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 M12: Drops: Spreading on Soft Surfaces
8:00 AM–10:10 AM,
Tuesday, November 20, 2018
Georgia World Congress Center
Room: B217
Chair: Karen Daniels, North Carolina State University
Abstract ID: BAPS.2018.DFD.M12.3
Abstract: M12.00003 : Spreading and sliding of viscous droplets on soft substrates under external body forces
8:26 AM–8:39 AM
Presenter:
Md Ehsanul Alam
(Institute for Technical Thermodynamics, Technische Universitӓt Darmstadt)
Authors:
Md Ehsanul Alam
(Institute for Technical Thermodynamics, Technische Universitӓt Darmstadt)
Inmaculada Ríos-López
(Division of Chemical Technology, School of Chemistry, Aristotle University, Thessaloniki)
Thodoris D. Karapantsios
(Division of Chemical Technology, School of Chemistry, Aristotle University, Thessaloniki)
Tatiana Gambaryan-Roisman
(Institute for Technical Thermodynamics, Technische Universitӓt Darmstadt)
The deformability of substrates is known to significantly affect the wetting phenomena. In this experimental work, we investigate the influence of the substrate mechanical properties on the deformation and onset of sliding of a sessile droplet under increasing centrifugal force. The dependence of contact angle at the advancing and the receding edge of the droplet in the direction of the applied force, the drop length and the contour shape on the applied force is analysed. Theoretical models are validated against the obtained results to understand the underlying physical phenomena. The experimental setup used for this study is a custom made state of the art device equipped with a rotating arm, tilting head and an environmental chamber. Three cameras placed at right angles to each other give the side, top and back view of the drop. A custom made Matlab script facilitates the post processing of the video images. Polydimethylsiloxane (PDMS) is used as the substrate and water and 50 wt% glycerine solution as the wetting liquids. Drops on softer surfaces showed large hysteresis as compared to drops on the harder substrates. It is also shown that, by increasing the viscosity of the drop the force required to slide the drop on the softer surfaces is reduced.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.M12.3
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