Probability Analysis of Pit Initiation on Austenitic Stainless Steels

AbstractThe influence and mechanism of microscopic pit initiation on austenitic stainless steels were analyzed. Based on the electrochemical theory, a model was proposed to judge the pit initiation on austenitic stainless steels in the weak acidic chloride solution. Although the model was developed based on deterministic equations, it can be used to analyze the randomness of pit initiation. Furthermore the probability distribution of major parameters was also discussed. This study enriches the stochastic theory of pit initiation

Numerical simulation of film condensation on vertical plate embedded in metallic foams

Film condensation on vertical plate embedded in metal foams was numerically investigated based on some modification for Nusselt theory. Related numerical model was established by introducing Brinkman-Darcy model. Advection and inertial force in the condensate film were considered, from which the non-linear effect of cross-sectional temperature distribution on condensation heat transfer was also involved. Condensation characteristics were discussed and compared with those on smooth surface. Effects of key parameters on condensate film thickness were examined. Furthermore, with either the increase in porosity or the decrease in pore density, the condensate layer becomes thinner