Dispersion coalescence: Kinetic stability of creamed dispersions
- Illinois Inst. of Tech., Chicago (United States)
A model is developed to predict the coalescence behavior in liquid-liquid dispersions. Coalescence times are based on the lifetimes of the single films that are formed between adjoining drops in a creamed or sedimented dispersion. The model is developed for smaller drop sized dispersions (< 100[mu]m) in which the drops are not substantially deformed due to gravitational forces. The model predicts that coalescence occurs between the emulsion drops without the gross separation of the dispersed phase (that is, the dispersion does not separate into distinct oil and water phases). As a result of interdrop coalescence, the mean drop size of the dispersed phase increases along with an increase in the polydispersity of the drop size. The model's predictions are used to develop a quantitative relationship between the lifetime of the single film and the rate of increase of the mean drop size of the dispersion. The model also accounts for the effect of surfactant on dispersion stability via the models of single film drainage in the presence of surfactant.
- OSTI ID:
- 6487018
- Journal Information:
- AIChE Journal (American Institute of Chemical Engineers); (United States), Journal Name: AIChE Journal (American Institute of Chemical Engineers); (United States) Vol. 39:2; ISSN 0001-1541; ISSN AICEAC
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400201* -- Chemical & Physicochemical Properties
COALESCENCE
COLLOIDS
DISPERSIONS
DROPLETS
EMULSIONS
HYDROGEN COMPOUNDS
KINETICS
MATHEMATICAL MODELS
OILS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PARTICLES
SIZE
STABILITY
SURFACTANTS
TIME DEPENDENCE
WATER