Non-Newtonian steady shear flow characteristics of waxy crude oil
作者单位：Department of Engineering MechanicsShanghai Jiaotong University Department of Petroleum Storage and TransportationChina University of Petroleum State Key Laboratory of Fluid Power Transmission and ControlZhejiang University
会议名称：《The 9th National Conference on Rheology》
会议日期：2008年
学科分类：0820[工学-石油与天然气工程] 08[工学] 082003[工学-油气储运工程]
基 金：Project(07ZR14047) supported by the Natural Science Foundation of Shanghai China
关 键 词：waxy crude oil shear flow non-Newtonian flow generalized Newtonian model
摘 要：The experimental research on the non-Newtonian flow characteristic of a waxy crude oil was conducted through a rotational parallel-plates rbeometer *** test temperature is about 6.5℃ higher than its gel *** shear stress and viscosity of the waxy crude oil show sophisticate non-Newtonian characteristics in the shear rate of 10-10 s,in which the shear stress can be divided into three parts qualitatively,***-up region,leveling-off region,and stress-up *** indicates that there is a yielding process in shearing for the waxy crude oil at the experimental temperature,which is similar to the yield phenomenon in thixotropy-loop test discussed by CHANG and ***,the steady shear experiment alter the pre- shear process shows that the stress leveling-off region at low shear rate disappears for the waxy crude oil and the stress curve becomes a monotonic climbing one,which demonstrates that the internal structure property presenting through yielding stress at low shear rate can be changed by *** experimental results also show that the internal structure of waxy crude oil presenting at low shear rate has no influence on the shear viscosity obtained at the shear rate higher than *** generalized Newtonian model is adopted to describe the shear-thinning viscosity property of the waxy crude oil at high shear rate.