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Experimental study on turbulent mixing process in cross-flow type T-junction

DOI: 10.1615/ICHMT.2009.TurbulHeatMassTransf.2120
page 11

Masafumi Hirota
Department of Micro-Nano Systems Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603; Department of Mechanical Engineering, Mie University, Kurimamachiya-cho 1577, Tsu-city 514-850

E. Mohri
Department of Mechanical Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603; Osaka Plant, KOMATSU, Ueno, Hirakata, Osaka 573-1011, Japan

H. Asano
Nagoya University, Nagoya; and Air-Conditioning Testing and Evaluation Department, DENSO CORPORATION, Showa-cho, Kariya 448-8661

H. Goto
Nagoya University; Nagoya Aerospace Systems Works, Mitsubishi Heavy Industry

Sinopsis

This study has been conducted to clarify how two fluids with different temperature are mixed turbulently in a cross-flow type T-junction. The velocity field in the channel is investigated by PIV, and the flow visualization is conducted to make clear the behavior of the interface between two flows in the flow-merging region. We extracted the dominant structures of the velocity and concentration fields by POD. It is clarified that the interface of two flows is oscillating vertically and several longitudinal 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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