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 G12: Leidenfrost and Levitating Drops
10:35 AM–12:45 PM,
Monday, November 19, 2018
Georgia World Congress Center
Room: B217
Chair: Yoshiyuki Tagawa, Tokyo University of Agriculture and Technology
Abstract ID: BAPS.2018.DFD.G12.10
Abstract: G12.00010 : Experimental study on pressure balance of a droplet levitating over a moving wall*
12:32 PM–12:45 PM
Presenter:
Yoshiyuki Tagawa
(Tokyo Univ of Agri & Tech)
Authors:
Yoshiyuki Tagawa
(Tokyo Univ of Agri & Tech)
Ayumi Matsuda
(Tokyo Univ of Agri & Tech)
Erina Sawaguchi
(Tokyo Univ of Agri & Tech)
We experimentally investigate droplet levitation over a moving glass wall in a steady state. The droplet is supported by the lubrication pressure in an air film of µm thickness between the moving wall and the droplet. The previous theoretical consideration indicated that the lubrication pressure and the bottom shape of the deformable droplet are mutually determined. However, there is little experimental validation of the pressure balance on the droplet surface, which is essential in levitating droplet problems. To verify pressure balance experimentally, this study measures three-dimensional shape of the air film, including mean curvature distribution of the surface, and calculate pressure distribution of the levitating droplet. Remarkably the lubrication pressure is found to balance with the surface tension and hydrostatic pressure. We also verify that the lift force, integral of the lubrication pressure, balances with the gravity force acting on the droplet. In addition, we provide new information based on the investigation of several parameters, especially the droplet viscosity varied over two orders magnitude.
*This work was supported by JSPS KAKENHI Grant Number 17H01246 and JSPS Strategic Young Researcher Overseas Visits Program for Accelerating Brain Circulation.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.G12.10
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