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Effects of micron scale surface profiles on acoustic streaming

Effects of micron scale surface profiles on acoustic streaming
Effects of micron scale surface profiles on acoustic streaming
Conventional models of boundary driven streaming such as Rayleigh-Schlichting streaming typically assume smooth device walls. Using numerical models, we predict that micron scale surface profiles/features have the potential to dramatically modify the inner streaming vortices, creating much higher velocity, smaller scale vortices. Although inner streaming is hard to observe experimentally, this effect is likely to prove important in applications such as DNA tethered microbeads where the flow field near a surface is important. We investigate here the effect of a sinusoidally structured surface in a one-dimensional standing wave field in a rectangular channel using perturbation theory. It was found that inner streaming vortex patterns of scale similar to the profile are formed instead of the much larger eight-vortices-per-wavelength classical inner streaming patterns seen in devices with smooth surfaces, while the outer vortex patterns are similar to that found in a device with smooth surfaces (i.e. Rayleigh streaming). The streaming velocity magnitudes can be orders of magnitude higher than those obtained in a device with smooth surfaces while the outer streaming velocities are similar. The same inner streaming patterns are also found in the presence of propagating waves. The mechanisms behind the effect are seen to be related to the acoustic velocity gradients around surface features.
Acoustic streaming, boundary-driven streaming , structured surface, micro-scale vortex
1613-4982
Lei, Junjun
ab06fbdb-9374-4f9d-8671-8d7d4f9b7f89
Hill, Martyn
0cda65c8-a70f-476f-b126-d2c4460a253e
Ponce De Leon Albarran, Carlos
508a312e-75ff-4bcb-9151-dacc424d755c
Glynne-Jones, Peter
6ca3fcbc-14db-4af9-83e2-cf7c8b91ef0d
Lei, Junjun
ab06fbdb-9374-4f9d-8671-8d7d4f9b7f89
Hill, Martyn
0cda65c8-a70f-476f-b126-d2c4460a253e
Ponce De Leon Albarran, Carlos
508a312e-75ff-4bcb-9151-dacc424d755c
Glynne-Jones, Peter
6ca3fcbc-14db-4af9-83e2-cf7c8b91ef0d

Lei, Junjun, Hill, Martyn, Ponce De Leon Albarran, Carlos and Glynne-Jones, Peter (2018) Effects of micron scale surface profiles on acoustic streaming. Microfluidics and Nanofluidics. (doi:10.1007/s10404-018-2161-2).

Record type: Article

Abstract

Conventional models of boundary driven streaming such as Rayleigh-Schlichting streaming typically assume smooth device walls. Using numerical models, we predict that micron scale surface profiles/features have the potential to dramatically modify the inner streaming vortices, creating much higher velocity, smaller scale vortices. Although inner streaming is hard to observe experimentally, this effect is likely to prove important in applications such as DNA tethered microbeads where the flow field near a surface is important. We investigate here the effect of a sinusoidally structured surface in a one-dimensional standing wave field in a rectangular channel using perturbation theory. It was found that inner streaming vortex patterns of scale similar to the profile are formed instead of the much larger eight-vortices-per-wavelength classical inner streaming patterns seen in devices with smooth surfaces, while the outer vortex patterns are similar to that found in a device with smooth surfaces (i.e. Rayleigh streaming). The streaming velocity magnitudes can be orders of magnitude higher than those obtained in a device with smooth surfaces while the outer streaming velocities are similar. The same inner streaming patterns are also found in the presence of propagating waves. The mechanisms behind the effect are seen to be related to the acoustic velocity gradients around surface features.

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Accepted/In Press date: 8 November 2018
e-pub ahead of print date: 19 November 2018
Keywords: Acoustic streaming, boundary-driven streaming , structured surface, micro-scale vortex

Identifiers

Local EPrints ID: 426141
URI: http://eprints.soton.ac.uk/id/eprint/426141
ISSN: 1613-4982
PURE UUID: 8f94f433-8133-4716-bf91-3ff66cb74516
ORCID for Martyn Hill: ORCID iD orcid.org/0000-0001-6448-9448
ORCID for Carlos Ponce De Leon Albarran: ORCID iD orcid.org/0000-0002-1907-5913
ORCID for Peter Glynne-Jones: ORCID iD orcid.org/0000-0001-5684-3953

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Date deposited: 15 Nov 2018 17:30
Last modified: 17 Dec 2019 05:08

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