Start-up flow of a yield-stress fluid in a vertical pipe

被引:19
|
作者
Liu, Yang [1 ]
de Bruyn, John R. [1 ]
机构
[1] Univ Western Ontario, Dept Phys & Astron, London, ON N6A 3K7, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
Yielding; Yield-stress fluid; Start-up flow; WAXY CRUDE OILS; STICK-SLIP TRANSITION; WEAKLY COMPRESSIBLE FLOW; RHEOLOGICAL BEHAVIOR; WALL-SLIP; NUMERICAL-SIMULATION; BINGHAM FLUID; MODEL; PIPELINES; RESTART;
D O I
10.1016/j.jnnfm.2018.03.005
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
We have investigated the start-up flow and yielding of a simple yield-stress fluid (Carbopol 940) in a vertical pipe. The Carbopol was displaced from below by a Newtonian liquid (Fluorinert FC-40) injected at the bottom of the pipe. Rough and smooth-walled pipes were used to study the effects of wall boundary conditions. The shear stress at the wall was known from the pressure in the Carbopol measured by a pressure gauge fixed on the pipe wall. The shear rate was known from measurements of velocity profile in the Carbopol made using particle image velocimetry. In the rough-walled pipe, the yielding involved a long transit with several steps: elastic deformation, the onset of wall slip, yielding at the wall, and finally a steady-state plug flow that is well-described by the predictions of the Herschel-Bulkley model. In contrast, in the smooth-walled pipe, the wall shear stress never exceeded the yield stress. Our results demonstrate the importance of elasticity during the yielding process, particularly for faster displacements.
引用
收藏
页码:50 / 58
页数:9
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