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Abstract
Measurements are reported of surface temperature during the dropwise condensation of steam at atmospheric pressure on copper surfaces promoted by montan wax, over the heat flux range 10 000–200 000 Btu/ft 2h. Steam flow rate was varied between about 10 and 80 ft/s and the non-condensable gas concentration from 2 to 500 ppm. The steamside heat-transfer coefficient was found to increase with increasing heat flux and steam velocity. The addition of non-condensable gas lowered the coefficient, carbon dioxide having a greater effect than nitrogen. Maximum values of the coefficient exceeded 50 000 Btu/ft 2h degF, which would indicate that the condensation coefficient for water exceeds 0.04.
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