Ultrasound-Driven Fluid Motion - Modelling Approach

D Rubinetti, D A Weiss

Abstract


Fluid motion induced by ultrasound is an effect that arises from the attenuation of sound waves in a fluid. This phenomenon allows for a series of applications in industry. To achieve a significant effect in practice, high-intensity acoustics is required, which can solely be realized using the characteristics of ultrasound. Its high-frequency behaviour on one side is confronted with the nearly steady-state nature of the fluid flow on the other side.

The present study proposes a numerical modelling approach to further investigate and identify development potential. The coupling of acoustics and fluid flow poses a challenging multiphysics problem, its treatment requires an appropriate handling of transient quantities on the different frequency scales. Basically the force triggering a low frequency fluid flow arises based on the time average of quantities varying on a high frequency scale.

The analysis includes an estimation of acting terms by dimensionless relations as well as a verification by means of a simplified test-case. The concept presented is numerically stable and appropiate. It can be adapted to related applications involving sound-driven fluid motion.


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DOI: http://dx.doi.org/10.21152/1750-9548.12.1.1

Copyright (c) 2018 D Rubinetti, D A Weiss

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