indeed, the local mass flux at the contact line becomes much higher; it experiences over a 10-fold increase from 0.1 t f to 0.9 t f .
关键词：Droplet ; Evaporation ; Local mass flux ; Pinning