Breakage of viscous and non-Newtonian drops in stirred dispersions

✍ Scribed by J.S. Lagisetty; P.K. Das; R. Kumar; K.S. Gandhi

• Publisher: Elsevier Science
• Year: 1986
• Tongue: English
• Weight: 770 KB
• Volume: 41
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(86)85198-3

✦ Synopsis

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 interracial 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, d,.

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 d,, when the dispersed phase is a power law fluid or a Bingham plastic.