Experimental investigation of gas local resistance across sudden expansion in mini-channels - 文章详情页

作者：

Wang, Ling (Wang, Ling.) | Guo, Hang (Guo, Hang.) (学者：郭航) | Yu, Jian (Yu, Jian.) | Ye, Fang (Ye, Fang.) | Ma, Chong-Fang (Ma, Chong-Fang.)

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摘要：

Local　resistances　of　nitrogen　and　helium　across　sudden　expansion　in　small　channels　with　diameters　from　0.245　mm　to　0.850　mm　were　experimentally　investigated　by　using　a　pressure　measurement　method　of　the　tiny　gaps　on　the　channels.　The　results　showed　that　the　local　resistance　coefficient　was　different　for　two　kinds　of　gases.　In　laminar　flow,　the　expansion　coefficient　for　nitrogen　and　helium　in　microchannels　is　higher　than　that　in　conventional　tubes,　expansion　coefficient　of　helium　is　higher　than　the　nitrogen.　In　turbulent　flow,　the　expansion　resistance　coefficient　increases　while　Reynolds　number　increasing　due　to　gas　compressibility.　In　addition,　the　amplification　of　expansion　coefficient　is　increasing　with　area　ratio　decrease.

关键词：

Helium Reynolds number Laminar flow Compressibility of gases Nitrogen

作者机构：

[ 1 ] [Wang, Ling]Key Laboratory of Enhanced Heat Transfer and Energy Conservation, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
[ 2 ] [Wang, Ling]Key Laboratory of Heat Transfer and Energy Conversion, Beijing University of Technology, Beijing 100124, China
[ 3 ] [Guo, Hang]Key Laboratory of Enhanced Heat Transfer and Energy Conservation, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
[ 4 ] [Guo, Hang]Key Laboratory of Heat Transfer and Energy Conversion, Beijing University of Technology, Beijing 100124, China
[ 5 ] [Yu, Jian]Key Laboratory of Enhanced Heat Transfer and Energy Conservation, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
[ 6 ] [Yu, Jian]Key Laboratory of Heat Transfer and Energy Conversion, Beijing University of Technology, Beijing 100124, China
[ 7 ] [Ye, Fang]Key Laboratory of Enhanced Heat Transfer and Energy Conservation, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
[ 8 ] [Ye, Fang]Key Laboratory of Heat Transfer and Energy Conversion, Beijing University of Technology, Beijing 100124, China
[ 9 ] [Ma, Chong-Fang]Key Laboratory of Enhanced Heat Transfer and Energy Conservation, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
[ 10 ] [Ma, Chong-Fang]Key Laboratory of Heat Transfer and Energy Conversion, Beijing University of Technology, Beijing 100124, China

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