Gas-liquid crossing flow in microchannel and its application to gas analysis microchip
We developed a novel microchannel structure comprised of deep/shallow/deep tri-channels. Each end of the channel was split into three, and supplying and taking of fluids to/from the channels was possible. Aqueous solution tended to fill the shallow channel because of the capillary force. Thus, by in...
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Published in | Proceedings of IEEE Sensors, 2004 pp. 166 - 169 vol.1 |
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Main Authors | , , , |
Format | Conference Proceeding |
Language | English |
Published |
Piscataway NJ
IEEE
2004
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Subjects | |
Online Access | Get full text |
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Summary: | We developed a novel microchannel structure comprised of deep/shallow/deep tri-channels. Each end of the channel was split into three, and supplying and taking of fluids to/from the channels was possible. Aqueous solution tended to fill the shallow channel because of the capillary force. Thus, by introducing gas/liquid/gas from one end of the channel, stable laminar three-phase flow was formed throughout the channel. We then introduced liquid/gas/liquid to the channels. The flow became turbulent near the confluence, and settled into a gas/liquid/gas laminar profile downstream. The channel-design and flow rates were optimized to form this gas-liquid crossing flow continuously. The gas-liquid crossing flow was useful in micro-analysis and synthesis, because efficient gas-liquid contact at the turbulence promote extraction and reaction, and spontaneous separation of the two phases enabled post processes (e.g. detection). The crossing flows were also formed in other microchannel-structures like shallow/deep/shallow tri-channels and deep/shallow dual channels. A sensor for low-concentration ammonia gas, by using this structure, was also reported in this paper. |
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ISBN: | 0780386922 9780780386921 |
DOI: | 10.1109/ICSENS.2004.1426126 |