EXPERIMENTAL STUDY OF HIGH-RAYLEIGH-NUMBER CONVECTION IN A HORIZONTAL CAVITY WITH DIFFERENT END TEMPERATURES.
The paper summarizes results from an experimental study of buoyancy-induced motion and heat transfer in a hoizontal rectangular cavity with the two vertical ends at different temperatures and the long horizontal walls adiabatic. The high-Rayleigh-number range reported has not been studied before. It is shown that, contrary to lower-Rayleigh-number behavior, the core flow structure is nonparallel and is dominated by horizontal intrusions flowing along each of the two insulated horizontal walls. The fluid embraced by the two horizontal jets is practically stagnant and thermally stratified. Flow visualization experiments suggest that adjacent to the two horizontal jets two secondary flat cells are formed by the baroclinic pressure field analogous to stratified fluid intrusions. Nusselt-number - Rayleigh-number results for the overall heat transfer horizontally are reported and compared with previous experimental and theoretical results available for lower Rayleigh numbers. Refs.