Interaction Between Convection and Surface Reactions in Pressure, Volume, Temperature (PVT) in Rectangular, Horizontal Enclosures

摘要

One dimensional diffusive transport in closed ampoules is described. Numerical solution of the two dimensional nonsteady transport equations were obtained by a finite difference method, carried out as a function of the chemical surface reaction rate, the diffusion coefficient, and the gravity level values. It is found that a model with boundary conditions based on interfacial equilibrium is a zero order asymptotic description for infinite surface reaction rates. High diffusion coefficients lead to a uniform concentration field and vanishing solutal convection. Concentration on active surfaces may be affected by convection: it is quite uniform for low gravity level and is strongly disturbed for Earth level gravity. The surface concentration profile is increasingly coupled with convection the smaller the reaction rate is.