Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session F11: Spreading and Evaporation of Binary Drops
8:00 AM–10:10 AM,
Monday, November 19, 2018
Georgia World Congress Center
Room: B216
Chair: Justin Burton, Emory University
Abstract ID: BAPS.2018.DFD.F11.7
Abstract: F11.00007 : Spreading and evaporation of sessile drops comprising binary mixtures*
9:18 AM–9:31 AM
Presenter:
Adam G L Williams
(University of Edinburgh)
Authors:
Adam G L Williams
(University of Edinburgh)
George Karapetsas
(Aristotle University of Thessaloniki)
Pedro J Saenz
(Massachusetts Inst of Tech-MIT)
Omar K Matar
(Imperial College London)
Khellil Sefiane
(University of Edinburgh)
Prashant Valluri
(University of Edinburgh)
Spreading and evaporation of a binary mixture sessile drop from a heated substrate is a complex process governed by the delicate balance between capillary stresses, evaporation, hydrodynamic flow, mass diffusion and surface tension, with both thermal and solutal Marangoni stresses present. We examine the behaviour and stability of volatile wetting ethanol-water drops deposited onto heated substrates using both experimental and modelling approaches. Our one-sided model uses lubrication theory to obtain a base state which we then perturb and assess the stability using a linear stability analysis evoking the quasi-steady-state approximation. Evolution equations are derived for the film height, temperature and concentration field assuming that the mixture comprises two ideally mixed volatile components with surface tension linearly dependent on temperature and concentration. Contact line movement is permitted by releasing the drop over a precursor film, avoiding the singularity at the contact line. Our simulations and experiments indicate that concentration gradients give rise to super-spreading and contact line instabilities, not previously seen in pure fluids. Results from our model qualitatively and quantitatively agree with experiments.
*EC-H2020-RISE-ThermaSMART-778104 and EPSRC
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.F11.7
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