FLOW BEHAVIOR AND STABILITY OF OIL-IN-WATER EMULSIONS STABILIZED BY ASUCROSE PALMITATE

The steady-state flow behaviour of oil-in-water emulsions stabilized b y a sucrose palmitate was studied. Droplet size measurements were also carried out. The influence of sucrose ester (1-10% w/w) and oil conce ntrations (55-85% w/w) were analyzed. Influence of ageing was also stu died. The Sisko and Carreau models were used to fit the experimental r esults depending on oil concentration. A master flow curve was obtaine d for all the oil and sucrose ester concentrations studied. The result ing master curve may be described fairly well by using a form of the C arreau model which includes a shift factor for both oil and sucrose es ter concentration. The influence of the oil volume fraction on the shi ft factor was represented by a Frankel-Acrivos equation. A correlation between rheological properties and particle size parameters has also been established.