  This article investigates how the acoustic propulsion of cone-shaped
colloidal particles that are exposed to a traveling ultrasound wave depends on
the viscosity of the fluid surrounding the particles. Using acoustofluidic
computer simulations, we found that the propulsion of such nano- and microcones
decreases strongly and even changes sign for increasing shear viscosity. In
contrast, we found only a weak dependence of the propulsion on the bulk
viscosity. The obtained results are in line with the findings of previous
theoretical and experimental studies.
