Eventos Anais de eventos
ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
NUMERICAL SIMULATION OF TANGENTIAL SLOT SYNTHETIC JETS IN CHANNEL
Submission Author:
Adriano Silva , RS , Brazil
Co-Authors:
Conrad Lee
Presenter: Adriano Silva
doi://10.26678/ABCM.ENCIT2016.CIT2016-0354
Abstract
The use of components and electronic devices with high power or data processing capabilities causes great heat generation. This fact, associated to with the technological trend toward miniaturization creates large heat fluxes that must be removed from within the electronic component to ensure performance and durability. Conventional aircooling systems of the “cooler" type have shown deficiencies in dealing with this large heat dissipation requirement since this techniques rely on a large enough volumetric flowrate of air. Synthetic jets can be applied either as an alternative or a supplementary aid to air-cooling systems. A synthetic jet is created by the oscillation of a membrane inside a cavity, which induces the ejection and suctioning of fluid through a narrow orifice. Fluid ejected from the cavity displaces far enough so that is not drawn back inside the cavity by the oscillatory movement of the membrane. The resulting jet plume has average velocity and jet growth similar to a steady jet but contain higher turbulence levels and mass entrainment at the edges. Consequently, synthetic jets can greatly enhance mixing and increase heat transfer from a surface. Much attention has been given to impacting configurations, in which the jet plume is directed normal to a heated surface for hotspot cooling. However, tangential configurations, in which the jet plume is directed to blow along a heated surface, are more suitable for electronic cooling where finned heat exchangers are used. Consequently the purpose of this study is to create a fully 3-D model of a tangential jet generator operating with a compressible fluid. Simulation results are validated against a classic steady channel flow and experimental results of a synthetic jetdriven mean channel flow.
Keywords
CFD, synthetic jets, tangential blowing
