平行平板間入口流れにおけるネマティック液晶のタンブリング挙動

概要

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Two-dimensional tumbling behavior is investigated numerically by calculating inlet flows of a tumbling-type nematic liquid crystal between parallel plates. Calculations are performed for various Ericksen numbers. At the comparatively small Ericksen number of Eγ = 10, the director in the upper half space of the channel rotates counter-clockwise before reaching the fully developed value. At Eγ=50, the director shows an abrupt rotation just after the inlet section. The rotation is not only convected to the downstream area but propagated from the region near the channel wall where shear rate is large to the center region. When Eγ is increased further to 100, the director profile does not indicate a monotonic development but a two-step one. In this case, the velocity profile in the main flow direction is wavelike. It is found that the effect of director orientation is strongly reflected on the velocity field, while the reverse effect is weak.
1995-07-25