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Numerical Study on Heat Transfer Characteristics in Impinging Air Jet System  

Kum, Sung-Min (Dept. of Mechanical Eng., Halla University)
Kim, Dong-Choon (Dept. of Mechanical Eng., Kyungmoon College)
Publication Information
Journal of the Korean Solar Energy Society / v.23, no.4, 2003 , pp. 55-61 More about this Journal
Abstract
Heat transfer characteristics for an air jet vertically impinging on a flat plate with a set of hybrid rods was investigated numerically using the RNG k-$\varepsilon$turbulent model. A commercial finite-volume code FLUENT is used. The rods had cross sections of half circular and rectangular shapes. The heating surface was heated with a constant heat flux value of $1020W/m^2$. Parameters investigated were the jet Reynolds number, nozzle -to-plate spacing, the rod pitch and rod-to-plate clearance. The local and average Nusselt number were found to be dependent on the rod pitch and the clearance because installing rods disturbed the flow. Higher convective heat transfer rate occurred in the whole plate as well as in the wall jet region.
Keywords
Impinging air jet; Hybrid rod; Wall jet region;
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