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

文献类型：期刊论文

作者He, Chengming3; Yue, Lianjie2,3; Zhang, Peng1; Yue LJ(岳连捷)
刊名PHYSICAL REVIEW FLUIDS
出版日期2022-01-18
卷号7期号:1页码:25
ISSN号2469-990X
DOI10.1103/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.
WOS关键词COALESCENCE ; SIMULATIONS ; MODELS
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
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,et al. 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,&岳连捷.(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.

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来源：力学研究所

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