Author/Authors :
Samavati، Vahid نويسنده Department of Food Science and Engineering, Faculty of Agricultural Engineering and Technology, University of Tehran, Tehran, I.R. IRAN , , Emam-Djomeh، Zahra نويسنده , , Mohammadifar، Mohammad Amin نويسنده Department o Food Science, Faculty of Nutrition and Food Science, Shahid Beheshti University of Medical Sciences, Tehran, I.R. IRAN , , Omid، Mahmoud نويسنده Department of Food Science and Engineering, Faculty of Agricultural Engineering and Technology, University of Tehran, Tehran, I.R. IRAN , , Mehdinia، Ali نويسنده ,
Abstract :
Various scaling methods such as relative viscosity, Peclet and Reynolds scaling were used to find the best scaling law. Scaling and modeling of the ?ow curves of various model emulsions consist of Tragacanth Gum (TG) (0.5, 1 % wt), Oleic acid (5, 10% v/v) and WPI (2, 4 % wt)
were investigated and the best models were selected. As these emulsions are non-Newtonian,
they do not obey the usual, simple scaling laws. When the apparent viscosity is reduced to relative viscosity of the medium at zero shear rate, a distinct reduced ?ow curve is obtained, regardless of TG, oleic acid and WPI concentrations. This will lead to a technique of simplifying complex
non-Newtonian ?ow curves and therefore predicting the rheological ?ow curves and ?uid mechanics when different modi?ers are added to food emulsions. The flow behavior of all samples
was successfully modeled with Cross, power law and Ellis models and power law model was found as the better model to describe the flow behavior of dispersions. Results showed that both Gʹ and Gʹʹ increased with TG, oleic acid and WPI concentrations with pronounce effect of TG content.
