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Interfacial Phenomena and Heat Transfer
ESCI

ISSN 印刷: 2169-2785
ISSN オンライン: 2167-857X

Open Access

Interfacial Phenomena and Heat Transfer

DOI: 10.1615/InterfacPhenomHeatTransfer.2014010424
pages 41-54

REBOUND OF LIQUID DROPLETS CAUSED BY SUDDEN DECREASE OF GRAVITY

Liang Zhang
Key Laboratory of Microgravity (National Microgravity Laboratory), Institute of Mechanics, Chinese Academy of Sciences (CAS), Beijing 100190, P.R. China
Zhen-Dong Li
Key Laboratory of Microgravity (National Microgravity Laboratory)/CAS, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
Jian-Fu Zhao
CAS Key Laboratory of Microgravity, Institute of Mechanics, Chinese Academy of Sciences. 15 Beisihuan Xilu, Beijing 100190, China; School of Engineering Science, University of Chinese Academy of Sciences, 19A Yuquan Rd, Beijing, 100049, China

要約

The rebound of a liquid droplet from a flat solid surface after a sudden decrease of gravity, as well as its spread on the surface in normal gravity, is simulated numerically using the level set method. The predicted static shape of the spreading droplet in normal gravity is in good agreement with that predicted by the software program, Surface Evolver, while the simulated behaviors of the rebounding droplet show qualitative agreement with published experimental observations in the drop tower. It is found that a series of rebound movements−including deformation, departure, bounce, and oscillation of the liquid droplet−are induced by surface recoil after a sudden decrease of gravity. The rebound ability is enhanced by the gravity decrease and the liquid droplet size. No detachment occurs for droplets with small Bond numbers, where a much weak influence of gravity is exhibited compared with surface tension even in normal gravity. Beyond a certain threshold, the departure time of the liquid droplet increases with its size. The amplitude of the surface oscillation also increases; however, the frequency decreases gradually with the droplet size, which is in agreement with the classical theory of droplet oscillation.


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