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Non-newtonian steady shear flow characteristics of waxy crude oil

Non-Newtonian steady shear flow characteristics of waxy crud...

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The 9th National Conference on Rheology

作者：黄树新陈鑫鲁传敬侯磊范毓润 Department of Engineering Mechanics Shanghai Jiaotong University Department of Petroleum Storage and Transportation China University of Petroleum State Key Laboratory of Fluid Power Transmission and Control Zhejiang University

The experimental research on the non-newtonian flow characteristic of a waxy crude oil was conducted through a rotational parallel-plates rbeometer system.The test temperature is about 6.5℃ higher than its gel point.The 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,i.***.stress-up region,leveling-off region,and stress-up region.This 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 BOGER.Furthermore,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 shearing.The 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 0.1s.The generalized newtonian model is adopted to describe the shear-thinning viscosity property of the waxy crude oil at high shear rate.

关键词： waxy crude oil shear flow non-newtonian flow generalized newtonian model

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