S056033 ネマティック液晶のout-of-plane現象の数値解析([S05603]複雑流体の流動現象(3))

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Numerical simulations of director out-of-plane phenomena under nematic liquid crystalline shear flows between concentric cylinders have been performed. Three types of out-of-plane modes are found depending on the Ericksen number (Er), the curvature of the flow geometry, and the perturbation on the initial director profile, and they are (1) the steady state director profile with no twist angle, (2) the steady state director profile with 2n twist angle, and (3) the periodic director behavior. For Er=80, the probability of emergence of 2n-twist steady state mode is 1 for high curvature, and decrease with the decrease of the curvature by emerging the periodic director behavior mode. For the further decrease of the curvature, the probability of the emergence of 2n-twist steady state mode increase again. On the other hand, for rin=100mm(the radius of an inner cylinder), the probability of 0-twist steady state mode is 1 for low Er, and the probability of the 0-twist steady state mode decrease with increasing Er by increasing the probability of the 2n-twist steady state mode. Also, the sudden transition from the 2n-twist steady state to the periodic director behavior modes occurs between Er= 80 and 90.Key Words :
2011-09-11