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RESEARCH PAPERS: Forced Convection

Heat Transfer Enhancement of a Circular Cylinder

[+] Author and Article Information
Takayuki Tsutsui

Department of Mechanical Engineering, The National Defense Academy, 1-10-20 Hashirimizu, Yokosuka, Kanagawa 239-8686, Japantsutsui@nda.ac.jp

Tamotsu Igarashi

Department of Mechanical Engineering, The National Defense Academy, 1-10-20 Hashirimizu, Yokosuka, Kanagawa 239-8686, Japan

J. Heat Transfer 128(3), 226-233 (Sep 15, 2005) (8 pages) doi:10.1115/1.2150832 History: Received November 17, 2004; Revised September 15, 2005

A rod was positioned upstream of a circular cylinder to enhance its heat transfer in an air stream. The diameter of the cylinder was 40mm and the diameter of the rod ranged from 1to12mm. The distance between the axes of the cylinder and the rod was varied between 40 and 120mm and the Reynolds number ranged from 1.5×104 to 6.2×104. In the optimum configuration, the heat transfer on the front face of the cylinder increases remarkably relative to a single circular cylinder, and results in a 40% overall increase in heat transfer.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Coordinate system and symbols

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Figure 2

Experimental models: (a) constant heat flux model and (b) constant temperature model

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Figure 3

Local and overall Nusselt number of a circular cylinder: (a) local Nusselt number and (b) overall Nusselt number

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Figure 4

Effect of distance x on a circular cylinder: (a) pressure distribution and (b) local Nusselt number

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Figure 5

Flow visualizations around the cylinder (Re=2.1×104): (a) without rod; (b) pattern A (L∕D=1.75, d∕D=0.05); and (c) pattern B (L∕D=1.75, d∕D=0.25)

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Figure 6

Classification of the flow patterns: (a) Re=1.5×104 and (b) Re=6.2×104

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Figure 7

Pressure coefficient distributions around the cylinder (Re=4.1×104): (a) pattern A (L∕D=1.75, d∕D=0.05) and (b) pattern B (L∕D=1.75, d∕D=0.25)

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Figure 8

Surface oil flow patterns (d∕D=0.25, L∕D=1.75, pattern B): (a) Re=1.5×104; (b) Re=3.1×104; (c) Re=4.1×104; and (d) Re=6.2×104

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Figure 9

Flow characteristics: (a) separation point; (b) Strouhal number; and (c) drag coefficient

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Figure 10

Local Nusselt number distributions around the cylinder: (a) pattern A (L∕D=1.75, d∕D=0.05); (b) pattern B (L∕D=1.25, d∕D=0.25); and (c) pattern B (L∕D=1.75, d∕D=0.25)

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Figure 11

Local Nusselt number distributions around the cylinder Re=6.2×104: (a) L∕D=1.0, d∕D=0.25, pattern B; (b) L∕D=1.25, d∕D=0.3, pattern B; (c) L∕D=1.75, d∕D=0.15, pattern A; and (d) L∕D=2.5, d∕D=0.25, pattern A

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Figure 12

Average Nusselt number: (a) front face and (b) rear face

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Figure 13

Overall Nusselt number: (a) variation with L∕D and d∕D and (b) comparison of the present study with square prisms

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Figure 14

Contour map of the rate of heat transfer enhancement of the cylinder: (a) Re=2.1×104; (b) Re=4.1×104; and (c) Re=6.2×104

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