Hydrodynamic drag reduction of shear-thinning liquids in superhydrophobic textured microchannels

Abstract Super-hydrophobic textured surfaces reduce hydrodynamic drag in pressure-driven laminar flows micro-channels. However, despite the wide usage of non-Newtonian liquids microfluidic devices, flow behaviour such was rarely examined so far context friction reduction super-hydrophobic Thus, we have investigated influence topologically different rough on shear-thinning First, factor ratio (a a surface to plain surface) generic textures, as posts, holes, longitudinal and transverse ribs, estimated numerically over range Carreau number function microchannel constriction ratio, gas fraction power-law exponent. Resembling Newtonian liquids, ribs posts exhibited significantly less than holes while ratios all textures has non-monotonic variation with number. While minima were noticed at constant irrespective shifted higher an increase index fraction. Experiments also conducted aqueous Xanthan Gum The enhancement (the rate respect smooth attenuated tantamount simulations. results will serve guide design frictionless micro-channels when employing liquids.