The detailed Nusselt number distributions on leading and trailing endwalls together with the Fanning friction factors of a rotating two-pass parallelogram ribbed channel are simultaneously measured under forward and backward rotations. The tested Reynolds number, rotation number, density ratio, and buoyancy number are respectively in the ranges of 5000 < Re < 15,000, 0 < Ro < 0.3, 0.044<Δρ/ρ < 0.2, and 0 < Bu < 0.142. The area-averaged leading and trailing Nusselt numbers at forward rotations are 0.69–1.77 and 0.85–1.98 relative to the static-channel Nusselt number references, respectively. With backward rotations, the ratios of regionally averaged Nusselt numbers between rotating and static channels for leading and trailing endwalls fall in the respective range to 0.86–2 and 0.91–1.76. At both forward and backward rotations, all the f factors over leading endwall (LE) and trailing endwall (TE) are elevated from the static-channel levels and increased by increasing Ro. Channel averaged f/f0 ratios are respectively raised to 1.21–2.21 and 1.21–2.1 at forward and backward rotations. As the heat transfer enhancements (HTE) attributed to the presence of detached transverse ribs taking precedence of the accompanying f augmentations, all the thermal performance factors are above unity in the range of 1.26–2.94. Relative to the similar rotating two-pass parallelogram channel with attached 90 deg ribs, the detached ribs generate the higher degrees of heat transfer enhancements with the larger extents of f augmentations.
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Influence of Rotating Directions on Hydrothermal Characteristics of a Two-Pass Parallelogram Channel With Detached Transverse Ribs
Tong Miin Liou,
Tong Miin Liou
Professor
Department of Power Mechanical Engineering,
National Tsing Hua University,
No. 101, Section 2, Kuang-Fu Road,
Hsinchu 30013, Taiwan
e-mail: tmliou@pme.nthu.edu.tw
Department of Power Mechanical Engineering,
National Tsing Hua University,
No. 101, Section 2, Kuang-Fu Road,
Hsinchu 30013, Taiwan
e-mail: tmliou@pme.nthu.edu.tw
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Shyy Woei Chang,
Shyy Woei Chang
Professor
Department of System and Naval Mechatronic
Engineering,
National Cheng Kung University,
Tainan City 701, Taiwan
e-mail: swchang@mail.ncku.edu.tw
Department of System and Naval Mechatronic
Engineering,
National Cheng Kung University,
No. 1, University Road
,Tainan City 701, Taiwan
e-mail: swchang@mail.ncku.edu.tw
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Chih Yung Huang,
Chih Yung Huang
Professor
Department of Power Mechanical Engineering,
National Tsing Hua University,
Hsinchu 30013, Taiwan
e-mail: cyhuang@pme.nthu.edu.tw
Department of Power Mechanical Engineering,
National Tsing Hua University,
No. 101, Section 2, Kuang-Fu Road
,Hsinchu 30013, Taiwan
e-mail: cyhuang@pme.nthu.edu.tw
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I An Lan,
I An Lan
Department of Power Mechanical Engineering,
National Tsing Hua University,
Hsinchu 30013, Taiwan
e-mail: gandalflan@gmail.com
National Tsing Hua University,
No. 101, Section 2, Kuang-Fu Road
,Hsinchu 30013, Taiwan
e-mail: gandalflan@gmail.com
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Shu Po Chan
Shu Po Chan
Department of Power Mechanical Engineering,
National Tsing Hua University,
Hsinchu 30013, Taiwan
e-mail: tedchan0611@gmail.com
National Tsing Hua University,
No. 101, Section 2, Kuang-Fu Road
,Hsinchu 30013, Taiwan
e-mail: tedchan0611@gmail.com
Search for other works by this author on:
Tong Miin Liou
Professor
Department of Power Mechanical Engineering,
National Tsing Hua University,
No. 101, Section 2, Kuang-Fu Road,
Hsinchu 30013, Taiwan
e-mail: tmliou@pme.nthu.edu.tw
Department of Power Mechanical Engineering,
National Tsing Hua University,
No. 101, Section 2, Kuang-Fu Road,
Hsinchu 30013, Taiwan
e-mail: tmliou@pme.nthu.edu.tw
Shyy Woei Chang
Professor
Department of System and Naval Mechatronic
Engineering,
National Cheng Kung University,
Tainan City 701, Taiwan
e-mail: swchang@mail.ncku.edu.tw
Department of System and Naval Mechatronic
Engineering,
National Cheng Kung University,
No. 1, University Road
,Tainan City 701, Taiwan
e-mail: swchang@mail.ncku.edu.tw
Chih Yung Huang
Professor
Department of Power Mechanical Engineering,
National Tsing Hua University,
Hsinchu 30013, Taiwan
e-mail: cyhuang@pme.nthu.edu.tw
Department of Power Mechanical Engineering,
National Tsing Hua University,
No. 101, Section 2, Kuang-Fu Road
,Hsinchu 30013, Taiwan
e-mail: cyhuang@pme.nthu.edu.tw
I An Lan
Department of Power Mechanical Engineering,
National Tsing Hua University,
Hsinchu 30013, Taiwan
e-mail: gandalflan@gmail.com
National Tsing Hua University,
No. 101, Section 2, Kuang-Fu Road
,Hsinchu 30013, Taiwan
e-mail: gandalflan@gmail.com
Shu Po Chan
Department of Power Mechanical Engineering,
National Tsing Hua University,
Hsinchu 30013, Taiwan
e-mail: tedchan0611@gmail.com
National Tsing Hua University,
No. 101, Section 2, Kuang-Fu Road
,Hsinchu 30013, Taiwan
e-mail: tedchan0611@gmail.com
1Corresponding author.
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received December 28, 2017; final manuscript received April 24, 2018; published online June 8, 2018. Assoc. Editor: Danesh K. Tafti.
J. Heat Transfer. Oct 2018, 140(10): 102004 (17 pages)
Published Online: June 8, 2018
Article history
Received:
December 28, 2017
Revised:
April 24, 2018
Citation
Liou, T. M., Chang, S. W., Huang, C. Y., An Lan, I., and Chan, S. P. (June 8, 2018). "Influence of Rotating Directions on Hydrothermal Characteristics of a Two-Pass Parallelogram Channel With Detached Transverse Ribs." ASME. J. Heat Transfer. October 2018; 140(10): 102004. https://doi.org/10.1115/1.4040150
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