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Research Papers: Heat and Mass Transfer

# Heat Transfer and Flow Characteristics of Two-Pass Parallelogram Channels With Attached and Detached Transverse Ribs

[+] Author and Article Information
T. M. Liou

Professor
Department of Power Mechanical Engineering,
National Tsing-Hua University,
Hsinchu 30013, Taiwan
e-mail: tmliou@pme.nthu.edu.tw

S. W. Chang

Professor
Thermal Fluids laboratory,
National Kaohsiung Marine University,
Kaohsiung 80543, Taiwan
e-mail: swchang@mail.nkmu.edu.tw

Y. A. Lan

Department of Power Mechanical Engineering,
National Tsing-Hua University,
Hsinchu 30013, Taiwan
e-mail: gandalflan@gmail.com

S. P. Chan

Department of Power Mechanical Engineering,
National Tsing-Hua University,
Hsinchu 30013, Taiwan
e-mail: tedchan0611@gmail.com

Y. S. Liu

Department of Mechanical Engineering,
Imperial College,
London SW7 2AZ, UK
e-mail: lyushuai@gmail.com

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received March 7, 2016; final manuscript received November 13, 2016; published online January 10, 2017. Assoc. Editor: P. K. Das.

J. Heat Transfer 139(4), 042001 (Jan 10, 2017) (11 pages) Paper No: HT-16-1119; doi: 10.1115/1.4035279 History: Received March 07, 2016; Revised November 13, 2016

## Abstract

The full-field Nusselt number (Nu) distributions and flow fields are presented, respectively, using steady-state infrared thermography (IR) and particle image velocimetry (PIV) in the two-pass parallelogram channels with attached and detached transverse ribs. These square transverse ribs on two opposite channel walls are in-line arranged with rib-height to duct-height ratio of 0.1 and rib pitch-to-height ratio of 10. For the detached ribs, the detached distance between rib and channel wall is 0.38 rib height. With the measurements of Fanning friction factor (f), the thermal performance factors (TPF) for the attached and detached-rib cases are comparatively examined. A set of Nu, f, and TPF with the associated flow measurements at the Reynolds number range of 5000 ≤ Re ≤ 20,000 is selected to disclose the differential heat transfer mechanisms and efficiencies between the attached and detached ribbed channels. Empirical correlations evaluating the area-averaged Nusselt numbers ($Nu¯$) and f factors are devised to assist the relevant design activities.

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## References

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## Figures

Fig. 1

Sketches of (a) flow measurement and (b) heat transfer measurement facilities

Fig. 2

Measured streamwise mean-velocity and turbulence intensity profiles along Z* = −0.5 at inlet reference station (X* = 7.81) for the present attached- and detached-rib cases as well as the previous smooth case [23]

Fig. 3

Variation of (a) mean flow pattern, turbulence intensity, and turbulence kinetic energy along Z* = −0.5 plane as well as (b) secondary flow patterns (facing downstream) at some selected rib locations along inlet leg for attached- and detached-rib cases at Re = 10,000

Fig. 4

(a) Secondary flow structures (facing downstream) through sharp bend for attached- and detached-rib cases with (b) the selected Nu profiles on front and back endwalls for detached-rib case

Fig. 5

The variation of (a) mean flow pattern, turbulence intensity, turbulence kinetic energy and (b) secondary flow pattern at some selected rib locations along outlet leg for attached- and detached-rib cases at Re = 10,000

Fig. 6

Full-field local Nu distribution over front/back endwalls of test channels for (a) attached- and (b) detached-rib cases at Re = 10,000

Fig. 7

(a) Streamwise Nu profiles along channel centerline and (b) selected spanwise Nu profiles at rib/midrib locations for attached- and detached-rib cases at Re = 10,000

Fig. 8

Variations of Nu¯IL,TR,OL,A  and Nu¯IL,TR,OL,A/Nu with Re for attached- and detached-rib cases

Fig. 9

Variations of (a) f and (b) f/f with Re for the attached and detached rib cases

Fig. 10

Comparison of TPF variations with Res between present study and previous results in two-pass rectangular [4,5] and parallelogram [8] channels mounted with 45-deg ribs

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