Abstract
A general-purpose expression developed previously for predicting external natural convection heat transfer from three-dimensional bodies of arbitrary shape is extended to cover a wider range of Prandtl numbers: 0.71 ⩽ Pr ⩽ 2000. The predictions from this expression are compared with the experimental data of several researchers over the range 10 6 < Ra < 10 13 for Prandtl numbers of approximately 10 and 2000. The agreement between the predictions and the experimental data is very good with r.m.s. differences of less than 10% in all cases.
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