7-2, Losses by Natural Convection from a Cylinder. A vertical cylinder 76.2 mm in diameter and 121.9 mm high is maintained at 397.1 Kat its surface. It loses heat by natural convection to air at 294.3 K. Heat is lost from the cylindrical side and the flat circular end at the top. Calculate the heat loss neglecting radiation losses. Use the simplified equations of Table 4.7-2 and those equations for thelowest range of NGr Npr. The equivalent Lto use for thetop flat surface is 0.9 times the diameter.

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