Theory of the Reaction Surface with Freezing Lewis Number Not Equal to 1 and Its Application in the Oxidation-Sublimation Coupling Process

摘要

This paper presents a theoretical analysis on the reaction surface of a locally similar laminar boundary layer with addition of mass and chemical reaction. Heat transfer and mass transfer correlations under the condition freezing Lewis Number not equal are derived. As an application of the theory of the reaction surface, the oxidation sublimation coupling process on the surface material is investigated. The transition mechanism and transformation condition of the oxidation and sublimation processes from rate-controlled to diffusion-controlled regimes are described. The phenomenon that the rate-sublimation is involved in diffusion-controlled oxidation regime is shown. Comparisons with the experimental data are made for the case of graphite stagnation ablation, and quantitative agreement is found. (Translations, China, Chinese Language, Reprints)