Symmetry breaking in drop bouncing on curved surfaces

被引:257
作者
Liu, Yahua [1 ,2 ]
Andrew, Matthew [3 ]
Li, Jing [1 ]
Yeomans, Julia M. [3 ]
Wang, Zuankai [1 ,4 ]
机构
[1] City Univ Hong Kong, Dept Mech & Biomed Engn, Hong Kong 999077, Hong Kong, Peoples R China
[2] Dalian Univ Technol, Minist Educ, Key Lab Precis & Nontradit Machining Technol, Dalian 116024, Peoples R China
[3] Rudolf Peierls Ctr Theoret Phys, Oxford OX1 3NP, England
[4] City Univ Hong Kong, Shenzhen Res Inst, Shenzhen 518057, Peoples R China
基金
中国国家自然科学基金;
关键词
LATTICE BOLTZMANN SIMULATIONS; CONTACT TIME; IMPACT; DYNAMICS; SPEED;
D O I
10.1038/ncomms10034
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The impact of liquid drops on solid surfaces is ubiquitous in nature, and of practical importance in many industrial processes. A drop hitting a flat surface retains a circular symmetry throughout the impact process. Here we show that a drop impinging on Echevaria leaves exhibits asymmetric bouncing dynamics with distinct spreading and retraction along two perpendicular directions. This is a direct consequence of the cylindrical leaves that have a convex/concave architecture of size comparable to the drop. Systematic experimental investigations on mimetic surfaces and lattice Boltzmann simulations reveal that this novel phenomenon results from an asymmetric momentum and mass distribution that allows for preferential fluid pumping around the drop rim. The asymmetry of the bouncing leads to similar to 40% reduction in contact time.
引用
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页数:8
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