Condensation coefficient of water

✍ Scribed by K. Nabavian; L.A. Bromley

• Publisher: Elsevier Science
• Year: 1963
• Tongue: English
• Weight: 846 KB
• Volume: 18
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(63)85035-6

✦ Synopsis

Measurements

were made during rapid condensation of pure steam in a system designed to minimize all thermal resistance in series with the interfacial vapour-liquid thermal resistance.

The system consisted of a horizontal copper tube with a grooved outer surface on which condensation occurred and through which cold water flowed at very high velocity.

From numerous measurements at steam temperatures of near 10°C and near 5O"C, it was possible to calculate values for the condensation coefficient, 01, as given by the Hertz-Knudsen equation (see equation 4).

The results indicate a probable range for 01 of 0.43 < 01 < 2.0. This wrresoonds to a value of (r (the fraction of the molecules which "stick" upon striking the liquid surfa& of between 0.35 and i.0.