Nonmechanical principle for producing a flow in a homogeneously aligned microfluidic nematic channel
Poznan University of Economics and Business, Al. Niepodleglosci 10, 61-875, Poznan, Poland
2 Saint Petersburg Institute for Machine Sciences, The Russian Academy of Sciences, 199178, Saint Petersburg, Russia
Accepted: 28 April 2020
Published online: 27 May 2020
Nonmechanical fluid pumping principle has been developed utilizing the interactions of both the director 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 and the surface electric field E0, originating from the surface charge density . The heat flux 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 and , in the HAN microfluidic channel the vortical flow may be excited. The direction and magnitude of is influenced by and E0, as well as by the thickness of the HAN microfluidic channel.
Key words: Soft Matter: Liquid crystals
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature, 2020