Áramlásba helyezett fűtött rúd felületi hőmérsékleteloszlásának kísérleti meghatározása

Abstract

The experiment of the flow around rod has been searched by many researchers. The object of this study to analyze the flow around a Ød=10 mm diameter electrical heated rod that was placed in low speed flow (mainly laminar flow). The wall temperature Tw, widely found in the literature, is generally considered to be constant, because experimental measurements are carried out using mostly small diameter (max. ~2 mm) electrically heated rods [1,2]. In our case the diameter of the rod is Ød=10 mm, raising the question to whether the temperature distribution of the cylindrical surface depends on the flow direction at the angle measured. The surface temperature of a horizontally placed heated cylinder in an airflow was measured by thermo-graphic camera. The cross surface temperature was examined at different air speeds and different intensity of cylinder heating.