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ISBN : 978-1-56700-478-6

Proceedings of the 24th National and 2nd International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2017)
2017, December 27-30 , BITS Pilani, Hyderabad, India

THREE DIMENSIONAL MODELING OF NATURAL CONVECTION HEAT TRANSFER FROM A SHORT OR LONG CYLINDER WITH CONSTANT WALL HEAT FLUX

Get access DOI: 10.1615/IHMTC-2017.3120
pages 2231-2239

Abstract

Three dimensional conservation equations for mass, momentum and energy have been solved numerically to predict the natural convection flow and temperature field around a short or long solid horizontal cylinder in air in the laminar range of modified Rayleigh number spanning from 104 to 108. Simulations have been done for L/D in the range of 0.05 ≤ L/D ≤ 20 for solid cylinders suspended in air. Interesting flow structures around the solid cylinder have been observed for small and large L/D. It can be found that Nu for a short cylinder is higher than that of Nu for a long cylinder in air for all Ra. New correlations for the average Nu have been developed as a function of L/D (0.05 ≤ L/D ≤ 20) and Ra (104 to 108) for the cylinder. The correlations developed are accurate to the level of ±6% which can be readily used in the industry and academics.
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