Spin-affected reflexive and stretching separation of off-center droplet collision | |
He, Chengming3; Yue, Lianjie2,3; Zhang, Peng1 | |
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. |
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