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Flow of liquid/liquid dispersions in a Hele-Shaw cell

Gandhi, KS and Basu, Suddhasatwa and Kumar, R (1997) Flow of liquid/liquid dispersions in a Hele-Shaw cell. In: Journal of Chemical Engineering of Japan, 30 (5). pp. 852-866.

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Official URL: http://www.jstage.jst.go.jp/article/jcej/30/5/30_8...

Abstract

Flow of liquid/liquid dispersions have been investigated in a Hele-Shaw cell which contained a thin disk held between two parallel plates. This device offers a well defined flow field and also permits visual observation of the dispersed drop movement. The dispersed drops coalesce with the disk for the systems where the dispersed phase wets the disk surface. The dispersed phase accumulate at the downstream end of the disk and they detach from there as blobs. Through an accurate measurement of accumulated dispersed phase volume, the coalescence rate was determined. The coalescence efficiency in the Hele Shaw cell is determined by dividing the coalescence hate by the undisturbed flow rate of the dispersed phase through an area equal to the projected area of the disk on a plane normal to the flow direction. The coalescence efficiency first increases and then decreases with the flow rate of dispersion. The coalescence rate/disk dimensions increases with the decrease in the disk dimensions. The rate of coalescence increases with the increase in the dispersed drop diameter and it decreases with the increase in the continuous phase viscosity. The presence of surfactants reduces the coalescence rate. All these results are quantitatively explained through a model, which takes into account several important features like various mechanism of drainage, the roles of dispersion and continuous phase viscosities, and the drop deformation.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Japan Science and Technology Information Aggregator, Electronic.
Department/Centre: Division of Mechanical Sciences > Chemical Engineering
Date Deposited: 19 Oct 2011 07:49
Last Modified: 19 Oct 2011 07:49
URI: http://eprints.iisc.ernet.in/id/eprint/38265

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