HYDRODYNAMIC CHANGES OF THE DEPLETION LAYER OF DILUTE POLYMER-SOLUTIONS NEAR A WALL

被引:38
作者
DEPABLO, JJ
OTTINGER, HC
RABIN, Y
机构
[1] UNIV SO CALIF,DEPT CHEM,LOS ANGELES,CA 90089
[2] SWISS FED INST TECHNOL,INST POLYMERE,CH-8092 ZURICH,SWITZERLAND
[3] BAR ILAN UNIV,DEPT PHYS,IL-59200 RAMAT GAN,ISRAEL
关键词
D O I
10.1002/aic.690380213
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The system studied in this work is a dilute solution of rod-like molecules under simple shear flow and near a hard wall. The time evolution of the probability density function is described by a diffusion equation; particle trajectories that correspond to this equation are generated by stochastic methods. Several algorithms are presented to handle the constraints imposed by the presence of the wall. In good agreement with recent experimental work on xanthan solutions, for high shear rates we observe an increase in the thickness of the depletion layer near the wall. For low to intermediate shear rates, however, we find a transient decrease of the depletion layer thickness that has not been observed experimentally. Based on the results of our simulations, we present a simple procedure to determine a few, well defined characteristic parameters from the experimental density profiles.
引用
收藏
页码:273 / 283
页数:11
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