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 D13: Drop Impact on Liquids
2:30 PM–4:40 PM,
Sunday, November 18, 2018
Georgia World Congress Center
Room: B218
Chair: David Brutin, Aix-Marseille University
Abstract ID: BAPS.2018.DFD.D13.1
Abstract: D13.00001 : Dynamics of Droplet Impingement on Liquid Infused Surfaces: Tuning Surfaces for Simultaneous Reduction of Rebound and Hysteresis
2:30 PM–2:43 PM
Presenter:
Saumyadwip Bandopadhyay
(Advanced Technology Development Centre, Indian Institute of Technology Kharagpur, Kharagpur, India, 721302)
Authors:
Saumyadwip Bandopadhyay
(Advanced Technology Development Centre, Indian Institute of Technology Kharagpur, Kharagpur, India, 721302)
Chirodeep Bakli
(School of Energy Science and Engineering, Indian Institute of Technology Kharagpur, Kharagpur, India, 721302)
Rabibrata Mukherjee
(Department of Chemical Engineering, Indian Institute of Technology Kharagpur, Kharagpur, India, 721302)
Suman Chakraborty
(Department of Mechanical Engineering, Indian Institute of Technology Kharagpur, Kharagpur, India, 721302)
The development of liquid infused slippery surfaces has opened up new arenas in manoeuvrable surfaces. The liquid film infused on these surfaces imparts a dissipative viscous damping to any applied force, giving them ability to withstand shear and self-heal. We study the dynamic properties of such surfaces via droplet impingement exploring the stress response and contact angle hysteresis (CAH) with varying viscosity of the infused oil. We explore these substrates to minimize rebound, a phenomenon commonly associated with superhydrophobic surfaces and to maximize capillary wave suppression. Using experimental results supported by numerical analysis, we develop a framework for surfaces with high capability to withstand shear from incoming droplet or jet and at the same time providing minimum CAH under transient and steady state. The droplet dynamics post impact is modelled by considering inertial, capillary and viscous forces and the alteration of behaviour from one surface to another is attributed to a competition of asymmetrical interfacial slip at the contact line contributed from the viscous term and the capillary force due to the evolving sessile droplet. Surfaces with such capabilities find immense application in microelectronic cooling and droplet based microfluidic systems.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.D13.1
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