Breakage of viscous and non-Newtonian drops in stirred dispersions

Lagisetty, JS and Das, PK and Kumar, R and Gandhi, KS (1986) Breakage of viscous and non-Newtonian drops in stirred dispersions. In: Chemical Engineering Science, 41 (1). pp. 65-72.

PDF http___www.sciencedirect.com_science__ob=MImg&_imagekey=B6TFK-444NWBW-5B-1&_cdi=5229&_user=512776&_orig=search&_coverDate=12%2F31%2F1986&_sk=999589998&view=c&wchp=dGLbVlb-zSkWz&md5=21ec187360eb26.pdf - Published Version Restricted to Registered users only Download (788kB) | Request a copy

Abstract

A model of breakage of drops in a stirred vessel has been proposed to account for the effect of rheology of the dispersed phase. The deformation of the drop is represented by a Voigt element. A realistic description of the role of interfacial tension is incorporated by treating it as a restoring force which passes through a maximum as the drop deforms and eventually reaching a zero value at the break point. It is considered that the drop will break when the strain of the drop has reached a value equal to its diameter. An expression for maximum stable drop diameter, dmax, is derived from the model and found to be applicable over a wide range of variables, as well as to data already existing in literature. The model could be naturally extended to predict observed values of dmax when the dispersed phase is a power law fluid or a Bingham plastic.

Item Type:	Journal Article
Publication:	Chemical Engineering Science
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Department/Centre:	Division of Mechanical Sciences > Chemical Engineering
Date Deposited:	03 Sep 2009 09:39
Last Modified:	19 Sep 2010 05:43
URI:	http://eprints.iisc.ac.in/id/eprint/22770

Actions (login required)

View Item