Abstract
The local and mean heat-transfer characteristics have been studied experimentally for air (Prandtl number = 0·7) flowing turbulently in the entrance region of a circular duct revolving about a horizontal axis parallel to the duct axis. One geometry only has been studied. Nominal Reynolds numbers of 5000 to 20000 were used and the boundary conditions were those of uniform initial temperature distribution and uniform wall heat flux. Rotational speeds of 0, 200 and 500 rev/min. were employed and the radius of rotation was 6 in. Results showed that significant increases in heat transfer occurred due to rotation and it has been reasoned that these changes were a result of two effects, namely, the inherent inlet swirl relative to the revolving tube together with Coriolis forces, and centrifugal buoyancy forces. The former was found to be of more significance than the latter.
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