Natural convection between a vertical cylinder and a surrounding array

The generic situation considered is natural convection between a single heated, vertical cylinder and a surrounding array of cooler vertical cylinders in a triangular pattern. The ratio of the test section temperature to the cooling tube temperature was varied up to 2.6 by adjusting the electrical power. The Rayleigh number, based on test section diameter and air properties evaluated at cooling tube temperature, ranged from 2.9 × 104 to 4.6 × 105. Results indicate that the convective heat transfer data could be approximated as NuD(Tts/Tct)0.14 = 0.156 RaD13 in the apparent turbulent region for RaL > 1.2 × 1011.

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