Effect of rib angle orientation on flow field in a two-pass parallelogram channel with 180-deg sharp turn

Tong Miin Liou, Shyy Woei Chang, Shu Po Chan, Yu Shuai Liu

研究成果: Conference contribution

2 引文 (Scopus)

摘要

Detailed flow patterns and turbulence parameters, including secondary-flow mean velocity vector, turbulent intensity, Reynolds stress and turbulent kinetic energy, are compared between three different rib orientations (45-deg,-45-deg, and 90-deg) in a two-pass ribbed-wall parallelogram channel with a 180-deg sharp turn. Velocity measurements were performed with Particle Image Velocimetry (PIV). The channel has a cross-sectional equal length, 45.5 mm, of adjacent sides and two pairs of opposite angles are 45-deg and 135-deg. The rib height-to-hydraulic diameter ratio and pitch-to-height ratio were 0.1 and 10, respectively. All the measurements were performed at a fixed Reynolds number, characterized by channel hydraulic diameter of 32.17 mm, cross-sectional bulk mean velocity, and fluid property of air at room temperature, of 10,000 and a null rotating number. A correlation between pitchwise variations of the reattachment lengths and rib-edge normal mean velocities is found. In addition, a comparison of the spanwise reattachment loci in the present parallelogram channel with those reported previously in the square channels is made. Overall, the 45-deg ribs and-45-deg or 90-deg ribs augment the secondary flow motion most in the first and second pass, respectively. Among the rib orientations investigated, the 45-deg and-45-deg ribs induce a pair of counter-rotating longitudinal vortices that strengthens the inlet-generated secondary flow in the first pass and the 180-deg sharp turn generated secondary flow in the second pass, respectively. One interesting finding is the noticeable difference in the flow characteristics near the top and bottom walls of the parallelogram channel for all three rib angles examined. On the contrary, previous studies with the square channels revealed almost the same heat transfer distributions on the 45-deg ribbed top and bottom walls.

原文English
主出版物標題Heat Transfer
發行者American Society of Mechanical Engineers (ASME)
ISBN(電子)9780791856710, 9780791856710
DOIs
出版狀態Published - 2015 一月 1
事件ASME Turbo Expo 2015: Turbine Technical Conference and Exposition, GT 2015 - Montreal, Canada
持續時間: 2015 六月 152015 六月 19

出版系列

名字Proceedings of the ASME Turbo Expo
5A

Other

OtherASME Turbo Expo 2015: Turbine Technical Conference and Exposition, GT 2015
國家Canada
城市Montreal
期間15-06-1515-06-19

指紋

Secondary flow
Flow fields
Velocity measurement
Hydraulics
Intake systems
Kinetic energy
Flow patterns
Vortex flow
Reynolds number
Turbulence
Heat transfer
Fluids
Air
Temperature

All Science Journal Classification (ASJC) codes

  • Engineering(all)

引用此文

Liou, T. M., Chang, S. W., Chan, S. P., & Liu, Y. S. (2015). Effect of rib angle orientation on flow field in a two-pass parallelogram channel with 180-deg sharp turn. 於 Heat Transfer (Proceedings of the ASME Turbo Expo; 卷 5A). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/GT2015-42684
Liou, Tong Miin ; Chang, Shyy Woei ; Chan, Shu Po ; Liu, Yu Shuai. / Effect of rib angle orientation on flow field in a two-pass parallelogram channel with 180-deg sharp turn. Heat Transfer. American Society of Mechanical Engineers (ASME), 2015. (Proceedings of the ASME Turbo Expo).
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Liou, TM, Chang, SW, Chan, SP & Liu, YS 2015, Effect of rib angle orientation on flow field in a two-pass parallelogram channel with 180-deg sharp turn. 於 Heat Transfer. Proceedings of the ASME Turbo Expo, 卷 5A, American Society of Mechanical Engineers (ASME), ASME Turbo Expo 2015: Turbine Technical Conference and Exposition, GT 2015, Montreal, Canada, 15-06-15. https://doi.org/10.1115/GT2015-42684

Effect of rib angle orientation on flow field in a two-pass parallelogram channel with 180-deg sharp turn. / Liou, Tong Miin; Chang, Shyy Woei; Chan, Shu Po; Liu, Yu Shuai.

