FLOW BEHAVIOUR AND STABILITY OF OIL‐IN‐WATER EMULSIONS STABILIZED BY A SUCROSE PALMITATE

Abstract

ABSTRACT The steady‐state flow behaviour of oil‐in‐water emulsions stabilized by a sucrose palmitate was studied. Droplet size measurements were also carried out. The influence of sucrose ester (1–10% w/w) and oil concentrations (55–85% w/w) were analyzed. Influence of ageing was also studied. The Sisko and Carreau models were used to fit the experimental results depending on oil concentration. A master flow curve was obtained for all the oil and sucrose ester concentrations studied. The resulting master curve may be described fairly well by using a form of the Carreau model which includes a shift factor for both oil and sucrose ester concentration. The influence of the oil volume fraction on the shift factor was represented by a Frankel‐Acrivos equation. A correlation between rheological properties and particle size parameters has also been established.