Heat transfer coefficients have been determined for steam condensing on a 1-in-dia vertical tube, rotating on its axis. The condensing heat transfer coefficients increased with speed of rotation and for the maximum rotational speed of 2700 rpm investigated were found to be four or five times the stationary value. When the results were plotted in terms of the pertinent parameters of Nusselt number and Weber number, the Nusselt number was found to be constant for Weber numbers below 500, and above this the correlating equation was NNUA, = 6.13 $NWC0.496$.

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