Some Really Cool Speakers
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Cog·i·ta·tion [koj-i-tey'-shun] – noun: Concerted thought or
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Kirt [kert] – proper noun: RF Cafe webmaster.
at Georgia Tech have come up with a novel localized cooling device that
promises to replace the ubiquitous CPU fan and other such applications.
uses vibrating diaphragms (essentially speakers), driven
at 100 to 200 Hz, to force puffs of air out through openings in its
cavities, and through cooling fins. Efficiency and effectiveness are
improved by using less current, making less noise and lower vibration
levels. The resulting puffs of air churn through the thermal boundary
layer that forms normally when a steady airflow is applied. Innovative
Fluidics has purchased a license for commercial exploitation, and plans
to sell the devices in 2005.