RATE OF SOLID CONDENSATION FROM ORGANIC VAPORS ON A COLD SURFACE

[摘要] References(7)Cited-By(5)Phenomena of solid condensation on a cold disk were observed and the rate was measured for three organic vapors: naphthalene, p-dichlorobenzene and p-dibromobenzene. The condensation process was understood as initial nuleation followed by growth of the nuclei. The rate of condensation N was found to include surface kinetics and was correlated successfully by the equation N=kaCia2) where σ is non-dimensional supersaturation at the surface and is regarded as a driving force for the surface kinetics. The coefficient kσ was correlated by the Arrhenius equation with activation energy larger than the latent heat of sublimation by a factor of about 1.5. It was considered that the surface kinetics governs the condensation rate when the mass transfer rate is very high and when it occurs at relatively low temperatures.