Droplet rebound phenomenon under sudden decrease of gravity

	Droplet rebound phenomenon under sudden decrease of gravity
	Zhang L(张良); Zhao JF(赵建福)
	2013
会议日期	September 23, 2013 - September 27, 2013
会议地点	Beijing, China
关键词	Fluid dynamics Numerical methods Space applications Wetting Droplet rebounds Droplet spreading Dynamic characteristics Level Set method Normal gravities Physical process Small droplets Surface transformations
页码	436-442
英文摘要	The physical process of droplet spreading or wetting on solid surface plays very important role in many industrial applications. On the other hand, for space applications, original static droplet on a flat surface under normal gravity would cause movement when gravity was suddenly decreased due to interfacial recoil. If the recoil is sufficiently strong, the drop would rebound, detachment, bouncing up. Abundant of fluid dynamic characteristics are included in this process which is a novelty and typical fundamental phenomenon in microgravity physics of fluids, and it is very meaningful to reveal the basic law of fluid dynamics. In this study, a liquid drop rebounds on a flat surface caused by sudden decrease of gravity is simulated with Level Set method. The results show that a series of movements of the droplet like rebounding, detachment, bouncing up, oscillation and transformation will be produced by surface recoil after certain degree of sudden decrease of gravity. For the droplet of same size, the ability of rebound is increased and velocity of rising up becomes faster with the increase of gravity falling. The tendency of rebound is increased with the larger of the size when gravity is decreased the same level. No detachment is even occurred for small droplets. Among the droplets detached, the detachment time linearly proportioned with time is extended with the larger of the droplet. However, during rising up, the frequency of surface transformation and oscillation is gradually decreased with the larger of the droplet, the amplitude acts the opposite. Suratman number plays important role in the process of droplet rebound.
会议录	64th International Astronautical Congress 2013, IAC 2013
语种	英语
ISBN号	9781629939094
内容类型	会议论文
源URL	[http://dspace.imech.ac.cn/handle/311007/77981]
专题	力学研究所_国家微重力实验室
作者单位	Key Laboratory of Microgravity (National Microgravity Laboratory)/CAS, Institute of Mechanics, Chinese Academy of Sciences (CAS), 15 Beisihuan Xilu, Beijing 100190, China
推荐引用方式 GB/T 7714	Zhang L,Zhao JF. Droplet rebound phenomenon under sudden decrease of gravity[C]. 见:. Beijing, China. September 23, 2013 - September 27, 2013.