Enhancement of Heat Transfer through Jet Impingement by Using Detached Ribs


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Abstract


Impinging jets provide an effective and flexible way to transfer thermal energy in various industrial applications. A computational investigation on the enhancement of heat transfer in air jet impingement over a flat smooth surface using detached ribs is performed in the present paper. The function of ribs is to make the flow turbulent, which results in an enhancement of the heat transfer. Fluid flow and heat transfer characteristics are studied in the computational domain using the RANS equations. It is observed that the accelerating fluid in the clearance between the ribs and plate causes a significant increase in the local turbulence and flow recirculation and these lead to an increased local heat transfer. A comparison of turbulence intensity and velocity profile at different sections in the vicinity of the ribs is performed. It is observed that none of the four turbulence models considered, namely, the standard k-ε model, RNG k-ε model, realizable k-ε model and k-ω model, accurately capture the variation of the local Nusselt number along the plate. However, the standard k-ε model performs the best.
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Keywords


Enhanced Heat Transfer; Turbulence; CFD; k-ε Turbulence Model; Impingement

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References


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