Horns as particle velocity amplifiers |
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Authors: | Donskoy Dimitri M Cray Benjamin A |
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Institution: | Stevens Institute of Technology, Hoboken, New Jersey 07030, USA. ddonskoy@stevens.edu |
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Abstract: | Preliminary measurements and numerical predictions reveal that simple, and relatively small, horns generate remarkable amplification of acoustic particle velocity. For example, below 2 kHz, a 2.5 cm conical horn has a uniform velocity amplification ratio (throat-to-mouth) factor of approximately 3, or, in terms of a decibel level, 9.5 dB. It is shown that the velocity amplification factor depends on the horn's mouth-to-throat ratio as well as, though to a lesser degree, the horn's flare rate. A double horn configuration provides limited additional gain, approximately an increase of up to 25%. |
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