This paper describes the experimental results of Marangoni flow in a microchannel. The microchannel that we examined was made of polydimethylsiloxane (PDMS), shaped by photolithography and molding techniques. The typical channel size was about 100 μm width and 55–70 μm hight. A single-component liquid with ethanol and two-component liquids with mixtures of ethanol and distilled water were used as test liquids. Both liquids contained 1–5 μm diameter tracer particles to visualize the flow-field. Velocity distribution for the single-component liquid shows a fountain-like flow under the reference frame of the gas-liquid interface position. In stark contrast, the distribution for the two-component liquids shows a strong rolling motion near the interface caused by Marangoni flow resulting from a concentration difference. In most cases, this rolling motion is symmetrical to the central axis of the channel. On the interface, the liquid flows from the center to the edge (contact line) position, and the velocity is independent of interfacial velocity and direction. In some cases, we found asymmetric rolling motion. To observe this phenomenon more precisely, we are developing a 3-dimensional (3-D) flow observation system. The flow structures are discussed with the 3-D observation. This phenomenon seems to offer large capability for microfluidic applications such as in a micromixer.
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ASME 3rd International Conference on Microchannels and Minichannels
June 13–15, 2005
Toronto, Ontario, Canada
Conference Sponsors:
- Nanotechnology Institute
ISBN:
0-7918-4185-5
PROCEEDINGS PAPER
Marangoni Flow in a Microchannel
Naoki Ichikawa,
Naoki Ichikawa
National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan
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Peter M.-Y. Chung,
Peter M.-Y. Chung
National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan
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Ryutaro Maeda
Ryutaro Maeda
National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan
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Naoki Ichikawa
National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan
Peter M.-Y. Chung
National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan
Ryutaro Maeda
National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan
Paper No:
ICMM2005-75138, pp. 643-649; 7 pages
Published Online:
November 11, 2008
Citation
Ichikawa, N, Chung, PM, & Maeda, R. "Marangoni Flow in a Microchannel." Proceedings of the ASME 3rd International Conference on Microchannels and Minichannels. ASME 3rd International Conference on Microchannels and Minichannels, Parts A and B. Toronto, Ontario, Canada. June 13–15, 2005. pp. 643-649. ASME. https://doi.org/10.1115/ICMM2005-75138
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