- 作者: Chao-Cheng Lee and Chin-Cheng Chen
- 中文摘要: --
- 英文摘要: The classical nucleation theory was employed to calculate the value of contact angle between solid and liquid at which the same number of critical nuclei per unit volume per unit time (nucleation probability) was produced by homogeneous and heterogeneous nucleation. Such a critical contact angle can be used to judge whether heterogeneous or homogeneous is going to happen first in a system containing a supersaturated vapor and particles. Water and 12 families of organic compounds were tested. The simulation shows that the critical contact angle increases with the particle size, and decreases with the nucleation probability. Large critical angle favors heterogeneous nucleation. As a nucleation probability is less than a certain value, the lower the temperature is, the larger the critical contact angle is; but at a nucleation probability higher than the value, the higher the temperature is, the larger the critical contact angle is. For different compounds, supersaturations required for the organic vapors in the same family with low dipole moment increase with acentric factor, in agreement with that predicted by the corresponding state correlation. An approximately same critical contact angle is observed for organic vapors in the same family except for families of alkanol, acid, ester and chloromethane, this observation is in agreement with the corresponding state correlation.
- 中文關鍵字: --
- 英文關鍵字: --