Prediction and observation of sustained oscillations in a sheared liquid crystalline polymer

被引:33
作者
Grosso, M
Crescitelli, S
Somma, E
Vermant, J
Moldenaers, P
Maffettone, PL
机构
[1] Univ Naples Federico 2, Dipartimento Ingn Chim, I-80125 Naples, Italy
[2] Katholieke Univ Leuven, Dept Chem Engn, B-3001 Louvain, Belgium
[3] Politecn Torino, Dipartimento Sci Mat & Ingn Chim, I-10129 Turin, Italy
关键词
D O I
10.1103/PhysRevLett.90.098304
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Experimental observations of sustained oscillations of both shear stress and first normal stress differences are reported in flowing liquid crystalline polymers in a limited range of shear rates. The results can be described by considering the response of a rigid-rod model. Depending on the initial conditions, the frequency spectrum of the stress signal contains either one or two characteristic frequencies. This can be explained by the occurrence of either pure "wagging" or the coexistence of wagging and "log-rolling" behavior of the director.
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页数:4
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