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Research Papers: Forced Convection

# An Experimental Study on Heat Transfer Around Two Side-by-Side Closely Arranged Circular Cylinders

[+] Author and Article Information
Takayuki Tsutsui

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

J. Heat Transfer 132(11), 111704 (Aug 16, 2010) (8 pages) doi:10.1115/1.4002147 History: Received December 16, 2009; Revised July 06, 2010; Published August 16, 2010; Online August 16, 2010

## Abstract

The present paper describes heat transfer around two side-by-side closely arranged circular cylinders. The flows around two circular cylinders in a side-by-side arrangement can be classified into three flow patterns according to the gap between the two cylinders. The heat transfer characteristics of the cylinders in each flow regime were experimentally investigated. The diameter of the circular cylinders was 40 mm and the gap between the two cylinders varied from 4 mm to 40 mm. The free stream velocity ranged from 4 m/s to 24 m/s, resulting in Reynolds nos. ranging from $1.1×104$ to $6.2×104$. The local heat transfer coefficient of both cylinders was measured. The overall Nusselt no. of the two cylinders was found to be minimum at $G/D(=gap/diameter)=0.4$, which is the minimum drag coefficient condition of the two cylinders, too.

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## Figures

Figure 1

Strouhal no. and three typical flow patterns

Figure 2

Coordinate system and notation

Figure 3

Experimental model and measurement system: (a) constant-heat-flux model and (b) heat transfer measurement system

Figure 4

Pressure measurement system

Figure 5

Flow visualization around the two cylinders (Re=3.1×104): (a) single cylinder, (b) G/D=0.1, (c) G/D=0.2, (d) G/D=0.3, (e) G/D=0.4, (f) G/D=0.6, and (g) G/D=1.0

Figure 6

Local Nusselt no. distributions: (a) single cylinder, (b) G/D=0.1, (c) G/D=0.2, (d) G/D=0.3, (e) G/D=0.4, (f) G/D=0.6, and (g) G/D=1.0

Figure 7

Correlation among Nuf, Nur, and the gap ratio: (a) cylinder no. 1 and (b) cylinder no. 2

Figure 8

Average Nusselt no. of cylinder nos. 1 and 2: (a) G/D=0.1, (b) G/D=0.2, (c) G/D=0.3, (d) G/D=0.4, (e) G/D=0.6, and (f) G/D=1.0

Figure 9

Average Nusselt no. of the two cylinders

Figure 10

Correlation between average Num and the gap ratio

Figure 11

Pressure coefficient distribution (G/D=0.4 and Re=4.2×104)

Figure 12

Drag coefficient (Re=4.2×104)

Figure 13

Velocity and turbulence intensity distributions behind two cylinders: (a) G/D=0.1, (b) G/D=0.2, (c) G/D=0.3, and (d) G/D=1.0

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