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A new characteristic of liquid–liquid systems—inversion holdup of intensely agitated dispersions

Deshpande, Kiran B and Kumar, Sanjeev (2003) A new characteristic of liquid–liquid systems—inversion holdup of intensely agitated dispersions. In: Chemical Engineering Science, 58 (16). pp. 3829-3835.

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Abstract

As the holdup of dispersed phase in an agitated liquid–liquid dispersion is increased at fixed agitation, a point is reached (called inversion holdup) when the dispersion inverts—the dispersed phase becomes continuous and vice versa. In this work, we present experimental data which suggest that the inversion holdup for sufficiently intense turbulence is independent of all the operational parameters associated with a stirred tank, e.g., stirrer speed, vessel volume, impeller size, and impeller type; it depends only on the properties of the liquid–liquid system. The inversion holdup was verified to remain unchanged even for inversion in turbulent flow field in the annular space between two coaxial cylinders. A hypothesis involving drops in near contact with each other at high holdups is used to explain the experimental data. The new finding may also provide a qualitative basis for selecting a liquid–liquid system with desired extent of mixing in the dispersed phase for carrying out transport and reactions in multiphase systems.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier
Keywords: Liquid–liquid dispersion;Multiphase systems;Phase inversion; Turbulent flowfield
Department/Centre: Division of Mechanical Sciences > Chemical Engineering
Date Deposited: 28 Jun 2007
Last Modified: 19 Sep 2010 04:38
URI: http://eprints.iisc.ernet.in/id/eprint/11076

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