Accurate repeatable data are presented for condensation of atmospheric pressure steam on three rows of integral-fin tubes situated in a bank of plain tubes. The data cover a wide range of vapor velocities and heat fluxes. Unlike previously reported data for plain tubes using the same test bank and apparatus, the heat-transfer coefficients for the finned tubes were unaffected by vapor velocity. When compared to a plain tube of fin-tip diameter and at the same vapor side temperature difference, enhancement ratios between 3.7 and 4.9 were found for the finned tubes compared to a plain tube in quiescent vapor conditions, while values between 1.9 and 3.9 were found when compared to a plain tube at the same vapor velocity.

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