Heat Transfer. American Society of Mechanical Engineers (ASME), 2015. (Proceedings of the ASME Turbo Expo; 卷 5A).

研究成果: Conference contribution

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N2 - Detailed flow patterns and turbulence parameters, including secondary-flow mean velocity vector, turbulent intensity, Reynolds stress and turbulent kinetic energy, are compared between three different rib orientations (45-deg,-45-deg, and 90-deg) in a two-pass ribbed-wall parallelogram channel with a 180-deg sharp turn. Velocity measurements were performed with Particle Image Velocimetry (PIV). The channel has a cross-sectional equal length, 45.5 mm, of adjacent sides and two pairs of opposite angles are 45-deg and 135-deg. The rib height-to-hydraulic diameter ratio and pitch-to-height ratio were 0.1 and 10, respectively. All the measurements were performed at a fixed Reynolds number, characterized by channel hydraulic diameter of 32.17 mm, cross-sectional bulk mean velocity, and fluid property of air at room temperature, of 10,000 and a null rotating number. A correlation between pitchwise variations of the reattachment lengths and rib-edge normal mean velocities is found. In addition, a comparison of the spanwise reattachment loci in the present parallelogram channel with those reported previously in the square channels is made. Overall, the 45-deg ribs and-45-deg or 90-deg ribs augment the secondary flow motion most in the first and second pass, respectively. Among the rib orientations investigated, the 45-deg and-45-deg ribs induce a pair of counter-rotating longitudinal vortices that strengthens the inlet-generated secondary flow in the first pass and the 180-deg sharp turn generated secondary flow in the second pass, respectively. One interesting finding is the noticeable difference in the flow characteristics near the top and bottom walls of the parallelogram channel for all three rib angles examined. On the contrary, previous studies with the square channels revealed almost the same heat transfer distributions on the 45-deg ribbed top and bottom walls.

AB - Detailed flow patterns and turbulence parameters, including secondary-flow mean velocity vector, turbulent intensity, Reynolds stress and turbulent kinetic energy, are compared between three different rib orientations (45-deg,-45-deg, and 90-deg) in a two-pass ribbed-wall parallelogram channel with a 180-deg sharp turn. Velocity measurements were performed with Particle Image Velocimetry (PIV). The channel has a cross-sectional equal length, 45.5 mm, of adjacent sides and two pairs of opposite angles are 45-deg and 135-deg. The rib height-to-hydraulic diameter ratio and pitch-to-height ratio were 0.1 and 10, respectively. All the measurements were performed at a fixed Reynolds number, characterized by channel hydraulic diameter of 32.17 mm, cross-sectional bulk mean velocity, and fluid property of air at room temperature, of 10,000 and a null rotating number. A correlation between pitchwise variations of the reattachment lengths and rib-edge normal mean velocities is found. In addition, a comparison of the spanwise reattachment loci in the present parallelogram channel with those reported previously in the square channels is made. Overall, the 45-deg ribs and-45-deg or 90-deg ribs augment the secondary flow motion most in the first and second pass, respectively. Among the rib orientations investigated, the 45-deg and-45-deg ribs induce a pair of counter-rotating longitudinal vortices that strengthens the inlet-generated secondary flow in the first pass and the 180-deg sharp turn generated secondary flow in the second pass, respectively. One interesting finding is the noticeable difference in the flow characteristics near the top and bottom walls of the parallelogram channel for all three rib angles examined. On the contrary, previous studies with the square channels revealed almost the same heat transfer distributions on the 45-deg ribbed top and bottom walls.

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Liou TM, Chang SW, Chan SP, Liu YS. Effect of rib angle orientation on flow field in a two-pass parallelogram channel with 180-deg sharp turn. 於 Heat Transfer. American Society of Mechanical Engineers (ASME). 2015. (Proceedings of the ASME Turbo Expo). https://doi.org/10.1115/GT2015-42684