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Local dissipation limits the dynamics of impacting droplets on smooth and rough substrates
KTH, School of Engineering Sciences (SCI), Mechanics. Univ Oslo, Norway.ORCID iD: 0000-0002-5915-0789
KTH, School of Engineering Sciences (SCI), Mechanics, Physicochemical Fluid Mechanics. Sodertorn Univ, Sweden.ORCID iD: 0000-0003-3336-1462
2017 (English)In: PHYSICAL REVIEW FLUIDS, ISSN 2469-990X, Vol. 2, no 3, 033602Article in journal (Refereed) Published
Abstract [en]

A droplet that impacts onto a solid substrate deforms in a complex dynamics. To extract the principal mechanisms that dominate this dynamics, we deploy numerical simulations based on the phase field method. Direct comparison with experiments suggests that a dissipation local to the contact line limits the droplet spreading dynamics and its scaled maximum spreading radius beta(max). By assuming linear response through a drag force at the contact line, our simulations rationalize experimental observations for droplet impact on both smooth and rough substrates, measured through a single contact line friction parameter mu(f). Moreover, our analysis shows that dissipation at the contact line can limit the dynamics and we describe beta(max) by the scaling law beta(max) similar to (Re mu(l)/mu(f))(1/2) that is a function of the droplet viscosity (mu(l)) and its Reynolds number (Re).

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2017. Vol. 2, no 3, 033602
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-206290DOI: 10.1103/PhysRevFluids.2.033602ISI: 000399155400001OAI: oai:DiVA.org:kth-206290DiVA: diva2:1094279
Note

QC 20170509

Available from: 2017-05-09 Created: 2017-05-09 Last updated: 2017-05-09Bibliographically approved

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