CONDENSATION STUDIES WITH JET STREAM TENSIMETER

Condensation experiments by the jet tensimeter confirm the belief that the condensation (or evaporation) coefficient is unity; there is little or no resistance to molecules crossing the vapor-liquid interface in addition to that imposed by the gas laws. Experimentally determined evaporation rates are sufficiently close to the condensation rates of the same AT. This fact and the agreement between experimental results and thermal gradient calculations show that heat transfer in the liquid region is the controlling factor of the condensation and evaporation rates in most cases. The complication of the acceleration of the liquid jet surface is eliminated experimentally by the use of a “protecting sheath”. © 1969, American Chemical Society. All rights reserved.