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Role of the dynamic contact angle on splashing

Quetzeri-Santiago, Miguel A., Yokoi, Kensuke, Castrejón-Pita, Alfonso A. and Castrejón-Pita, J. Rafael 2019. Role of the dynamic contact angle on splashing. Physical Review Letters 122 (22) , 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
Additional Information: Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.
Publisher: American Physical Society
ISSN: 0031-9007
Date of First Compliant Deposit: 17 May 2019
Date of Acceptance: 4 May 2019
Last Modified: 01 Dec 2020 14:00
URI: http://orca.cardiff.ac.uk/id/eprint/122641

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