Anomalous Impact of Surface Wettability on Leidenfrost Effect at Nanoscale
Yue Wang1,2 , Xiaoxiang Yu1,2 , Xiao Wan1,2 , Nuo Yang1,2 , and Chengcheng Deng1,2*
1 School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China2 State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China
Abstract ：Leidenfrost effect is a common and important phenomenon which has many applications, however there is a limited body of knowledge about the Leidenfrost effect at the nanoscale regime. We investigate the impact of substrate wettability on Leidenfrost point temperature (LPT) of nanoscale water film via molecular dynamics simulations, and reveal a new mechanism different from that at the macroscale. In the molecular dynamics simulations, a method of monitoring density change at different heating rates is proposed to obtain accurate LPT under different surface wettability. The results show that LPT decreases firstly and then increases with the surface wettability at the nanoscale, which is different from the monotonous increasing trend at the macroscale. The mechanism is elucidated by analyzing the competitive effect of adhesion force and interfacial thermal resistance, as well as different contributions of gravity on LPT at the nanoscale and macroscale. The investigations can deepen the understanding of Leidenfrost effect at the nanoscale regime and also facilitate to guide the applications of heat transfer and flow transport.
收稿日期: 2021-06-01
Editors' Suggestion
出版日期: 2021-09-02
:
44.10.+i
(Heat conduction)
44.05.+e
(Analytical and numerical techniques)
47.61.-k
(Micro- and nano- scale flow phenomena)
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2021, Vol. 38 
