Development of measuring method of instantaneous concentration distribution in mixing flow and clarification of its unsteady characteristics

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In this study, we developed a measuring method of instantaneous concentration distributions in turbulent flow based on the results of flow visualization. We applied this method to the turbulent mixing in a cross-flow type T-junction. By analyzing the measured instantaneous concentration distributions with the proper orthogonal decomposition, we extracted large scale periodic fluctuations of the mixing interface between two flows mixed in the T-junction. Then, the turbulent heat/mass transfer process in the T-junction was made clear by combining these data with the measured results of velocity and turbulent heat fluxes.