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TECHNICAL PAPERS: Jets, Wakes, and Impingements

Effect of Outflow Orientation on Heat Transfer and Pressure Drop in a Triangular Duct With an Array of Tangential Jets

[+] Author and Article Information
J.-J. Hwang, B.-Y. Chang

Department of Mechanical Engineering, Chung-Hua University, Hsinchu, Taiwan 300, R.O.C.

J. Heat Transfer 122(4), 669-678 (May 05, 2000) (10 pages) doi:10.1115/1.1318216 History: Received November 08, 1999; Revised May 05, 2000
Copyright © 2000 by ASME
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References

Figures

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Conceptual view of the internal-cooling circuit of the turbine blade
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Schematically drawing of the flow circuit, test section, and the instrumentation
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The coordinate system and dimension of the test section
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Three different outflow orientations of the triangular duct
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Typical mainstream temperature history in the triangular duct of different axial locations
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Static pressure differences along the bottom wall of the plenum
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Axial distributions of the pressure drop and jet mass flow rate across each jet hole, and the crossflow in the triangular duct
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Visualization of flow divide of orientation 3 by using the surface tuft method
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Pressure-drop coefficient distributions along the triangular duct
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Effect of the outflow orientation on the detailed heat transfer coefficient distribution on the bottom and target walls for Re=21000 and s/d=3.0, (a) orientation 1, (b) orientation 2, and (c) orientation 3
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Effect of the Reynolds number on the detailed heat transfer coefficient distribution on the bottom and target walls for orientation 2  
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Effect of the Reynolds number on the detailed heat transfer coefficient distribution on the bottom and target walls for orientation 3
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Reynolds-number dependence of the area-averaged Nusselt number of the bottom and target walls
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Loss coefficients of the triangular duct as a function of Reynolds number

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