S Liwa Izabela, Zakharov A V
Poznan University of Economics and Business, Al. Niepodleglosci 10, 61-875, Poznan, Poland.
Saint Petersburg Institute for Machine Sciences, The Russian Academy of Sciences, 199178, Saint Petersburg, Russia.
Eur Phys J E Soft Matter. 2020 May 27;43(5):29. doi: 10.1140/epje/i2020-11953-0.
Nonmechanical fluid pumping principle has been developed utilizing the interactions of both the director [Formula: see text] and velocity v fields and temperature T redistribution across a two-dimensional homogeneously-aligned nematic (HAN) microfluidic channel under the influence both of a heat flux [Formula: see text] and the surface electric field E, originating from the surface charge density [Formula: see text]. The heat flux [Formula: see text] is caused by the laser beam pulse focused on the channel's boundary, whereas the normally directed electric field is due to electric double layers, that is naturally created within the liquid crystal near a charged surface. Calculations, based upon the nonlinear extension of the classical Ericksen-Leslie theory, with accounting the entropy balance equation, show that due to the coupling between the [Formula: see text] and [Formula: see text], in the HAN microfluidic channel the vortical flow [Formula: see text] may be excited. The direction and magnitude of [Formula: see text] is influenced by [Formula: see text] and E, as well as by the thickness of the HAN microfluidic channel.
利用指向矢[公式：见原文]和速度v场的相互作用以及在热通量[公式：见原文]和源于表面电荷密度[公式：见原文]的表面电场E的影响下，二维均匀排列向列相（HAN）微流控通道内的温度T重新分布，开发了非机械流体泵送原理。热通量[公式：见原文]由聚焦在通道边界上的激光束脉冲引起，而法向电场则归因于电双层，其在带电表面附近的液晶内自然形成。基于经典埃里克森 - 莱斯利理论的非线性扩展并考虑熵平衡方程的计算表明，由于[公式：见原文]和[公式：见原文]之间的耦合，在HAN微流控通道中可能会激发涡旋流[公式：见原文]。[公式：见原文]的方向和大小受[公式：见原文]和E以及HAN微流控通道厚度的影响。
