ABSTRACT
Optical (visible light) techniques are described whereby time-resolved temperature and heat transfer distributions at the interface between a wall and fluid or within a substrate can be measured in great detail. Much more information can be obtained than through the use of point sensors (e.g., thermocouples, resistance thermometers, or heat flux sensors). The techniques to be discussed are luminescence-based measurements using temperature-sensitive paints (TSPs) and phosphors distributed onto a surface or within a co-doped substrate. Measurement principles are first discussed, and the technique is compared to other methods of measuring temperature distributions. The technique is then applied to measure wall temperature and heat flux distributions during pool boiling and flow boiling.
