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Chin. Phys. B, 2022, Vol. 31(8): 084702    DOI: 10.1088/1674-1056/ac5c33

Drop impact on substrates with heterogeneous stiffness

Yang Cheng(成阳)1,†, Jian-Gen Zheng(郑建艮)2,†, Chen Yang(杨晨)1, Song-Lei Yuan(袁松雷)1, Guo Chen(陈果)1,‡, and Li-Yu Liu(刘雳宇)1
1 Chongqing Key Laboratory of Soft Condensed Matter Physics and Smart Materials, College of Physics, Chongqing University, Chongqing 400044, China;
2 School of Optoelectronic Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
Abstract  Previous studies of drop impact mainly focus on homogeneous substrates while heterogeneous substrates remain largely unexplored. A convenient preparation strategy of stiff heterogeneous substrates is presented in this work, and the drop impact on such a stiffness-patterned substrate consisting of soft spirals surrounded by a rigid region is systematically investigated. The results show that the splash behavior of a drop on a stiffness-patterned substrate exhibits distinct characteristics from those on a homogeneous substrate. Prompt splash is more likely to occur on the substrate with the greater heterogeneity of stiffness, which is reflected in the lower critical impact velocity. Moreover, the splash velocity of emitted droplet is significantly larger on the heterogeneous substrate than that on a corresponding homogeneous substrate, especially at a higher impact velocity of the drop, indicating a stronger splash intensity on the heterogeneous substrate. The difference in drop splashing between homogeneous substrate and heterogeneous substrate is largely due to the stiffness heterogeneity, rather than the variation of overall stiffness of the substrate. The use of spiral shape provides a feasible solution for introducing stiffness heterogeneity of substrate. This study is conducive to the understanding of drop impact research beyond uniform substrates, reveals the potential of using stiffness-patterned substrates to control splash, and may find useful applications in industries related to drop impact and splash.
Keywords:  drop impact      stiffness-patterned substrate      splash  
Received:  15 December 2021      Revised:  15 February 2022      Accepted manuscript online:  10 March 2022
PACS:  47.55.D- (Drops and bubbles)  
  47.55.dr (Interactions with surfaces)  
  81.65.Cf (Surface cleaning, etching, patterning)  
  47.54.De (Experimental aspects)  
Fund: Project supported by the Natural Science Foundation Project of Chongqing, China (Grant No. CSTC2020jcyjmsxmX0106) and the Fundamental Research Funds for the Central Universities, China (Grant No. 2020CDJ-LHSS-002).
Corresponding Authors:  Guo Chen     E-mail:

Cite this article: 

Yang Cheng(成阳), Jian-Gen Zheng(郑建艮), Chen Yang(杨晨), Song-Lei Yuan(袁松雷), Guo Chen(陈果), and Li-Yu Liu(刘雳宇) Drop impact on substrates with heterogeneous stiffness 2022 Chin. Phys. B 31 084702

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Hu Hai-Bao (胡海豹), Huang Su-He (黄苏和), Chen Li-Bin (陈立斌). Chin. Phys. B, 2013, 22(8): 084702.
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