A Numerical Study on Flow and Heat Transfer Characteristics for an Oblique Impingement Jet Using $\small{k-{\varepsilon}-\bar{\upsilon{$ Model

Title & Authors
A Numerical Study on Flow and Heat Transfer Characteristics for an Oblique Impingement Jet Using $\small{k-{\varepsilon}-\bar{\upsilon{$ Model
Choe, Yeong-Gi; Choe, Bong-Jun; Lee, Jeong-Hui;

Abstract
The numerical simulation has been conducted for the investigation of flow and heat transfer characteristics of an oblique impingement jet injected to a flat plate. The finite volume method was used to discretize the governing equations based on the non-orthogonal coordinate with non-staggered variable arrangement. The $\small{textsc{k}}$-$\small{\varepsilon}$-ν(sup)'2 turbulence model was employed to consider the consider the anisotropic flow characteristics generated by the impingement jet flow. The predicted results were compared with the experimental data and those of the standard $\small{textsc{k}}$-$\small{\varepsilon}$ turbulence model. The results of the $\small{textsc{k}}$-$\small{\varepsilon}$-ν(sup)'2 model showed better agreement with the experimental data than those of the standard $\small{textsc{k}}$-$\small{\varepsilon}$ model. In order to get the optimum condition, the flow and temperature fields were calculated with a variation of inclined angle($\small{\alpha}$=30$\small{^{\circ}}$~90$\small{^{\circ}}$) and the distance between the jet exit and impingement plate-to-diameter (L/D=4~10) at a fixed Reynolds number(Re=20,000). For a small L/D, the near-peak Nusselt numbers were not significantly effected by the inclined angle. The near-peak Nusselt numbers were not significantly affected by the L/D in the case of a large $\small{\alpha}$. The overall shape of the local Nusselt numbers was influenced by both the jet orifice-to-plate spacing and the jet angle.
Keywords
Oblique Impingement Jet;$\small{k-{\varepsilon}-\bar{\upsilon{$ Model;Near-Pear Nusselt Number;
Language
Korean
Cited by
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