Energy exchange analysis in droplet dynamics via the Navier–Stokes–Cahn–Hilliard model

Luis Espath, Adel Sarmiento, Philippe Vignal, B. O. N. Varga, Adriano Mauricio Cortes, Lisandro Dalcin, Victor M. Calo

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

We develop the energy budget equation of the coupled Navier-Stokes-Cahn-Hilliard (NSCH) system. We use the NSCH equations to model the dynamics of liquid droplets in a liquid continuum. Buoyancy effects are accounted for through the Boussinesq assumption. We physically interpret each quantity involved in the energy exchange to gain further insight into the model. Highly resolved simulations involving density-driven flows and the merging of droplets allow us to analyse these energy budgets. In particular, we focus on the energy exchanges when droplets merge, and describe flow features relevant to this phenomenon. By comparing our numerical simulations to analytical predictions and experimental results available in the literature, we conclude that modelling droplet dynamics within the framework of NSCH equations is a sensible approach worthy of further research. © 2016 Cambridge University Press.
Original languageEnglish (US)
Pages (from-to)389-430
Number of pages42
JournalJournal of Fluid Mechanics
Volume797
DOIs
StatePublished - May 23 2016

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