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Research Papers: Forced Convection

Heat Transfer Enhancement and Turbulent Flow in a Rectangular Channel Using Perforated Ribs With Inclined Holes

[+] Author and Article Information
Jian Liu, Safeer Hussain, Lei Wang

Division of Heat Transfer,
Department of Energy Sciences,
Lund University,
P.O. Box 118,
Lund SE-22100, Sweden

Wei Wang

School of Energy Science and Engineering,
Harbin Institute of Technology,
Harbin 150001, China

Gongnan Xie

School of Marine Science and Technology,
Northwestern Polytechnical University,
Xi'an, Shaanxi 710072, China

Bengt Sundén

Division of Heat Transfer,
Department of Energy Sciences,
Lund University,
P.O. Box 118,
Lund SE-22100, Sweden
e-mail: bengt.sunden@energy.lth.se

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received September 16, 2018; final manuscript received February 8, 2019; published online February 27, 2019. Assoc. Editor: Guihua Tang.

J. Heat Transfer 141(4), 041702 (Feb 27, 2019) (15 pages) Paper No: HT-18-1611; doi: 10.1115/1.4042841 History: Received September 16, 2018; Revised February 08, 2019

In internal cooling passages in a turbine blade, rib structures are widely applied to augment convective heat transfer by the coolant passing through over the ribbed surfaces. This study concentrates on perforated 90 deg ribs with inclined holes in a cooling duct with rectangular cross section, aiming at improving the perforated holes with additional secondary flows caused by inclined hole arrangements. Two sets of perforated ribs are used in the experiments with the inclined angle of the holes changing from 0 deg to 45 deg and the cross section are, respectively, circular and square. Steady-state liquid crystal thermography (LCT) is applied to measure the ribbed surface temperature and obtain corresponding convective heat transfer coefficients (HTCs). Two turbulence models, i.e., the kω shear stress transportation (SST) model and the detached eddy simulation (DES) model, are used in the numerical studies to simulate the flow fields. All the inclined cases have slightly larger overall averaged Nusselt number (Nu) than with straight cases. The enhancement ratio is approximately 1.85–4.94%. The averaged Nu in the half portion against the inclined direction is enlarged for the inclined hole cases. The inclined hole cases usually have smaller averaged Nu in the half portion along the inclined direction. For the straight hole case and small inclined angle case, the penetrated flows mix with the mainstream flows at the perforated regions. When the inclined angle is larger, the penetrated flows are pushed to the inclined direction and mixing with the approaching flows occurs just at the side of the inclined direction.

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Figures

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Fig. 1

Conceptual 3D flow pattern inside rib-roughened walls induced by inclined angle [33]

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Fig. 2

Schematics of experimental setup and liquid crystal package in the experiments

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Fig. 3

Test section and tested perforated rib configurations

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Fig. 4

The computational channel and structured meshes near the perforated region

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Fig. 5

Averaged Nusselt number on the selected regions of the heated surfaces for all the perforated cases at Re = 80,000 by LCT experiments

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Fig. 6

Comparisons of the averaged Nusselt number on the selected regions of the heated surfaces for all the perforated cases at Re = 80,000 by LCT experiments

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Fig. 7

Nusselt number contours on the heated surfaces for the perforated ribs with circular and square holes with different inclined angles at Re = 80,000 by LCT experiments

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Fig. 8

Nusselt number contours on the heated surfaces for the perforated ribs with circular holes with inclined angle α = 15 deg at different Reynolds numbers by LCT experiments

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Fig. 9

Streamwise and spanwise Nusselt number distributions on the heated surfaces for the perforated ribs with circular holes with different inclined angles (cases 1a–1d) at Re = 80,000 by LCT experiments: (a) streamwise distribution; (b) spanwise distribution

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Fig. 10

Streamwise and spanwise Nusselt number distributions on the heated surfaces for case 1c at different Reynolds numbers by LCT experiments

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Fig. 11

Comparisons of the experimental and calculated results of the streamwise Nusselt number distributions for case 0 and case 2a at Re = 80,000

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Fig. 12

Comparisons of the experimental and calculated Nusselt number contours for case 2b and case 2d at Re = 80,000

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Fig. 13

Comparisons of the experimental and calculated Nusselt number distributions along the streamwise and spanwise direction for case 2b and case 2d at Re = 80,000

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Fig. 14

Vortex structures around the perforated rib region by Q-criterion for all the cases at Re = 80,000

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Fig. 15

Three dimensional streamlines around the perforated rib region for all the cases at Re = 80,000

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Fig. 16

Streamlines and TKE distributions on the xz section for all the cases. The section is selected at the centerline of the channel.

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Fig. 17

Streamlines and TKE distributions on the yz section for cases 1a–1d. The section is located at the x/P= 0.3.

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