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Bouncing drop impingement on heated hydrophobic surfaces

Samkhaniani, N. ORCID iD icon 1; Stroh, A. 1; Holzinger, M.; Marschall, H.; Frohnapfel, B. ORCID iD icon 1; Wörner, Martin ORCID iD icon 2
1 Institut für Strömungsmechanik (ISTM), Karlsruher Institut für Technologie (KIT)
2 Institut für Katalyseforschung und -technologie (IKFT), Karlsruher Institut für Technologie (KIT)


We extend a diffuse interface phase-field method for two-phase flow simulations so as to include interfacial heat transfer and the thermal Marangoni effect. The set of governing equations hold non-standard terms, which originally stem from the underlying variational consideration of the total free energy of the two-phase system. It consists of the coupled Cahn-Hilliard Navier-Stokes equations with a temperature-dependent mixing energy term and a temperature transport equation implemented in the OpenFOAM framework. The underlying solver phaseFieldFoam is validated for the test cases of thermocapillary convection in a two-fluid-layer and thermocapillary migration of a drop.

In the main part of the paper, hydrodynamics and heat transfer of a droplet impinging on a heated hydrophobic surface with subsequent bouncing are studied in detail. By comprehensive simulations, the effects of impact velocity, droplet diameter (in mm range) and substrate wettability (contact angle) are investigated. The numerical results for spreading ratio, wall contact time and cooling effectiveness are found to compare well with experiments indicating that the developed code is well suited for heat transfer simulation in two-phase flow. ... mehr

DOI: 10.1016/j.ijheatmasstransfer.2021.121777
Zitationen: 28
Web of Science
Zitationen: 24
Zitationen: 27
Zugehörige Institution(en) am KIT Institut für Katalyseforschung und -technologie (IKFT)
Institut für Strömungsmechanik (ISTM)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 12.2021
Sprache Englisch
Identifikator ISSN: 0017-9310
KITopen-ID: 1000136039
HGF-Programm 38.03.02 (POF IV, LK 01) Power-based Fuels and Chemicals
Erschienen in International journal of heat and mass transfer
Verlag Elsevier
Band 180
Seiten Art.-Nr.: 121777
Projektinformation SFB/TRR 150/2 (DFG, DFG KOORD, TRR 150/2 2019)
Schlagwörter Drop impingement; Heat transfer; Maximum spreading ratio; Contact time; Thermocapillary; Phase field method; Openfoam
Nachgewiesen in Scopus
Web of Science
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