Experiments for the Determination of Convective Diffusion Heat/Mass Transfer to Burner Rig Test Targets Comparable in Size to Jet Stream Diameter

The application of a recently formulated vapor transport theory to predict deposition rates of corrosive salts from alkali-seeded combustion gases of a small-capacity, high-velocity, atmospheric-pressure burner rig was hampered by the relatively large dimensions of the cylindrical deposit collector compared to the diameter of the combustion gas stream. The relative dimensions led to a highly nonadiabatic combustion gas flow around the collector and necessitated two series of experiments. In the first series, mass transfer coefficients were determined by utilizing the naphthalene sublimation technique. The second series of experiments determined the dilution effect on the sodium species concentrations due to the entrainment of ambient air. This second series involved the measurement of the temperature variation along the surface of the collector under steady-state conditions. Vapor deposition rates were determined exploiting this information and the results were found to compare favorably with experimentally obtained rates.