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Heat Transfer Research
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ISSN Print: 1064-2285
ISSN Online: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2016010905
pages 893-906

CHARACTERISTICS OF HEAT TRANSFER AROUND AN OBSTACLE CONTROLLED BY THE PRESENCE OF RIBS

Zahra Ghorbani-Tari
Division of Heat Transfer, Department of Energy Sciences, Lund University, P.O. Box 118, SE-22100, Lund, Sweden
Lei Wang
Division of Heat Transfer, Department of Energy Sciences, Lund University, Box 118, Lund, SE-2 2 100, Sweden
Bengt Sunden
Department of Energy Sciences, Lund University, P.O. Box 118, SE-22100, Lund, Sweden

ABSTRACT

Using liquid crystal thermography, experimental studies were carried out to investigate the local heat transfer of an obstacle integrated with a rib. The rib was positioned in the upstream region of the obstacle to disturb the boundary layer of the approaching flow by precipitating the flow separation and reattachment. The spacing between the rib and the obstacle is of primary importance. The spacing S, which is normalized by the spanwise width of the obstacle, is equal to 1.25d and 0.625d. The effect of the rib height-to-hydraulic diameter ratio e/Dh is also of concern in this study. The e/Dh is between 0.039 or 0.078. The Reynolds number based on the spanwise width of the obstacle ranges between 35,600 and 55,600. It was found that the local heat transfer especially in the upstream region was strongly affected by e/Dh and S/d. In the downstream region, the local heat transfer was more affected by the Reynolds number than the rib height and the spacing.