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 D08: Bubbles: General
2:30 PM–4:40 PM,
Sunday, November 18, 2018
Georgia World Congress Center
Room: B213
Chair: Badarinath Karri, Indian Institute of Technology, Hyderabad
Abstract ID: BAPS.2018.DFD.D08.2
Abstract: D08.00002 : Scaling Laws for Freezing Bubbles
2:43 PM–2:56 PM
Presenter:
Farzad Ahmadi
(Virginia Tech)
Authors:
Farzad Ahmadi
(Virginia Tech)
Christian Kingett
(Virginia Tech)
Saurabh Nath
(Virginia Tech)
Pengtao Yue
(Virginia Tech)
Jonathan Boreyko
(Virginia Tech)
We deposit bubbles on an icy substrate and model the dynamics of the resulting freeze front using scaling analysis. First, the substrate temperature was ranged from -10 °C to -40 °C using a Peltier stage in a room temperature environment. The freeze front was modeled as a one-dimensional Stefan problem; the latent heat of fusion was balanced by the net difference in thermal conduction across the frozen and unfrozen portions of the bubble. For most bubbles, the freeze front stopped progressing entirely at a critical height where conduction across the ice and liquid were balanced. Second, freezing bubbles were observed under isothermal conditions in a walk-in freezer set to -20 °C. With the bubble initially exhibiting a uniform temperature, the latent heat of fusion now induces a Marangoni flow going up the bubble that detaches and entrains ice particles. These flowing ice particles continue to grow, resulting in multiple freeze fronts that interlock together like hexagons on a soccer ball.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.D08.2
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