Experiments on Heat Transfer From Spheres Including Combined Natural and Forced Convection

Experiments on heat transfer between spheres and airflow were carried out in the range of Reynolds numbers from 3.5to 1.44 x 10/sup 5/ and Grashof numbers from 1 to 10/sup 5/. Empirical formulas for forced, natural, and combined convection are presented and comparison made with other investigations. A graphical procedure, based on experimental results, is used to predict the heat- transfer performance for combined natural and forced convection. (auth)