File:Acoustic properties of toroidal bubbles and construction of a large apparatus (IA acousticproperti109451675).pdf
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[edit]Acoustic properties of toroidal bubbles and construction of a large apparatus
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| Author |
Harris, Ashley M. |
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| Title |
Acoustic properties of toroidal bubbles and construction of a large apparatus |
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| Publisher |
Monterey, California. Naval Postgraduate School |
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| Description |
When a burst of air is produced in water, the result can be a toroidal bubble. This thesis is concerned with experimental investigations of three acoustical properties of toroidal bubbles: (i) propagation through high-intensity noise, (ii) emission, and (iii) scattering. In (i), an attempt to observe a recent prediction of the acoustic drag on a bubble is described, which is analogous to the Einstein-Hopf effect for an oscillating electric dipole in a fluctuating electromagnetic field. No effect was observed, which may be due to insufficient amplitude of the noise. In (ii), observations of acoustic emissions of volume oscillations of toroidal bubbles are reported. Surprisingly, the emission occurs primarily during the formation of a bubble, and is weak in the case of very smooth toroidal bubbles. In (iii), we describe an experiment to observe the effect of a toroidal bubble on an incident sound field. In addition to the acoustical investigations, we describe the construction of a large hallway apparatus for further investigations and for hands-on use by the public. The tank has cross section 2 feet by 2 feet and height 6 feet, and the parameters of reservoir pressure and time between air bursts are adjustable by the observer. Subjects: Acoustic emission; Vortex-motion; Electromagnetic fields; Bubbles; Toroidal bubble; Vortex ring |
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| Language | English | |
| Publication date | March 2004 | |
| Current location |
IA Collections: navalpostgraduateschoollibrary; fedlink |
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| Accession number |
acousticproperti109451675 |
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| Source | ||
| Permission (Reusing this file) |
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. As such, it is in the public domain, and under the provisions of Title 17, United States Code, Section 105, may not be copyrighted. | |
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| This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. | ||
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| current | 22:39, 13 July 2020 |  | 1,275 × 1,650, 78 pages (904 KB) | Fæ (talk | contribs) | FEDLINK - United States Federal Collection acousticproperti109451675 (User talk:Fæ/IA books#Fork8) (batch 1993-2020 #5352) |
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