E210 HEAT TRANSFER AND PRESSURE DROP CHARACTERISTICS DURING R22 EVAPORATION IN AN OVAL MICRO-FIN TUBE(Evaporation-2 and others)
スポンサーリンク
概要
- 論文の詳細を見る
An experimental study on R22 evaporating heat transfer in circular and oval micro-fin tubes has been performed. The oval tube was an elliptic tube of axis ratio 1 : 1.5, which was fabricated from the circular tube with an outer diameter of 9.52 mm and 1 8° helix angle counterclockwise. The test section was a straight horizontal tube of 0.6 m in length and was heated electrically by a tape heater wound on the tube surface. Heat flux of 12 kW/m^2 was maintained constant and the range of refrigerant quality was 0.2-0.8. The tests were conducted for evaporation at 15℃ for 30-60 kg/h mass flow rate (mass flux based on the oval tube: 150-300 kg/m^2s) and the installation angles of the oval tube were varied between 0 and 135° in the circumferential direction. The local and average heat transfer and pressure drop characteristics for the oval tube were compared to those for the baseline circular tube. The average heat transfer coefficients for the oval tube were 2-15% higher than that for the round tube and pressure drops for both tubes are similar. The correlations for heat transfer coefficient and friction factor are developed within the rms errors of 4.3% and 1 0.0%, respectively.
- 一般社団法人日本機械学会の論文
- 2000-10-01
著者
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BULLARD Clark
Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign
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Shin Jeong-seob
Department Of Mechanical Engineering Pohang University Of Science And Technology
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Kim Man-hoe
Department Of Mechanical And Industrial Engineering University Of Illinois At Urbana-champaign
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Bullard Clark
Department Of Mechanical And Industrial Engineering University Of Illinois At Urbana-champaign
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Bullard Clark
Department Of Mechanical And Industrial Engineering University Of Illinois At Urbana
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- E210 HEAT TRANSFER AND PRESSURE DROP CHARACTERISTICS DURING R22 EVAPORATION IN AN OVAL MICRO-FIN TUBE(Evaporation-2 and others)
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