This paper deals with extensive numerical studies on heat transfer characteristics and fluid dynamics inside several impingement cooling devices combined with pins. As a numerical analysis tool, a commercial software CFX-4.4, AEA Technology, is used. The purpose of this paper is two-fold. First the validity of the numerical tool and grids adopted in this study is checked through the comparison of the numerical results with the experimental counterparts. Turbulence models available in the software are thoroughly tested so as to screen out a turbulence model among them which can reproduce the experimental heat transfer characteristics best. Consequently, k–ω turbulence model is finally adopted as the turbulence model. Parametric studies, where Reynolds number based on impingement hole diameter, pin height-diameter ratio and pin pitch-diameter ratio vary from 5,000 to 25,000, from 0.75 to 4 and from 2 to 4, respectively, are then executed to clarify effects of important dimensions, such as pin height, pin pitch, upon local and averaged heat transfer characteristics as well as pressure loss generated in the devices.

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