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Synthetic Jet Based Thermal Management Solutions with High Reliability and Low Acoustics
Keywords: Synjet aircooling, High heat transfer, low acoustics, High Reliability
This paper describes an innovative air cooling technology based on synthetic jets (Synjets) that provide an alternative air cooling approach for meeting the increasing thermal needs of the electronics industry. A synthetic jet is an intense, small-scale turbulent jet synthesized directly from the fluid in which it is embedded. The jet is formed when fluid is alternately entrained and ejected from the cavity by the motion of a diaphragm bounding the cavity, so that there is no net mass addition to the system but a positive momentum flux in the direction of the jet. The zero-mass flux nature of the jet precludes the need for input piping or complex fluidic packaging. The high momentum synthetic jet flow also creates a jet ejector effect inducing a secondary flow that is typically 2 to 10 times the mean flow generated by the jet. Some of the key attributes of the technology, including reliability, acoustics and power consumption are discussed using test data. Due to the higher heat transfer coefficients produced by the jets, they need lower flow rates, and thus produce lower acoustic emissions than a conventional fan. Since synthetic jet actuators have no moving parts in friction, Synjet reliability is orders of magnitude higher than traditional fans, as demonstrated by accelerated lifetime test data. No friction and lower flow rate requirements result in lower power consumption for synthetic jets. Also, since Synjets do not have an inlet and an outlet like a conventional fan, unique form factors can be realized to accommodate strict geometric constraints. In the paper, specific cooling solutions are presented that illustrate several unique implementations of synthetic jets.
Raghav Mahalingam, Director of Product Development
Nuventix, Inc.
Austin, TX

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