[en] Using experiments and numerical simulations, we demonstrate that the curvature of microscale conduits allow programming of liquid crystal (LC) flows. Focusing on a nematic LC flowing through U- and L-shaped channels of rectangular cross-section, our results reveal that curved flow paths can trigger gradients of flow-induced director field in the transverse direction. The emergent director field feeds back into the flow field, ultimately leading to LC flows controlled by the channel curvature. This curvature-mediated flow control, identified by polarizing optical microscopy and supported by the nematofluidic solutions, offers novel concepts in LC-based microfluidic valves and throttles, wherein the throughput distribution is determined by the Ericksen number and the variations in the local curvature. Finally, this work highlights the role of deformation history on flow-induced director alignments, when the viscous and elastic effects comparable in strength.
Disciplines :
Physique
Auteur, co-auteur :
Fedorowicz, Kamil
Prosser
SENGUPTA, Anupam ; University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)
Co-auteurs externes :
yes
Langue du document :
Anglais
Titre :
Curvature-mediated Programming of Liquid Crystal Microflows
Date de publication/diffusion :
29 août 2023
Titre du périodique :
Soft Matter
ISSN :
1744-683X
eISSN :
1744-6848
Maison d'édition :
Royal Society of Chemistry, Cambridge, Royaume-Uni
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