OH CONCENTRATION PROFILES OVER ALUMINA, QUARTZ, AND PLATINUM SURFACES USING LASER-INDUCED FLUORESCENCE SPECTROSCOPY IN LOW-PRESSURE HYDROGEN/OXYGEN FLAMES

Laser-induced fluorescence measurements of OH radical concentration are performed in the post-flame gaseous region of a stoichiometric H2/O2 mixture combusting at 20 Torr. The measurements are taken near surfaces of three different materials [α-alumina (Al2O3), quartz (SiO2), and platinum (Pt) on alumina] at different surface temperatures (from ∼700 to 1100 K). A comparative analysis of some of the factors affecting OH recombination rate are...