Spin-affected reflexive and stretching separation of off-center droplet collision

doi:10.1103/PhysRevFluids.7.013603

CORC > 力学研究所 > 中国科学院力学研究所 > 高温气体动力学国家重点实验室

	Spin-affected reflexive and stretching separation of off-center droplet collision
	He, Chengming 3; Yue, Lianjie 2,3; Zhang, Peng 1
刊名	PHYSICAL REVIEW FLUIDS
	2022-01-18
卷号	7 期号:1 页码:25
ISSN号	2469-990X
DOI	10.1103/PhysRevFluids.7.013603
通讯作者	Zhang, Peng(pengzhang.zhang@polyu.edu.hk)
英文摘要	Recent studies have demonstrated the significant roles of droplet self-spin motion in affecting the head-on collision of binary droplets. In this paper, we present a computational study by using the volume-of-fluid method to investigate the spin-affected droplet separation of off-center collisions, which are more probable in reality and phenomenologically richer than head-on collisions. Different separation modes are identified through a parametric study with varying spinning speed and impact parameter. A prominent finding is that increasing the droplet spinning speed tends to suppress the reflexive separation and to promote the stretching separation. Physically, the reflexive separation is suppressed because the increased rotational energy reduces the excessive reflexive kinetic energy within the droplet, which is the cause for the droplet reflexive separation. The stretching separation is promoted because the increased droplet angular momentum enhances the local stretching flow within the droplet, which tends to separate the droplet. The roles of orbital angular momentum and spin angular momentum in affecting the droplet separation are further substantiated by studying the collision between two spinning droplets with either the same or opposite chirality. In addition, a theoretical model based on conservation laws is proposed to qualitatively describe the boundaries of coalescence-separation transition influenced by droplet self-spin motion.
资助项目	National Science Foundation of China[12102437] ; National Science Foundation of China[52176134] ; China Postdoctoral Science Foundation[2020M680690] ; Hong Kong RGC/GRF ; PolyU[152188/20E] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDA17030100]
WOS关键词	COALESCENCE ; SIMULATIONS ; MODELS
WOS研究方向	Physics
语种	英语
WOS记录号	WOS:000747882800001
资助机构	National Science Foundation of China ; China Postdoctoral Science Foundation ; Hong Kong RGC/GRF ; PolyU ; Strategic Priority Research Program of Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/88414]
专题	力学研究所_高温气体动力学国家重点实验室
通讯作者	Zhang, Peng
作者单位	1.Hong Kong Polytech Univ, Dept Mech Engn, Hung Hom, Kowloon, Hong Kong 999077, Peoples R China 2.Chinese Acad Sci, State Key Lab High Temp Gas Dynam, Inst Mech, 15 Beisihuanxi Rd, Beijing 100190, Peoples R China 3.Chinese Acad Sci, Wide Range Flight Engn Sci & Applicat Ctr, Inst Mech, 15 Beisihuanxi Rd, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	He, Chengming,Yue, Lianjie,Zhang, Peng. Spin-affected reflexive and stretching separation of off-center droplet collision[J]. PHYSICAL REVIEW FLUIDS,2022,7(1):25.
APA	He, Chengming,Yue, Lianjie,&Zhang, Peng.(2022).Spin-affected reflexive and stretching separation of off-center droplet collision.PHYSICAL REVIEW FLUIDS,7(1),25.
MLA	He, Chengming,et al."Spin-affected reflexive and stretching separation of off-center droplet collision".PHYSICAL REVIEW FLUIDS 7.1(2022):25.