Numerical simulations of bubble formation from submerged needles under non-uniform direct current electric field

Sunder, Shyam and Tomar, Gaurav (2013) Numerical simulations of bubble formation from submerged needles under non-uniform direct current electric field. In: PHYSICS OF FLUIDS, 25 (10).

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Abstract

In several chemical and space industries, small bubbles are desired for efficient interaction between the liquid and gas phases. In the present study, we show that non-uniform electric field with appropriate electrode configurations can reduce the volume of the bubbles forming at submerged needles by up to three orders of magnitude. We show that localized high electric stresses at the base of the bubbles result in slipping of the contact line on the inner surface of the needle and subsequent bubble formation occurs with contact line inside the needle. We also show that for bubble formation in the presence of highly non-uniform electric field, due to high detachment frequency, the bubbles go through multiple coalescences and thus increase the apparent volume of the detached bubbles. (C) 2013 AIP Publishing LLC.

Item Type:	Journal Article
Publication:	PHYSICS OF FLUIDS
Publisher:	AMER INST PHYSICS
Additional Information:	Copyright for this article belongs to the American Institute of Physics
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	16 Dec 2013 06:38
Last Modified:	16 Dec 2013 06:38
URI:	http://eprints.iisc.ac.in/id/eprint/47898

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