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Experimental Investigations on Synthetic Jet Impingement Heat Transfer

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Document pages: 11 pages

Abstract: Synthetic impingement is an attractive cooling mechanism due to the capability of achieving high heat transfer rates. The flow characteristics of synthetic jets are highly complex and consequently the heat transfer from the target surface is highly variable. The current research investigates the heat transfer characteristics of synthetic jet impingement cooling applied to thermal management of electronic systems. Synthetic jet is produced by a piston-cylinder arrangement. The major parameters identified to describe the synthetic jet heat transfer are Reynolds number, jet to plate spacing, orifice geometry and frequency of the jet. The cooling medium used is air. The experiments are performed for the jet Reynolds number (Re) of 12000, with dimensionless distance between the nozzle and plate surface(Z D) ranging from 2 to 16 and orifice diameter (D) ranging from 3 to 5 mm. The results show that the average Nusselt number increases with frequency of the jet. The optimum Z D corresponding to maximum heat transfer is high in the synthetic jet, as compared to that in a continuous jet. Synthetic jet introduces a stronger entrainment and more vigorous penetration in the surrounding fluid. In the case of circular orifice, the heat transfer characteristics of smaller diameter orifice are better at high Z D ratios. The rectangular orifice has higher heat transfer characteristics as compared to circular and square jets for the same hydraulic diameter.

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