THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS 345 E. Comparisons of Rational Engineering Correlations of ThermophoreticallyAugmented § Particle Mass Transfer with STAN5-Predictions for Developing Boundary Layers

ABSTRACT Fouling (and corrosion) of gas turbine (GT) blading often results from the deposition of materials derived from inorganic impurities in the fuel and/or ingested air. When the depositing material is in the form of a submicron "aerosol" (dust or mist) it has been found that the rates of deposition on cooled surfaces can be augmented by some 100-1000-fold via the mechanism of thermophoresis (particle migration down a temperature gradient). For this reason, in earlier papers we reported the development of rational, yet simple, engineering correlations of thermophoreticallyaugmented particle transport across both laminar boundary layers (LBLs) and turbulent boundary layers (TBLs). While developed based on theoretical considerations, and numerical computations of selfsimilar LBLs and law-of-the-wall (Couette flow-like) TBLs, these mass transfer coefficien