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Proceedings of the 25th National and 3rd International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2019)

ISSN: 2688-7231 (Online)

Natural Convection Cooling of a Stack of Three Horizontal Cylinders in Laminar Regime

Subhasisa Rath
School of Energy Science & Engineering, IIT Kharagpur, West Bengal, India- 721302

Sukanta Kumar Dash
School of Energy Science & Engineering, IIT Kharagpur, West Bengal, India- 721302; Department of Mechanical Engineering, IIT Kharagpur, West Bengal, India- 721302

DOI: 10.1615/IHMTC-2019.140
pages 80-84

要約

The present work is intended to investigate the natural convection heat transfer from a stack of three solid horizontal cylinders numerically in a three dimensional computational domain. Simulations were conducted in the laminar flow regime of Rayleigh number spanning in the range (104 ≤ Ra ≤ 108) and length to diameter ratio in the range (0.5 ≤ L/D ≤ 20). The thermal fields are visualized in terms of temperature contours while heat transfer characteristics are elucidated in terms of the average Nusselt number (Nu). The average Nusselt number shows a positive dependence on Ra for all L/D. Furthermore, the average Nu is found to be significantly higher for short cylinders and decreases with increase in L/D up to 15 and remain constant for long cylinders. In the present study, an attempt has been made to compare the present 3D simulation results for the extreme case of L/D = 20 with the 2D numerical results of Rath and Dash [6] in order to justify the use of 2D simulations.

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