Heat Transfer & Transport Phenomena in Microscale

ISBN Print: 1-56700-150-5

AN EXPERIMENTAL INVESTIGATION OF GASEOUS FLOW CHARACTERISTICS IN MICROCHANNELS

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DOI: 10.1615/1-56700-150-5.200
pages 155-161

Araki Takuto Department of Mechanical Engineering, Kyoto University, Kyoto 606-8501, JAPAN

Kim Min Soo Department of Mechanical Engineering, Kyoto University, Kyoto 606-8501, JAPAN; Kyoto University-Venture Business Laboratory, Kyoto University, Kyoto 606-8501, JAPAN

Iwai Hiroshi Department of Mechanical Engineering, Kyoto University, Kyoto 606-8501, JAPAN

Suzuki Kenjiro Department of Mechanical Engineering, Kyoto University, Kyoto 606-8501, JAPAN

Abstract

The microchannel is one of the essential components for the construction of various micro systems. However, it has been reported that the flow and heat transfer behavior in a microchannel deviates from predictions based on the conventional assumption generally accepted in macro scale channels. Frictional characteristics of nitrogen and helium flows in the three different microchannels (hydraulic diameter ranging 3 to 10µm) have been investigated experimentally. The frictional resistance of gaseous flow in trapezoidal cross-section microchannel was observed to be smaller than that in the conventional sized channel. The reduced frictional resistance in microchannels is caused by the rarefaction effect due to extremely small dimensions of flow passages. By using Maxwell's first order slip boundary condition, we can well predict the mass-flow rate through microchannels and the friction constant.

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