Free convection occurs between concentric spheres.The
Chapter 9, Problem 9.104(choose chapter or problem)
Free convection occurs between concentric spheres.The inner sphere is of diameter Di?50 mm and tem-perature Ti?50?C, while the outer sphere is main-tained at To?20?C. Air is in the gap between thespheres. What outer sphere diameter is required so thatthe convection heat transfer from the inner sphere is thesame as if it were placed in a large, quiescent environ-ment with air at T??20?C?
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