Slip flow in non-circular microchannels |
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Authors: | Zhipeng Duan Y S Muzychka |
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Affiliation: | (1) Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John‘s, NF, A1B 3X5, Canada |
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Abstract: | Microscale fluid dynamics has received intensive interest due to the emergence of Micro-Electro-Mechanical Systems (MEMS)
technology. When the mean free path of the gas is comparable to the channel’s characteristic dimension, the continuum assumption
is no longer valid and a velocity slip may occur at the duct walls. Non-circular cross sections are common channel shapes
that can be produced by microfabrication. The non-circular microchannels have extensive practical applications in MEMS. Slip
flow in non-circular microchannels has been examined and a simple model is proposed to predict the friction factor and Reynolds
product fRe for slip flow in most non-circular microchannels. Through the selection of a characteristic length scale, the square root
of cross-sectional area, the effect of duct shape has been minimized. The developed model has an accuracy of 10% for most
common duct shapes. The developed model may be used to predict mass flow rate and pressure distribution of slip flow in non-circular
microchannels. |
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Keywords: | Slip flow Microchannels Non-circular Pressure distribution |
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