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Special Issue, Vol. 3, December 2008, pp.47-58

 

 

Bullet

 

Ultrasound-driven Viscous Streaming, Modelled via Momentum Injection

 

1James PACKER, 2 Daniel ATTINGER and 1Yiannis VENTIKOS

1Fluidics and Biocomplexity Group, Department for Engineering Science,

University of Oxford, Oxford, OX1 3PJ, UK

Tel.: +44(0)1865-283452

2Laboratory for Microscale Transport Phenomena,
Department of Mechanical Engineering, Columbia University, tel.: +1 212 854 28 41

E-mail: Yiannis.Ventikos@eng.ox.ac.uk, da2203@columbia.edu

 

 

Received: 31 October 2008   /Accepted: 7 November 2008   /Published: 8 December 2008

 

Abstract: Microfluidic devices can use steady streaming caused by the ultrasonic oscillation of one or many gas bubbles in a liquid to drive small scale flow. Such streaming flows are difficult to evaluate, as analytic solutions are not available for any but the simplest cases, and direct computational fluid dynamics models are unsatisfactory due to the large difference in flow velocity between the steady streaming and the leading order oscillatory motion. We develop a numerical technique which uses a two-stage multiscale computational fluid dynamics approach to find the streaming flow as a steady problem, and validate this model against experimental results.

 

Keywords: Acoustic streaming, CFD, Lab-on-a-chip, Microfluidic devices, Multiscale

 

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