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Research Papers: Heat Transfer Enhancement

Aerothermal Characteristics of Solid and Slitted Pentagonal Rib Turbulators

[+] Author and Article Information
Andallib Tariq

Mechanical and Industrial
Engineering Department,
Indian Institute of Technology Roorkee,
Roorkee 247667, India
e-mail: tariqfme@iitr.ac.in

Naveen Sharma

Mechanical and Industrial Engineering
Department,
Indian Institute of Technology Roorkee,
Roorkee 247667, India
e-mail: sharma.naveen28@yahoo.com

Manish Mishra

Mechanical and Industrial Engineering
Department,
Indian Institute of Technology Roorkee,
Roorkee 247667, India
e-mail: mmishfme@iitr.ac.in

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received October 10, 2017; final manuscript received February 14, 2018; published online March 21, 2018. Assoc. Editor: Danesh K. Tafti.

J. Heat Transfer 140(6), 061901 (Mar 21, 2018) (14 pages) Paper No: HT-17-1593; doi: 10.1115/1.4039398 History: Received October 10, 2017; Revised February 14, 2018

This work is an experimental study of detailed aerothermal characteristics inside a duct carrying an array of solid and permeable pentagonal ribs with a parallel and inclined slit, mounted on the bottom wall. The rib height-to-hydraulic diameter ratio, the rib pitch-to-height ratio, and the open area ratio fixed during experiments are 0.125%, 12%, and 25%, respectively. The heat transfer coefficient (HTC) distribution is mapped by using transient liquid crystal thermography (LCT), while the detailed flow measurements are performed by using particle image velocimetry (PIV). The primary focus of the study is to assess the influence of inter-rib region flow characteristics on the local heat transfer fields. The heat transfer and friction factor measurements are evaluated along with thermohydraulic performances at different Reynolds numbers, i.e., 26,160, 42,500, and 58,850. Performance indexes show that the pentagonal ribs with the inclined-slit are superior to other configurations from both perspective. Aerothermal features within inter-rib region were elucidated by analyzing the time-averaged streamlines, mean velocities, fluctuation statistics, vorticity, turbulent kinetic energy (TKE) budget terms, and local and spanwise-averaged Nusselt number as well as augmentation Nusselt numbers. Critical flow structures and coherent structures were identified, which illustrate about different flow dynamic processes. The flow emanating out of the inclined-slit pentagonal rib significantly affects the magnitude of streamwise velocity, fluctuation statistics, vorticity, and TKE budget terms at the downstream corner, whereas the dissipation term of TKE budget correlates well with the surface heat transfer distribution.

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Figures

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Fig. 1

Schematic of experimental facility employed for LCT and PIV measurements

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Fig. 2

Rib configurations studied in the present work

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Fig. 3

Comparison of dimensionless velocity profiles over different streamwise locations at Re = 42,500

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Fig. 4

Flow and heat transfer periodicity in the inter-rib region at Re = 42,500, p/e=12

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Fig. 5

(a) Contours and (b) spanwise-averaged augmentation Nusselt number distribution in the inter-rib region between third rib to ninth rib for different pentagonal ribs

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Fig. 6

Time-averaged streamlines superposed on velocity magnitude in an inter-rib region between seventh and eighth rib for different rib configurations in (a) vertical symmetry plane (z/e=0) and (b) horizontal plane at y/e=0.5

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Fig. 7

Flow structures along with ∂w/∂z distribution (normalized by 1000 e/Ur) around different rib configurations

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Fig. 8

Time-averaged normalized (a) u-velocity and (b) v-velocity distribution for different rib configurations

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Fig. 9

Normalized fluctuation statistics distribution for different rib configurations: (a) urms, (b) vrms, and (c) −u′v′

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Fig. 10

Normalized (a) z-vorticity distribution and (b) second invariance of the velocity gradient tensor (Q2D−z) for different rib configurations

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Fig. 11

Distribution of normalized (a) production, (b) dissipations, and (c) diffusion terms of mean TKE in an inter-rib region for different rib configurations

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Fig. 12

Combination of flow field and heat transfer data for (a) solid, (b) parallel-slit, and (c) inclined-slit pentagonal ribs, along with (d) spanwise-averaged Nusselt number variation

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