从上方加热的水平各向同性NH_3薄膜中的热对流结构动力学
Thermoconvective structure dynamics in horizontal Homeotropic Nematics films heated from above
摘要：
从上方加热的各向异性向列液晶对于大于$Δ$ Tc的所施加的热梯度呈现对流瑞利-贝纳德不稳定性。该阈值随着平行于初始分子取向（垂直）的外部磁场的强度而增加。我们研究了在阈值附近和远离阈值处存在的不同模式，如六边形和正方形，以及它们之间的过渡。远离阈值的模式演化研究表明，模式和全球系统动力学之间的共存。我们还研究了这种一般动力学如何随着细胞的倾斜度而变化，其中对于非常小的角度（1度），六边形和正方形被转化为卷。
英文摘要：
Homeotropic Nematic Liquid Crystal heated from above present convective Rayleigh-Benard instability for applied thermal gradients greater than $Δ$Tc. This threshold increase with the intensity of applied external magnetic field parallel to the initial molecular orientation (vertical). We studied the different patterns which exist near to and away from the threshold, such as hexagons and squares, and the transitions between them. The study of patterns evolution away the threshold shows coexistence between patterns and a global system dynamics. Also we studied how this general dynamics change with the inclination of the cell, where for very small angles (1 degree) the hexagons and squares are transformed into rolls.
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