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Research Papers: Heat Transfer Enhancement

Heat Transfer and Turbulent Flow Structure in Channels With Miniature V-Shaped Rib-Dimple Hybrid Structures on One Wall

[+] Author and Article Information
Peng Zhang

Institute of Turbomachinery,
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: ZhangPeng828@sjtu.edu.cn

Yu Rao

Institute of Turbomachinery,
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: yurao@sjtu.edu.cn

Yanlin Li

Institute of Turbomachinery,
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: Lyl2854@sjtu.edu.cn

Bernhard Weigand

Institute of Aerospace Thermodynamics (ITLR),
University of Stuttgart,
Pfaffenwaldring 31,
Stuttgart 70569, Germany
e-mail: bernhard.weigand@itlr.uni-stuttgart.de

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received January 2, 2019; final manuscript received April 19, 2019; published online May 17, 2019. Assoc. Editor: Srinath V. Ekkad.

J. Heat Transfer 141(7), 071903 (May 17, 2019) (12 pages) Paper No: HT-19-1003; doi: 10.1115/1.4043675 History: Received January 02, 2019; Revised April 19, 2019

An experimental and numerical study has been conducted on heat transfer and turbulent flow structure in channels with novel hybrid structures with miniature V-shaped ribs and dimples on one wall. One miniature V-shaped rib was arranged immediately upstream each individual dimple to form the hybrid structure, which aims at inducing additional near-wall secondary flow interacting with the dimple vortex flow and further improving the heat transfer. Steady-state convective heat transfer experiments were done to obtain the heat transfer and pressure loss of the turbulent flow over the surfaces with the miniature V rib-dimples for the Reynolds numbers from 18,700 to 60,000. In addition, the turbulent flow structure in the V rib-dimpled channels has been predicted by carrying out numerical computations. The experimental results indicated that the overall heat transfer enhancement of the miniature V rib-dimpled channels can be increased by up to about 60.0% compared with the counterpart of the dimpled only channel, and by about 23.0% compared with the counterpart of the miniature V ribbed only channel. The miniature V ribs showed appreciable effects on the heat transfer and pressure loss characteristics for the turbulent flow over the V rib-dimpled surfaces. The numerical computations showed that the miniature V rib upstream each dimple produced strong near-wall downwashing secondary flow, which significantly changed the flow patterns and intensified the turbulent flow mixing inside and outside the dimple and above the surrounding wall. These unique near-wall flow characteristics generated a significant heat transfer improvement in both the magnitude and the uniformity.

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Figures

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Fig. 3

Schematic of the numerical model with boundary conditions

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Fig. 2

Geometrical parameters of the test plate with discrete miniature V-shaped ribs and dimples

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Fig. 1

Schematic of the experimental system

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Fig. 4

Comparisons of Nu¯¯/Nu0 results from different turbulence models

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Fig. 7

(a) Grid independence check for the numerical computations at Re = 50,500 and (b) local GCI distribution on spanwisely averaged Nusselt numbers [23]

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Fig. 5

(a) Comparisons of spanwisely averaged values of Nu¯/Nu0 from different turbulence models and (b) experimental data for local Nu¯/Nu0 on the V-shaped rib-dimpled surface (e = 1.0 mm) at Re = 50,500 [22]

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Fig. 6

Meshing for the channel with miniature V-shaped rib-dimples on one wall

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Fig. 10

Comparisons of (a) Reynolds analogy factor and (b) overall thermal performance

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Fig. 11

Comparisons of Nusselt number ratio contours at Re = 50,500

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Fig. 12

Streamlines and normalized turbulent kinetic energy for a streamwise-normal section at Re = 50,500

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Fig. 8

(a) Comparison of globally averaged Nusselt number ratios between experimental results and numerical results and (b) experimental results of overall Nusselt number ratios and the correlation data

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Fig. 9

Experimental results of friction factor ratios and the correlation data

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Fig. 14

Pathlines and local Nusselt number distribution on (a) V-shaped rib-dimpled surface (e = 1.0 mm), (b) dimpled only surface, and (c) V-shaped ribbed only surface

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Fig. 15

Heat transfer contributions in the channel at Re = 50,500 with (a) V-shaped rib-dimpled surface (e = 1.5 mm), (b) V-shaped rib-dimpled surface (e = 1.0 mm), (c) V-shaped rib-dimpled surface (e = 0.6 mm), (d) dimpled only surface, and (e) V-shaped ribbed only surface

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Fig. 13

Flow structure and normalized turbulent kinetic energy in different spanwise-normal sections at Re = 50,500

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Fig. 16

Nusselt number ratio along the centerline for the V-shaped rib-dimpled surfaces with different V rib heights, the dimpled only surface, and the V-shaped ribbed only surface at Re = 50,500

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