Chemical Engineering Science, Vol.102, 387-396, 2013
Heterogeneous condensation on insoluble spherical particles: Modeling and parametric study
A full heterogeneous condensation model is developed to describe the water vapor condensation on an insoluble spherical particle. The new model divides the whole process of the heterogeneous condensation into three stages: nucleation, transition and growth, and considers the conservation of mass and energy of system. The model is incorporated with the population balance equation and results in a numerical method, and validated by comparison with the experimental data. In addition, two new criteria are proposed to evaluate the ability of heterogeneous condensation. The effects of particle properties and initial conditions on the whole process of heterogeneous condensation are then evaluated. It is found that the relations of the condensation ability with the wetting degree, the particle size or the initial saturation are all different from the monotonous tendency as found in the classical heterogeneous condensation theory. The parametric study suggests that a stronger ability of heterogeneous condensation can be achieved with a medium value of the wetting degree, the particle size, the initial saturation or the initial temperature. (C) 2013 Elsevier Ltd. All rights reserved.