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Geometry of the fluid container plays a key role in the shape of acousticstreaming patterns. Inadvertent vortices can be troublesome in some cases, butif treated properly, the problem turns into a very useful parameter in acoustictweezing or micromixing applications. In this paper, the effects of sinusoidalboundaries of a microchannel on acoustic streaming patterns are studied.Results show that while top and bottom sinusoidal walls are vertically actuatedat the resonance frequency of basic hypothetical rectangular microchannel, somerepetitive acoustic streaming patterns are recognized in classifiable cases.Such patterns can never be produced in rectangular geometry with flatboundaries. Relations between geometrical parameters and emerging acousticstreaming patterns lead us to propose formulas in order to predict more cases.Such results and formulations were not trivial at a glance.

Repetitive acoustic streaming patterns in sinusoidal shaped microchannels