The convection heat transfer rate between a rotating, isothermal sphere and a concentrically located, isothermal outer sphere is experimentally determined for various Grashof and Reynolds numbers. A comparison of data with that for a single sphere rotating in an infinite media is given. The heat transfer rate for the single sphere is higher than for the concentric spheres at the same Reynolds number. The present experiment is shown to involve both free and forced convection heat transfer.
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