Abstract
Mixing T-junctions are encountered in many industrial applications. This study has been conducted to clarify how two fluids with different characteristics are mixed turbulently in a cross-flow type. T-junction. The velocity field in the channel is investigated by PIV, and visualization is conducted to see the behavior of the interface between two flows in the mixing section by oil smoke. We extracted the dominant structures of the velocity field and concentration field by POD analysis. It is clarified that the interface of two flows is oscillating vertically and mushroom-like eddies are superposed on it. We have concluded that the vertical oscillation of the interface is caused by the fluctuation of the streamwise velocity component, and the mushroom-like eddies are caused by the vertical fluctuating velocity; the former produces the streamwise turbulent heat flux, and the latter produces the vertical one.
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