An integrated multiphase flow sensor for microchannels
The flow regimes of microscale multiphase flows affect the yield and selectivity of microchemical systems, and the heat transfer properties of micro heat exchangers. We describe an integrated optical sensor that uses total internal reflection to detect the structure of multiphase flows in microchann...
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| Veröffentlicht in: | Experiments in fluids 2004-06, Vol.36 (6), p.819-832 |
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| container_title | Experiments in fluids |
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| creator | KRAUS, Tobias GÜNTHER, Axel DE MAS, Nuria SCHMIDT, Martin A JENSEN, Klavs F |
| description | The flow regimes of microscale multiphase flows affect the yield and selectivity of microchemical systems, and the heat transfer properties of micro heat exchangers. We describe an integrated optical sensor that uses total internal reflection to detect the structure of multiphase flows in microchannels. The non-intrusive sensor enables detection of individual slugs, bubbles, or drops, and can be used to continuously determine their number and velocity. The sensor performance is modeled using ray-tracing techniques, and tested for several channel geometries. Both gas-liquid and liquid-liquid flows are investigated in microchannels with rectangular and triangular cross-sections. Statistical properties of the flow, derived from the sensor signal, compare favorably to commonly-used dynamic pressure measurements. We demonstrate the integration of the sensor into a planar multichannel microreactor. An existing glass layer used as a waveguide allows us to monitor flows in optically inaccessible channels. This sensor configuration can be integrated into layers of vertically-stacked multichannel microreactors. |
| doi_str_mv | 10.1007/s00348-003-0764-0 |
| format | Article |
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| language | eng |
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| source | Springer Online Journals Complete |
| subjects | Applied fluid mechanics Applied sciences Channels Chemical engineering Exact sciences and technology Fluid dynamics Fluidics Fundamental areas of phenomenology (including applications) Instrumentation for fluid dynamics Mathematical models Microchannels Microreactors Monitors Multichannel Multiphase flow Physics Reactors Sensors |
| title | An integrated multiphase flow sensor for microchannels |
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