ISSN Online: 2377-424X
ISBN Print: 1-56032-797-9
International Heat Transfer Conference 11
EXPERIMENTAL INVESTIGATION ON THERMAL TURBULENT DIFFUSION IN A HEATED JET USING OPTICAL METHOD
摘要
This paper presents an efficient technique for the characterization of the thermal transport properties in turbulent flows. The method is based on the temperature dependence of the fluorescence, induced by a laser radiation, of an organic dye. The laser-induced fluorescence technique is combined with the 2D laser Doppler anemometry, in order to measure simultaneously and instantaneously, in the same sample volume, the temperature and the velocity. The technique is demonstrated on a turbulent heated round jet: the mean and fluctuating dynamic and thermal fields are investigated, and the temperature-velocity cross-correlation are determined in order to characterize the turbulent diffusivity and the turbulent Prandtl number.