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 Q11: Drop Impact on Solids II
12:50 PM–3:26 PM,
Tuesday, November 20, 2018
Georgia World Congress Center
Room: B216
Chair: Xiang Cheng, University of Minnesota, Twin Cities
Abstract ID: BAPS.2018.DFD.Q11.3
Abstract: Q11.00003 : Impact of Leidenfrost Drops on Spherical Targets*
1:16 PM–1:29 PM
Presenter:
John Sharer Allen
(University of Hawaii Manoa)
Authors:
John Sharer Allen
(University of Hawaii Manoa)
Mitchel McLean
(Univ of Hawaii Manoa)
The impact of Leidenfrost drops on planar surfaces has been an on-going topic of research. However, the impingement of these drops on spherical targets is less understood despite its important implications for petroleum processing such as in fluid catalytic cracking. In this work, an experimental system was designed to heat metallic targets beyond the Leidenfrost temperature for drop impingement studies. Water drops with Weber numbers ranging from 10 to 45 were impinged on planar and spherical targets with temperatures from 160 °C to 220 °C. Impinging drops covered a larger surface area on a spherical compared to a planar surface. In addition, it was observed that the Leidenfrost temperature depended on the ratio of the drop diameter to the spherical target diameter. For Weber numbers from 10 to 15, drops were observed to rebound off the target. At Weber numbers from 15 to 30, liquid hole formation was observed and analyzed. For greater Weber numbers and temperatures, liquid toroids developed. The toroidal drop dynamics were measured with high speed photography and these results were compared with existing models for planar surfaces. The toroids broke up into a discrete number of smaller drops as a result of a Plateau-Rayleigh instability.
*NSF Grant #1542764
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.Q11.3
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