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

This study was conducted to clarify how two fluids with different temperature are mixed turbulently in a cross-flow type T-junction. The characteristics of the velocity and temperature fields in the channel were investigated experimentally, and the flow visualization was conducted to make clear the...

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Bibliographic Details
Published in:International journal of heat and fluid flow 2010-10, Vol.31 (5), p.776-784
Main Authors: Hirota, Masafumi, Mohri, Eri, Asano, Hideo, Goto, Hiroki
Format: Article
Language:English
Subjects:
Applied sciences
Chemical engineering
Eddies
Exact sciences and technology
Flow visualization
Fluctuation
Fluid dynamics
Fluid flow
Fluids
Fundamental areas of phenomenology (including applications)
Instrumentation for fluid dynamics
Mixing
Physics
PIV
POD
T-junction
Turbulence
Turbulent flow
Turbulent heat flux
Turbulent mixing
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Summary:This study was conducted to clarify how two fluids with different temperature are mixed turbulently in a cross-flow type T-junction. The characteristics of the velocity and temperature fields in the channel were investigated experimentally, and the flow visualization was conducted to make clear the detailed behavior of the interface between two flows in the flow-merging region. We extracted the dominant structures of the velocity and concentration fields by proper orthogonal decomposition (POD). It is clarified that the interface of two flows is oscillating vertically and several discrete 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 turbulent heat flux in the streamwise direction, and the latter produces that in the vertical direction.
ISSN:0142-727X
1879-2278
DOI:10.1016/j.ijheatfluidflow.2010.04.006