Negative group velocity of ultrasonic pulses in a bubbly liquid
Thesis (M.Sc.)--Memorial University of Newfoundland, 2001. Physics and Physical Oceanography Bibliography: leaves 77-78 A wave pulse can propagate with a negative group velocity when it travels through a medium with anomalous dispersion, that is, when the derivative of the dispersion curve is negati...
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ftmemorialunivdc:oai:collections.mun.ca:theses3/196553 2023-05-15T17:23:33+02:00 Negative group velocity of ultrasonic pulses in a bubbly liquid Leary, Del M., 1971- Memorial University of Newfoundland. Dept. of Physics and Physical Oceanography 2001 viii, 78 leaves : ill. Image/jpeg; Application/pdf http://collections.mun.ca/cdm/ref/collection/theses3/id/196553 eng eng Electronic Theses and Dissertations (7.88 MB) -- http://collections.mun.ca/PDFs/theses/Leary_DelM.pdf a1538879 http://collections.mun.ca/cdm/ref/collection/theses3/id/196553 The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries Ultrasonic waves--Speed Text Electronic thesis or dissertation 2001 ftmemorialunivdc 2015-08-06T19:20:53Z Thesis (M.Sc.)--Memorial University of Newfoundland, 2001. Physics and Physical Oceanography Bibliography: leaves 77-78 A wave pulse can propagate with a negative group velocity when it travels through a medium with anomalous dispersion, that is, when the derivative of the dispersion curve is negative. Here we report on the experimental observation of negative group velocities for pulses of ultrasound propagating ballistically through water containing gas bubbles. For frequencies near the resonant frequency of the bubbles, the absorption increases strongly and the group velocity becomes negative. Our experimental results are in good agreement with a theoretical model sound propagation in bubbly liquids if we assume a Gaussian distribution of bubble sizes. Thesis Newfoundland studies University of Newfoundland Memorial University of Newfoundland: Digital Archives Initiative (DAI) |
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Memorial University of Newfoundland: Digital Archives Initiative (DAI) |
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ftmemorialunivdc |
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English |
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Ultrasonic waves--Speed |
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Ultrasonic waves--Speed Leary, Del M., 1971- Negative group velocity of ultrasonic pulses in a bubbly liquid |
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Ultrasonic waves--Speed |
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Thesis (M.Sc.)--Memorial University of Newfoundland, 2001. Physics and Physical Oceanography Bibliography: leaves 77-78 A wave pulse can propagate with a negative group velocity when it travels through a medium with anomalous dispersion, that is, when the derivative of the dispersion curve is negative. Here we report on the experimental observation of negative group velocities for pulses of ultrasound propagating ballistically through water containing gas bubbles. For frequencies near the resonant frequency of the bubbles, the absorption increases strongly and the group velocity becomes negative. Our experimental results are in good agreement with a theoretical model sound propagation in bubbly liquids if we assume a Gaussian distribution of bubble sizes. |
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Memorial University of Newfoundland. Dept. of Physics and Physical Oceanography |
format |
Thesis |
author |
Leary, Del M., 1971- |
author_facet |
Leary, Del M., 1971- |
author_sort |
Leary, Del M., 1971- |
title |
Negative group velocity of ultrasonic pulses in a bubbly liquid |
title_short |
Negative group velocity of ultrasonic pulses in a bubbly liquid |
title_full |
Negative group velocity of ultrasonic pulses in a bubbly liquid |
title_fullStr |
Negative group velocity of ultrasonic pulses in a bubbly liquid |
title_full_unstemmed |
Negative group velocity of ultrasonic pulses in a bubbly liquid |
title_sort |
negative group velocity of ultrasonic pulses in a bubbly liquid |
publishDate |
2001 |
url |
http://collections.mun.ca/cdm/ref/collection/theses3/id/196553 |
genre |
Newfoundland studies University of Newfoundland |
genre_facet |
Newfoundland studies University of Newfoundland |
op_source |
Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries |
op_relation |
Electronic Theses and Dissertations (7.88 MB) -- http://collections.mun.ca/PDFs/theses/Leary_DelM.pdf a1538879 http://collections.mun.ca/cdm/ref/collection/theses3/id/196553 |
op_rights |
The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. |
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