Effect of viscosity on the dynamics of a spark-generated non-equilibrium bubble in free-field and near a free-surface

Kannan, Y S and B, Saravanan and Karri, Badarinath and Sahu, Kirti Chandra (2017) Effect of viscosity on the dynamics of a spark-generated non-equilibrium bubble in free-field and near a free-surface. In: 70th Annual Meeting of the APS Division of Fluid Dynamics, November 19–21, 2017, Denver, Colorado.

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Abstract

The effect of viscosity on the behaviour of a spark-generated non-equilibrium bubble is investigated experimentally. In specific, the dynamics of the bubble in two scenarios, namely, when the bubble is generated in the bulk of the fluid (``free-field'' bubble) and when the bubble is generated near a free-surface (``free-surface'' bubble) are investigated. The bubble is created using a low-voltage spark circuit and its dynamics is captured using a high speed camera with back-lit illumination. The viscosity of the surrounding medium is varied by using different grades of silicone oil. It is observed that for a ``free-field'' bubble, the bubble oscillates radially and with an increase in the viscosity of the liquid, both the number of oscillations as well as time period of each oscillation are increased. For ``free-surface'' bubbles, our experiments reveal a variety of distinctive bubble and re-entrant jet behaviours as the initial distance of the bubble from the free-surface and the viscosity of the surrounding fluid are varied. It is observed that beyond a certain initial distance of the bubble from the free surface, the bubble behaves as a ``free-field'' bubble.This limiting initial distance is observed to decrease as the viscosity increases.

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IITH Creators:
IITH CreatorsORCiD
B, SaravananUNSPECIFIED
Karri, BadarinathUNSPECIFIED
Sahu, Kirti Chandrahttp://orcid.org/0000-0002-7357-1141
Item Type: Conference or Workshop Item (Paper)
Subjects: Physics > Fluid mechanics
Divisions: Department of Chemical Engineering
Department of Mechanical & Aerospace Engineering
Depositing User: Team Library
Date Deposited: 28 Sep 2017 04:01
Last Modified: 16 Jan 2018 10:19
URI: http://raiithold.iith.ac.in/id/eprint/3584
Publisher URL:
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