سال انتشار: ۱۳۸۵

محل انتشار: ششمین همایش ملی دانشجویی مهندسی شیمی و پنجمین همایش ملی دانشجویی مهندسی نفت

تعداد صفحات: ۹

نویسنده(ها):

بابک درخشنده – Department of Chemical and Petroleum Engineering Sharif University of Technology
محمّد عسکری – Department of Chemical and Petroleum Engineering Sharif University of Technology
احمد رمضانی – Department of Chemical and Petroleum Engineering Sharif University of Technology

چکیده:

Water and oil can make emulsions. Oil in water and water in oil emulsions have the same behavior in general but
there are less information about water in oil emulsions. Rheological properties of these systems are very
important. In this research we made different samples with different characteristics, some of them had surfactant
and others without it. Then we investigated the different rheological properties of such systems. We measure
viscosity variation of such systems versus shear rate variations, different water volume fractions and effect of
adding surfactants to these systems. It is shown that these systems have a Newtonian viscosity below a certain
shear rate and pseudo plastic behavior above that. Relative viscosity increases by increasing water volume
fraction but after a certain value it increases sharply until it goes to infinity at a certain value. Our investigations
showed that elastic modulus is low in moderate water volume fractions after a certain volume fraction elastic
modulus increases sharply that shows there is a phase transition. Moreover, we find loss and storage modulus
variations versus shear rate variations. In all cases G’ showed a linear behavior and then a nonlinear behavior
after that.