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Research Papers

Effect of Channel Confinement on Mixed Convective Flow Past an Equilateral Triangular Cylinder

[+] Author and Article Information
Nitish Varma

Department of Mechanical Engineering,
National Institute of Technology Rourkela,
Rourkela 769008, India

Jay P. Dulhani

Department of Mechanical Engineering,
Indian Institute of Science Bangalore,
Bangalore 560012, India

Amaresh Dalal

Department of Mechanical Engineering,
Indian Institute of Technology Guwahati,
Guwahati 781039, India
e-mail: amaresh@iitg.ernet.in

Sandip Sarkar

Department of Mechanical Engineering,
Indian Institute of Science Bangalore,
Bangalore 560012, India;
Research and Development Division,
Tata Steel Ltd.,
Jamshedpur 831007, India

Suvankar Ganguly

Research and Development Division,
Tata Steel Ltd.,
Jamshedpur 831007, India

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received May 31, 2014; final manuscript received December 24, 2014; published online August 11, 2015. Assoc. Editor: Suman Chakraborty.

J. Heat Transfer 137(12), 121013 (Aug 11, 2015) (7 pages) Paper No: HT-14-1370; doi: 10.1115/1.4030960 History: Received May 31, 2014

The present work investigates the mixed convective flow and heat transfer characteristics past a triangular cylinder placed symmetrically in a vertical channel. At a representative Reynolds number, Re = 100, simulations are carried out for the blockage ratios β=1/3,1/4,and1/6. Effect of aiding and opposing buoyancy is brought about by varying the Richardson number in the range -1.0Ri1.0. At a blockage ratio of 1/3, suppression of vortex shedding is found at Ri = 1, whereas von Kármán vortex street is seen both at β=1/4 and 1/6, respectively. This is the first time that such behavior of blockage ratio past a triangular cylinder in the present flow configuration is reported. Drag coefficient increases progressively with increasing Ri and a slightly higher value is noticed at β=1/3. For all β, heat transfer increases with increasing Ri. Flattening of Nuavg –Ri curve beyond Ri>0.75 is observed at β=1/3.

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Figures

Grahic Jump Location
Fig. 1

(a) Schematic of problem geometry. (b) A magnified view of the grid nearer to the cylinder.

Grahic Jump Location
Fig. 2

Instantaneous contours of (a) vorticity, (b) streamlines, and (c) isotherms at β = 1/3, 1/6, and for various Ri

Grahic Jump Location
Fig. 3

Variations of (a) CD, (b) CL,rms, (c) CM, and (d) St with Ri, for different β

Grahic Jump Location
Fig. 4

Variations of local Nusselt number over the cylinder surface for (a) different β and at Ri = −0.5 and (b) for different Ri and at β = 1/3

Grahic Jump Location
Fig. 5

Variation of average Nusselt number with Ri and for different β

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