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Condensed Matter Seminars
| SPECIAL SEMINAR
Thursday, July 20, 2000
Material Science, Room 125
Note special time.
Note special room.
[Host: Bellave S. Shivaram]
United Technologies Corporation Professor of Acoustics - Penn State University
The interaction of heat and sound has been a
subject of interest to scientists and engineers since 1816
when Laplace corrected Newton's attempt to derive the speed
of sound in air from first principles. Glassblowers
observed the generation of sound in the presence of
temperature gradients even earlier. It was less than
twenty years ago that the reverse process - the use of
high-amplitude sound to produce refrigeration - was first
demonstrated. Due to the discovery of the
"hole-in-the-ozone" and the ratification of the Montreal
Protocols, research in "thermoacoustics" has accelerated
during the past decade. In 1992, an electrically-powered
thermoacoustic refrigerator was placed in orbit on the
Space Shuttle and a larger thermoacoustic chiller for
shipboard electronics was demonstrated for a week on board
a US Navy destroyer in 1995. More recently, a heat-driven
thermoacoustic device was used to liquefy in excess of 100
gal/day of natural gas by burning part of the gas stream.
This presentation will include a simple description of the
thermoacoustic heat pumping process and will describe some
of the novel devices that have exploited this process.
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