The Droplet Population Balance Model — Estimating of Breakage and Coalescence

✍ Scribed by M. Simon; H.-J. Bart

• Publisher: John Wiley and Sons
• Year: 2001
• Tongue: German
• Weight: 60 KB
• Volume: 73
• Category: Article
• ISSN: 0009-286X
• DOI: 10.1002/1522-2640(200106)73:6<741::aid-cite7411111>3.0.co;2-#

✦ Synopsis

Large variety of multiphase systems is treated in dispersing operations in order to generate a well defined disperse microstructure. Beside material properties as viscosity and interfacial tension, the ratio of shear and elongational forces in the flow field is of importance. In this paper we focus on the deformation and disruption of droplets in specially designed flow cells that allows to control the flow stresses acting on the droplets. The presents of surfactants or emulsifiers at the interface of the droplets influence the deformation and eventually the break-up of the aggregates. To study the quiescent and transient rheology and morphology of such interfacial films and the resulting drop properties Brewster angle microscopy and interfacial rheometry are used. The obtained information on the structure and rheology provides insight into molecular and organization at the interface and, therefore on emulsification processes.