Library Subscription: Guest
Home Begell Digital Library eBooks Journals References & Proceedings Research Collections
Computational Thermal Sciences

ISSN Print: 1940-2503
ISSN Online: 1940-2554

Computational Thermal Sciences

DOI: 10.1615/ComputThermalScien.v1.i4.10
pages 361-383

EFFECT OF OPERATING FREQUENCY ON HEAT TRANSFER IN A MICROCHANNEL WITH SYNTHETIC JET

Dan Li
School of Mechanical and Manufacturing Engineering, University of New South Wales
Victoria Timchenko
School of Mechanical and Manufacturing Engineering, The University of New South Wales, Sydney 2052, Australia
John A. Reizes
University of Technology; and School of Mechanical and Manufacturing Engineering, University of New South Wales, Sydney, NSW 2052, Australia
Eddie Leonardi
Computational Fluid Dynamics Research Laboratory, School of Mechanical and Manufacturing Engineering, The University of New South Wales, Sydney, Australia 2052

ABSTRACT

Microchannels with synthetic jet cooling devices etched in the silicon chip effectively lower the maximum chip temperature; however, in order to optimize the heat transfer, the effect of operating frequency of the synthetic jet needs to be understood. A parametric study was performed to investigate the effect of frequency of the jet at a constant jet Reynolds number. While at all frequencies there is significant reduction of the maximum temperature of the wafer below that with a steady flow in the microchannel, the difference between the three frequencies used is only 2 K. This difference is due to the redistribution of the local heat flux; in particular, to an increase with frequency in the local heat flux at the silicon wafer-fluid interface upstream of the orifice. The reduction in the mean velocity of the flow is responsible for there being hardly any difference between the results at the two higher frequencies.