| 초록 |
We give a nonlinear numerical analysis of orientation texture formation of a nematic polymer (polybenzyl glutamate) during Plane Poiseuille flow. Leslie-Ericksen equation with finite element method has been used to obtain the time dependent orientation texture evolutions during Plane Poiseuille flow. Ericksen number, a characteristic ratio between viscous torque and elastic torque, and Reynolds number are very small in this study. Bounding surfaces have homeotropic anchoring condition in which average molecular orientation is perpendicular to the surface. Inlet and outlet have zero surface couple condition. As the flow rate increases orientation texture changes from uniform orientation to alternatively twisting orientation along the flow direction, which is similar to the shear flow case. Further flow rate increase results in herring-bone type orientation texture formation which is unlike the tubular orientation walls during shear flow. Detailed structural evolution stages and explanation about these exotic patterns will be given.
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