High power light emitting diodes (LEDs) being used for low and high beam in automotive lighting need active cooling of their heat sinks by radial or axial fans. But the moving elements of the fan cause abrasion, noise, and high energy consumption. Synthetic jets can replace conventional fans with their disadvantages and allow the directed cooling of LEDs. Therefore, in this paper, flow and heat transfer characteristics of impinging synthetic jets are investigated numerically and experimentally as an alternative to cooling LEDs with fans. It is shown that the impact plate brings forward the laminar-turbulent transition of the jets temporally and spatially. The impact plate itself should not be positioned in the region of the free jet's transition height. Increasing the frequency of the synthetic jet has a greater influence on the heat transfer compared to an increase in amplitude. The maximum cooling performance is achieved for all jet configurations with moderate distances between the orifice and the impact plate. In this case, the jet reaches its highest mass flow and impulse and its lowest temperature.
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Research-Article
Numerical and Experimental Analysis of Impinging Synthetic Jets for Cooling a Point-Like Heat Source
Robert Glowienko,
Robert Glowienko
Institute of Fluid Mechanics,
FAU Erlangen-Nuremberg,
Ingolstadt 85053, Germany
e-mail: robert.glowienko@audi.de
FAU Erlangen-Nuremberg,
Ingolstadt 85053, Germany
e-mail: robert.glowienko@audi.de
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Hans Derlien,
Hans Derlien
Institute of Fluid Mechanics,
FAU Erlangen-Nuremberg,
Ingolstadt 85053, Germany
FAU Erlangen-Nuremberg,
Ingolstadt 85053, Germany
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Oezguer Ertunc,
Oezguer Ertunc
Professor
Mechanical Engineering Department,
Ozyegin University Istanbul,
Istanbul 34794, Turkey
Mechanical Engineering Department,
Ozyegin University Istanbul,
Istanbul 34794, Turkey
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Antonio Delgado
Antonio Delgado
Professor
Institute of Fluid Mechanics,
FAU Erlangen-Nuremberg,
Ingolstadt 85053, Germany
Institute of Fluid Mechanics,
FAU Erlangen-Nuremberg,
Ingolstadt 85053, Germany
Search for other works by this author on:
Robert Glowienko
Institute of Fluid Mechanics,
FAU Erlangen-Nuremberg,
Ingolstadt 85053, Germany
e-mail: robert.glowienko@audi.de
FAU Erlangen-Nuremberg,
Ingolstadt 85053, Germany
e-mail: robert.glowienko@audi.de
Hans Derlien
Institute of Fluid Mechanics,
FAU Erlangen-Nuremberg,
Ingolstadt 85053, Germany
FAU Erlangen-Nuremberg,
Ingolstadt 85053, Germany
Oezguer Ertunc
Professor
Mechanical Engineering Department,
Ozyegin University Istanbul,
Istanbul 34794, Turkey
Mechanical Engineering Department,
Ozyegin University Istanbul,
Istanbul 34794, Turkey
Antonio Delgado
Professor
Institute of Fluid Mechanics,
FAU Erlangen-Nuremberg,
Ingolstadt 85053, Germany
Institute of Fluid Mechanics,
FAU Erlangen-Nuremberg,
Ingolstadt 85053, Germany
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received January 3, 2017; final manuscript received October 13, 2017; published online February 21, 2018. Assoc. Editor: Amy Fleischer.
J. Heat Transfer. May 2018, 140(5): 052201 (8 pages)
Published Online: February 21, 2018
Article history
Received:
January 3, 2017
Revised:
October 13, 2017
Citation
Glowienko, R., Derlien, H., Ertunc, O., and Delgado, A. (February 21, 2018). "Numerical and Experimental Analysis of Impinging Synthetic Jets for Cooling a Point-Like Heat Source." ASME. J. Heat Transfer. May 2018; 140(5): 052201. https://doi.org/10.1115/1.4038547
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