Detailed Nusselt number (Nu) distributions over the leading (LE) and trailing (TE) endwalls and the pressure drop coefficients (f) of a rotating transverse-ribbed two-pass parallelogram channel were measured. The impacts of Reynolds (Re), rotation (Ro), and buoyancy (Bu) numbers upon local and regionally averaged Nu over the endwall of two ribbed legs and the turn are explored for Re = 5000–20,000, Ro = 0–0.3, and Bu = 0.0015–0.122. The present work aims to study the combined buoyancy and Coriolis effects on thermal performances as the first attempt. A set of selected experimental data illustrates the isolated and interdependent Ro and Bu influences upon Nu with the impacts of Re and Ro on f disclosed. Moreover, thermal performance factors (TPF) for the tested channel are evaluated and compared with those collected from the channels with different cross-sectional shapes and endwall configurations to enlighten the relative heat transfer efficiency under rotating condition. Empirical Nu and f correlations are acquired to govern the entire Nu and f data generated. These correlations allow one to evaluate both isolated and combined Re, Ro and/or Bu impacts upon the thermal performances of the present rotating channel for internal cooling of gas turbine blades.
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Isolated and Coupled Effects of Rotating and Buoyancy Number on Heat Transfer and Pressure Drop in a Rotating Two-Pass Parallelogram Channel With 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, Republic of China
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, Republic of China
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,
No. 1, University Road,
Tainan City 701, Taiwan, Republic of China
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, Republic of China
e-mail: swchang@mail.ncku.edu.tw
Search for other works by this author on:
Yi-An Lan,
Yi-An Lan
Department of Power Mechanical Engineering,
National Tsing Hua University,
No. 101, Section 2, Kuang-Fu Road,
Hsinchu 30013, Taiwan, Republic of China
e-mail: gandalflan@gmail.com
National Tsing Hua University,
No. 101, Section 2, Kuang-Fu Road,
Hsinchu 30013, Taiwan, Republic of China
e-mail: gandalflan@gmail.com
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Shu-Po Chan
Shu-Po Chan
Department of Power Mechanical Engineering,
National Tsing Hua University,
No. 101, Section 2, Kuang-Fu Road,
Hsinchu 30013, Taiwan, Republic of China
e-mail: tedchan0611@gmail.com
National Tsing Hua University,
No. 101, Section 2, Kuang-Fu Road,
Hsinchu 30013, Taiwan, Republic of China
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, Republic of China
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, Republic of China
e-mail: tmliou@pme.nthu.edu.tw
Shyy Woei Chang
Professor
Department of System and Naval Mechatronic
Engineering,
National Cheng Kung University,
No. 1, University Road,
Tainan City 701, Taiwan, Republic of China
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, Republic of China
e-mail: swchang@mail.ncku.edu.tw
Yi-An Lan
Department of Power Mechanical Engineering,
National Tsing Hua University,
No. 101, Section 2, Kuang-Fu Road,
Hsinchu 30013, Taiwan, Republic of China
e-mail: gandalflan@gmail.com
National Tsing Hua University,
No. 101, Section 2, Kuang-Fu Road,
Hsinchu 30013, Taiwan, Republic of China
e-mail: gandalflan@gmail.com
Shu-Po Chan
Department of Power Mechanical Engineering,
National Tsing Hua University,
No. 101, Section 2, Kuang-Fu Road,
Hsinchu 30013, Taiwan, Republic of China
e-mail: tedchan0611@gmail.com
National Tsing Hua University,
No. 101, Section 2, Kuang-Fu Road,
Hsinchu 30013, Taiwan, Republic of China
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 March 26, 2017; final manuscript received August 10, 2017; published online November 7, 2017. Assoc. Editor: Milind A. Jog.
J. Heat Transfer. Mar 2018, 140(3): 032001 (14 pages)
Published Online: November 7, 2017
Article history
Received:
March 26, 2017
Revised:
August 10, 2017
Citation
Liou, T., Chang, S. W., Lan, Y., and Chan, S. (November 7, 2017). "Isolated and Coupled Effects of Rotating and Buoyancy Number on Heat Transfer and Pressure Drop in a Rotating Two-Pass Parallelogram Channel With Transverse Ribs." ASME. J. Heat Transfer. March 2018; 140(3): 032001. https://doi.org/10.1115/1.4038133
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