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Research Papers

Heat Transfer Control Around an Obstacle by Using Ribs in the Downstream Region

[+] Author and Article Information
Zahra Ghorbani-Tari, Lei Wang

Division of Heat Transfer,
Department of Energy Sciences,
Lund University,
Box 118,
Lund SE-22 100, Sweden

Bengt Sunden

Professor
Division of Heat Transfer,
Department of Energy Sciences,
Lund University,
Box 118,
Lund SE-22 100, Sweden
e-mail: bengt.sunden@energy.lth.se

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received February 18, 2014; final manuscript received May 12, 2014; published online June 10, 2014. Assoc. Editor: Samuel Sami.

J. Thermal Sci. Eng. Appl 6(4), 041010 (Jun 10, 2014) (7 pages) Paper No: TSEA-14-1034; doi: 10.1115/1.4027721 History: Received February 18, 2014; Revised May 12, 2014

This paper investigates the effect of the presence of a rib on the local heat transfer around an obstacle using liquid crystal technique. An obstacle with a rectangular cross section is placed in a channel and attached to the end-wall. A rib is positioned in the downstream region of the obstacle. The spacing S between the rib and the obstacle is normalized by the spanwise width of the obstacle and the value is 1.25d. The effects of the rib height e/Dh and Reynolds number are investigated. The e/Dh has the values 0.039 and 0.078. The Reynolds number varies between 35,600 and 55,600. It is shown that the local heat transfer in the upstream region of the obstacle remained unaffected by the presence of the rib. The feature of local heat transfer in the downstream area of the obstacle was substantially modified by the presence of the rib.

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Figures

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Fig. 1

Projected flow field around a cube [1]

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Fig. 2

Configuration of the single obstacle in the test section

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Fig. 3

Configuration of the obstacle and the rib in the test section

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Fig. 4

Contours of Nusselt number around a single obstacle Red = 55,600

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Fig. 5

Contours of Nusselt number at Red = 55,600 with rib (a) e/Dh = 0.078 and (b) e/Dh = 0.078

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Fig. 6

Nusselt number profiles along the centerline without rib and with rib e/Dh = 0.078 (a) Red = 55,600 and (b) Red = 35,600

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Fig. 7

Nusselt number profiles along the centerline without rib and with rib for e/Dh = 0.039 (a) Red = 55,600 and (b) Red = 35,600

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Fig. 8

Nusselt number profiles at different spanwise distances with rib (a) e/Dh = 0.078 and (b) e/Dh = 0.039

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Fig. 9

Nusselt number profiles with rib for Red = 55,600. (a) z/d = 0 and (b) z/d = 0.49.

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Fig. 10

Area-averaged Nusselt number versus Reynolds number for the obstacle an all configurations by the rib

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