1120 ネマティック液晶の同心回転円板間流れの数値シミュレーション : タンブリング領域の移動について

概要

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Numerical simulation of nematic liquid crystalline flow between rotating parallel disks has been performed using the Leslie-Ericksen continuum theory. It is assumed that the director lies in the shear plane and that the velocity profile is linear in the gap direction of the two disks. For a tumbling-type liquid crystal both the two-dimensional analysis and the Carlsson's model, in which molecular field elasticity in the radial direction is ignored, can predict step-like changes of the director orientation angles in the radial direction at high Ericken numbers. However, the orientation angles are discontinuous at tumbling regions for the Carlsson's model, whereas they are continuous for the two-dimensional analysis. A peculiar behavior observed in a light intensity experiment reported by Carlsson et al. that dark rings move from the disk periphery to its center is satisfactorily simulated by the two-dimensional analysis.
2002-09-20