Yavar Karimi - M.S. Student, Department of Chemical Engineering, University of Isfahan, Isfahan, Iran
Ali Reza Solaimany Nazar - Associate Professor, Department of Chemical Engineering, University of Isfahan, Isfahan, Iran

phenomenon changes the rheological behavior of waxy crude oil completely. In the current work, the rheological time-dependent and time-independent behaviors of waxy crude oil samples are studied and flow curve and compliance function are measured for the oil samples with various wax contents at different temperatures. A decrease in temperature and an increase in wax content lead to an increase in the viscosity and yield stress but a significant drop in compliance function. A modified Burger model is developed to predict the behavior of the compliance function and a modified Casson model is used to predict the flow curve of the waxy crude oil samples within a vast range of wax contents and temperatures. The proposed Burger and Casson models match with experimental results with R2 of 99.7% and 97.33% respectively.

Viscoelastic Properties, Rheological Model, Flow Curve1. IntroductionOne