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Direction control of quasi-stokeslet induced by thermoplasmonic heating of a water vapor microbubble

Direction control of quasi-stokeslet induced by thermoplasmonic heating of a water vapor microbubble
Direction control of quasi-stokeslet induced by thermoplasmonic heating of a water vapor microbubble

We investigate the control of flow direction around a water vapor bubble using the thermoplasmonic effect of a gold nanoisland film (GNF) under laser irradiation with multiple spots. By focusing a laser spot on the GNF immersed in degassed water, a water vapor bubble with a diameter of ~10 μm is generated. Simultaneously, a sub laser spot was focused next to the bubble to yield a temperature gradient in the direction parallel to the GNF surface. Consequently, rapid flow was generated around the bubble, whose flow direction was dependent on the power of the sub laser spot. The observed flow was well-described using a stokeslet; the latter contained components normal and parallel to the GNF surface and was set to 10 μm above the GNF. This technique allows us to apply a significant force on the microfluid at the vicinity of the wall in the direction parallel to the wall surface, where the flow speed is generally suppressed by viscosity. It is expected to be useful for microfluidic pumping and microfluidic thermal management.

2045-2322
1-9
Namura, Kyoko
af4046f1-736f-407e-9e67-c31f00257880
Imafuku, Souki
b0ffba37-26ba-4c95-bc97-12eab781ed7b
Kumar, Samir
2a7c9f36-6901-4749-bac3-61ccffaeb034
Nakajima, Kaoru
ffc725cc-03b4-4ab0-829a-4a8dff26e01d
Sakakura, Masaaki
3bb15bbd-d590-4cba-ab5a-862dc7acd054
Suzuki, Motofumi
1fdf9946-ae8d-4271-8799-e8d5cb4d3b1a
Namura, Kyoko
af4046f1-736f-407e-9e67-c31f00257880
Imafuku, Souki
b0ffba37-26ba-4c95-bc97-12eab781ed7b
Kumar, Samir
2a7c9f36-6901-4749-bac3-61ccffaeb034
Nakajima, Kaoru
ffc725cc-03b4-4ab0-829a-4a8dff26e01d
Sakakura, Masaaki
3bb15bbd-d590-4cba-ab5a-862dc7acd054
Suzuki, Motofumi
1fdf9946-ae8d-4271-8799-e8d5cb4d3b1a

Namura, Kyoko, Imafuku, Souki, Kumar, Samir, Nakajima, Kaoru, Sakakura, Masaaki and Suzuki, Motofumi (2019) Direction control of quasi-stokeslet induced by thermoplasmonic heating of a water vapor microbubble. Scientific Reports, 9 (1), 1-9. (doi:10.1038/s41598-019-41255-5).

Record type: Article

Abstract

We investigate the control of flow direction around a water vapor bubble using the thermoplasmonic effect of a gold nanoisland film (GNF) under laser irradiation with multiple spots. By focusing a laser spot on the GNF immersed in degassed water, a water vapor bubble with a diameter of ~10 μm is generated. Simultaneously, a sub laser spot was focused next to the bubble to yield a temperature gradient in the direction parallel to the GNF surface. Consequently, rapid flow was generated around the bubble, whose flow direction was dependent on the power of the sub laser spot. The observed flow was well-described using a stokeslet; the latter contained components normal and parallel to the GNF surface and was set to 10 μm above the GNF. This technique allows us to apply a significant force on the microfluid at the vicinity of the wall in the direction parallel to the wall surface, where the flow speed is generally suppressed by viscosity. It is expected to be useful for microfluidic pumping and microfluidic thermal management.

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M27_s41598-019-41255-5 - Version of Record
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More information

Accepted/In Press date: 4 March 2019
e-pub ahead of print date: 18 March 2019

Identifiers

Local EPrints ID: 429385
URI: https://eprints.soton.ac.uk/id/eprint/429385
ISSN: 2045-2322
PURE UUID: d90a240c-4763-4741-ae56-aeff2280034c

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Date deposited: 27 Mar 2019 17:30
Last modified: 29 Mar 2019 17:30

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Contributors

Author: Kyoko Namura
Author: Souki Imafuku
Author: Samir Kumar
Author: Kaoru Nakajima
Author: Motofumi Suzuki

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