Heat transfer in the third cylinder of four circular cylinders above a plane wall has been investigated in a crossflow of air. The turbulent boundary layer thickness along the wall with no cylinder present was about 21 mm. The cylinder diameter (d) was 15 mm, the clearance (c) between the cylinders and the wall was 0.75 ~ 60 mm (c/ d = 0.05 ~ 4.0), and the pitch (p) (which denotes the longitudinal spacing between cylinder centers) was 18 ~ 66 mm (p/d = 1.2 ~ 4.4). The Reynolds number (Re) based on the undisturbed uniform flow velocity above the wall ranged from 0.8 × 104 ~ 4 × 104. Variations in the characteristic features of local and mean Nusselt number Num are discussed in relation to c/d, p/d, and Re. Num yielded the compact expression Num = 0.103 (p/d)−0.12(c/d)0.23Re0.74, with a spread of ±5 percent in the ranges c/d = 0.18 ~ 0.61, p/d = 1.2 ~ 3.2, and Re = 0.8 × 104 ~ 4 × 104, except for the case with c/d = 0.18, p/d = 3.2.
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Heat Transfer Around a Tube in In-Line Tube Banks Near a Plane Wall
S. Aiba
S. Aiba
Department of Mechanical Engineering, Akita Technical College, Akita 011, Japan
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S. Aiba
Department of Mechanical Engineering, Akita Technical College, Akita 011, Japan
J. Heat Transfer. Nov 1990, 112(4): 933-938 (6 pages)
Published Online: November 1, 1990
Article history
Received:
May 22, 1989
Revised:
February 9, 1990
Online:
May 23, 2008
Citation
Aiba, S. (November 1, 1990). "Heat Transfer Around a Tube in In-Line Tube Banks Near a Plane Wall." ASME. J. Heat Transfer. November 1990; 112(4): 933–938. https://doi.org/10.1115/1.2910503
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