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 G09: Bubbles: Growth, Heat Transfer and Boiling II
10:35 AM–12:45 PM,
Monday, November 19, 2018
Georgia World Congress Center
Room: B214
Chair: Alexander Yarin, University of Illinois, Chicago
Abstract ID: BAPS.2018.DFD.G09.4
Abstract: G09.00004 : An approximate analytical solution for bubble departure diameter in a vertical boiling channel*
11:14 AM–11:27 AM
Presenter:
Swapan Paruya
(National Institute of Technology Durgapur, West Bengal, India -713209)
Authors:
Swapan Paruya
(National Institute of Technology Durgapur, West Bengal, India -713209)
Jyoti Bhati
(National Institute of Technology Durgapur, West Bengal, India -713209)
Subramaniam Pushpavanam
(Indian Institute of Technology Madras, Chennai, Tamil Nadu, India - 600036)
This simplified analytical solution for bubble departure diameter was derived in the connection to the need of determining bubble inclination angle, which the existing literature lacks. A large number of correlations for the departure diameter are currently in use for large-scale numerical simulation of boiling flows in channels. However, while solving for the bubble departure diameter numerically, we found that the choice of a proper bubble inclination angle was very crucial. The solution is based on the force balance that considers the major contribution of buoyancy force and growth force. Of course, the surface tension plays a little role at the time of bubble departure. The growth kinetics we used are our own asymptotic solution and those from the literature. The analytical solutions for the departure diameter and the growth time have been compared with our numerical solutions, the existing correlations and our experiments for different superheats (Jakob number Ja) and pressures. Our analytical solution is found to be reasonably accurate in high Ja. An appreciable deviation from the numerical simulation and some experiments in low Ja suggests that the contribution of micro-layer evaporation is important.
*Department of Science and Technology, New Delhi, India.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.G09.4
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