Abstract.

Nonmechanical fluid pumping principle has been developed utilizing the interactions of both the director \( \hat{\mathbf{n}}\) 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 \( \mathbf{q}\) and the surface electric field E₀, originating from the surface charge density \( \sigma\). The heat flux \( \mathbf{q}\) 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 \( \nabla T\) and \( \nabla\hat{\mathbf{n}}\), in the HAN microfluidic channel the vortical flow \( \mathbf{v}\) may be excited. The direction and magnitude of \( \mathbf{v}\) is influenced by \( \mathbf{q}\) and E₀, as well as by the thickness of the HAN microfluidic channel.

Graphical abstract

中文翻译：

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在均匀排列的微流向列通道中产生流的非机械原理。

摘要。

非机械流体抽运原理是利用导向器\（\ hat {\ mathbf {n}} \）和速度v场以及温度T在二维均匀排列向列（HAN）微流体通道上的重新分布共同作用而开发的源于表面电荷密度\（\ sigma \）的热通量\（\ mathbf {q} \）和表面电场E _0的影响。热通量\（\ mathbf {q} \）这是由于聚焦在通道边界上的激光束脉冲引起的，而通常指向的电场是由于双电层而产生的，而双电层是在带电表面附近的液晶中自然产生的。基于经典Ericksen-Leslie理论的非线性扩展，并考虑了熵平衡方程，计算结果表明，由于\（\ nabla T \）与\（\ nabla \ hat {\ mathbf {n} } \），在HAN微流体通道中，涡流\（\ mathbf {v} \）可能会被激发。\（\ mathbf {v} \）的方向和大小受\（\ mathbf {q} \）和E ₀以及HAN微流体通道的厚度影响。

图形概要