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research-article

Numerical and experimental analysis of impinging synthetic jets for cooling a point-like heat source

[+] Author and Article Information
Robert Glowienko

Institute of Fluid Mechanics, FAU Erlangen-Nuremberg
robert.glowienko@audi.de

Hans Derlien

Institute of Fluid Mechanics, FAU Erlangen-Nuremberg
hans.derlien@gmx.de

Ozgur Ertunc

Professor, Mechanical Engineering Department, Ozyegin University Istanbul
ozgur.ertunc@ozyegin.edu.tr

Antonio Delgado

Professor, Institute of Fluid Mechanics, FAU Erlangen-Nuremberg
antonio.delgado@fau.de

1Corresponding author.

ASME doi:10.1115/1.4038547 History: Received January 03, 2017; Revised October 13, 2017

Abstract

This paper investigates the use of synthetic jets as impinging jets numerically and experimentally. Synthetic jets are generated by the periodic movement of a diaphragm within a cavity that is connected to the ambient fluid via an orifice. It is typically used in technical applications for active flow control and cooling of (point) heat sources. The latter, as a potential method for cooling high-performance LEDs, is the original motivation for this and other papers by the author. The paper describes the structure of the jet ejector and test bench, the CFD model itself and its boundary conditions. Jets of various amplitudes and frequencies are visualised using high-speed cameras. The calculation method is used for detailed analyses of specific configurations of impinging jets. At first the flow behaviour of synthetic jets as impinging jets is considered numerically and experimentally. The effect of the impact plate on the transition behaviour of the jets is analysed. Subsequently this work looks at the cooling of the heat source. The influence of the orientation of the jet on heat transfer, the reduction of heat transfer at increased ambient temperature and as a result of oscillations of the test bench are investigated experimentally. A more detail look at a laminar impinging jet to cool the heat source follows then by simulation. The numerical consideration of a disruption of jet propagation by lateral inflow of impact vortices and a comparison of measurement and simulation of the Nusselt numbers concludes this article.

Copyright (c) 2017 by ASME
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