Apparent viscosity of p-methoxybenzylid ene-p'-n-butylaniline in the presence of el ectrohydrodynamic convection
Apparent viscosity of p-methoxybenzylid ene-p'-n-butylaniline in the presence of el ectrohydrodynamic convection
复制标题
电流体动力对流条件下对甲氧基苯甲基-对-正丁基苯胺的表观粘度
DOI：
10.1103/physreve.87.012501
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
and H. Orihara
中科院分区：
文献类型：
--
作者：
T. Nagaya;M. Niu;Y. H. Na;and H. Orihara
实验研究了电流体对流(EHC)条件下-甲氧基亚苄基-丁基苯胺的表观剪切粘度。在没有电场的情况下，导向器几乎沿着流动方向排列，使得粘度接近米索维奇粘度的最小值。由于 EHC 扰乱了流动对准导向器的配置，因此粘度随着低压状态下施加的电压的增加而增加。然而，在高电压状态下，进一步增加电压会导致粘度降低。使用流变仪的显微镜观察表明，粘度的降低发生在动态散射模式 2 (DSM2) 状态下，由于剪切流，其空间指向矢分布是各向异性的。通过采用Ericksen-Leslie理论来研究电场下的剪切流，我们发现粘度的降低可归因于DSM2态的各向异性指向矢分布引起的电应力的负贡献。
The apparent shear viscosity of-methoxybenzylidene---butylaniline in the presence of electrohydrodynamic convection (EHC) is investigated experimentally. In the absence of an electric field, directors are almost aligned along the flow direction such that the viscosity is close to the minimum of the Miesowicz viscosities. Since EHC disturbs the flow-aligned director configuration, the viscosity increases as the applied voltage is increased in the low-voltage regime. In the high-voltage regime, however, further increasing the voltage leads to a decrease in viscosity. Microscope observations using a rheometer reveal that the decrease in viscosity occurs in the dynamic scattering mode 2 (DSM2) state, whose spatial director distribution is anisotropic due to the shear flow. By adopting the Ericksen-Leslie theory for the shear flow under the electric field, we find that the viscosity decrease can be attributed to the negative contribution of the electric stress caused by the anisotropic director distribution of the DSM2 state.