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The role of the dynamic contact angle on splashing

Quetzeri-Santiago, Miguel A., Yokoi, Kensuke, Castrejón-Pita, Alfonso A. and Castrejón-Pita, J. Rafael 2019. The role of the dynamic contact angle on splashing. Physical Review Letters 122 , 228001. 10.1103/PhysRevLett.122.228001

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Abstract

In this letter we study the splashing behaviour of droplets upon impact onto a variety of substrates with different wetting properties, ranging from hydrophilic to super-hydrophobic surfaces. In particular, we study the effects of the dynamic contact angle on splashing. The experimental approach uses high-speed imaging and image analysis to recover the apparent contact angle as a function of the spreading speed. Our results show that neither the Capillary number nor the so-called splashing parameter are appropriate to characterise the splashing behaviour under these circumstances. However, we show that the maximum dynamic advancing contact angle and the splashing ratio β adequately characterise the splashing behaviour.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Publisher: American Physical Society
ISSN: 0031-9007
Date of First Compliant Deposit: 17 May 2019
Date of Acceptance: 4 May 2019
Last Modified: 11 Jun 2019 09:16
URI: http://orca-mwe.cf.ac.uk/id/eprint/122641

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