Droplet break-up in a stirred water-in-oil emulsion in the presence of emulsifiers

F. Groeneweg, F. Dieren, van, W.G.M. Agterof

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Abstract

Scaling laws for droplet break-up in stirred emulsifier-contg. water-in-oil emulsions with emulsifier vol. fractions up to 70% were evaluated. The emulsions were stirred with a std. turbine impeller and the droplet diams. were detd. as a function of time both microscopically and via turbidity measurements. The droplet size was found to decrease very slowly: a steady state was reached after 1-2h. In emulsions without emulsifier the steady state droplet diams. were found to be in agreement with predicted values. Emulsions with emulsifier showed a bimodal size distribution with a very large no. of very small droplets. The av. diam. of the \"coarse part\" of the size distribution could be described reasonably well with the droplet break-up relationships provided that the equil. interfacial tension was applied, indicating that the transport of emulsifier was sufficiently fast to maintain (nearly) equil. adsorption during the deformation of the droplet. The very small droplets could possibly be formed by tip streaming: the flow pushes the emulsifier to the tips of the droplet, resulting in a very low interfacial tension locally which leads to a stream of very small droplets. [on SciFinder (R)]
Original languageEnglish
Pages (from-to)207-214
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume91
Issue number1-2
DOIs
Publication statusPublished - 1994

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