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research-article

Influence of Rotating Directions on Hydro-Thermal Characteristics of a Two-Pass Parallelogram Channel With Detached Transverse Ribs

[+] Author and Article Information
Tong-Miin Liou

Professor, Department of Power Mechanical Engineering, National Tsing Hua University, No. 101, Section 2, Kuang-Fu Road, Hsinchu, Taiwan 30013, R.O.C.
tmliou@pme.nthu.edu.tw

Professor Shyy Woei Chang

Professor, Department of System and Naval Mechatronic Engineering, National Cheng Kung University, No. 1, University Road, Tainan City 701, Taiwan R.O.C.
swchang@mail.ncku.edu.tw

C.Y. Huang

Professor, Department of Power Mechanical Engineering, National Tsing Hua University, No. 101, Section 2, Kuang-Fu Road, Hsinchu, Taiwan 30013, R.O.C.
cyhuang@pme.nthu.edu.tw

I An Lan

Ph.D. Candidate, Department of Power Mechanical Engineering, National Tsing Hua University, No. 101, Section 2, Kuang-Fu Road, Hsinchu, Taiwan 30013, R.O.C.
gandalflan@gmail.com

Shu-Po Chan

Ph.D. Candidate, Department of Power Mechanical Engineering, National Tsing Hua University, No. 101, Section 2, Kuang-Fu Road, Hsinchu, Taiwan 30013, R.O.C.
tedchan0611@gmail.com

1Corresponding author.

ASME doi:10.1115/1.4040150 History: Received December 28, 2017; Revised April 24, 2018

Abstract

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 5,000<Re<15,000, 0<Ro<0.3, 0.044<??/?<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 LE and 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 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 900 ribs, the detached ribs generate the higher degrees of heat transfer enhancements with the larger extents of f augmentations.

Copyright (c) 2018 by ASME
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