Oscillations, Waves, and Interactions - GWDG

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138 D. Guicking [212] M. L. Post and T. C. Corle, ‘Separation Control Using Plasma Actuators: Dynamic Stall Vortex Control on Oscillating Airfoil’, AIAA J. 44, 3125–3135 (2006). [213] H. T. Ngo, ‘Tip Vortex Reduction System’, U.S. Patent US 5,791,875, filed: Sept. 10, 1996, patented: Aug. 11, 1998. [214] B.-H. Kim et al., ‘Modeling Pulsed-Blowing Systems for Flow Control’, AIAA J. 43, 314–325 (2005). [215] H. Preckel and D. Ronneberger, ‘Dynamic Control of the Jet-Edge-Flow’, in IUTAM Symposium on Mechanics of Passive and Active Flow Control, edited by G. E. A. Meier and P. R. Viswanath (Kluwer Academic Publishers, Dordrecht, NL, 1999), pp. 349– 354. [216] G. Wickern, ‘Windkanal’, German Patent Application DE 197 02 390 A1, filed: Jan. 24, 1997, published: July 30, 1998. [217] B. Lange and D. Ronneberger, ‘Control of Pipe Flow by Use of an Aeroacoustic Instability’, in IUTAM Symposium on Mechanics of Passive and Active Flow Control, edited by G. E. A. Meier and P. R. Viswanath (Kluwer Academic Publishers, Dordrecht, NL, 1999), pp. 305–310. [218] B. Lange and D. Ronneberger, ‘Active Noise Control by Use of an Aeroacoustic Instability’, Acta Acustica/Acustica 89, 658–665 (2003). [219] D. Guicking, ‘Active Noise and Vibration Control’, Annotated Reference Bibliography, 4th Edition on CD ROM (Jan. 2003), 8382 references with comfortable retrieval program GORBI (Guicking’s Online Reference Bibliography). More information at http://www.physik3.gwdg.de/∼guicking and http://www.guicking.de. [220] D. Guicking, ‘Patents on Active Control of Sound and Vibration – an Overview’, 2nd ed., 125-page brochure, and a comprehensive data file on CD ROM with comfortable retrieval program GOPI (Guicking’s Online Patent Information). More information at http://www.physik3.gwdg.de/∼guicking and http://www.guicking.de.
Oscillations, Waves and Interactions, pp. 139–170 edited by T. Kurz, U. Parlitz, and U. Kaatze Universitätsverlag Göttingen (2007) ISBN 978–3–938616–96–3 urn:nbn:de:gbv:7-verlag-1-06-7 The single bubble – a hot microlaboratory W. Lauterborn, T. Kurz, R. Geisler, D. Kröninger, and D. Schanz Drittes Physikalisches Institut, Georg-August-Universität Göttingen Friedrich-Hund-Platz 1, 37077 Göttingen, Germany Abstract. Experimental and numerical work on single bubbles in liquids, mostly water, is presented. The oscillation properties of acoustically driven bubbles from periodic motion to period-doubling and chaotic dynamics are reviewed. Optic cavitation as a means to prepare single bubble states in conjunction with high-speed optical observations is shown to enable detailed investigations of bubble dynamics, in particular, fast bubble collapse at various conditions. In this way, shock wave and light emission, jet and counter-jet formation near solid walls and the associated erosive action on the surface could be elucidated. Molecular dynamics studies are presented that allow a numerical view into the bubble interior that hitherto is not accessible by experiments. 1 Introduction A single bubble in a liquid is a remarkable object. In many cases it attains a spherical shape due to surface tension and floats around in the liquid driven by the various forces that it is susceptible to, notably pressure forces of all kinds from static to acoustic, from buoyancy to drag. A single bubble, in a sense, is an artificial object, as it likes to come in clouds and swarms. However, the single bubble is the building block and starting point for describing more complex bubble configurations. Moreover, through the concentrated effort of many a scientist it has been tamed to be kept in place in a bubble trap for closer inspection [1], similar to the optical tweezer for objects susceptible to electromagnetic forces (light waves) or the ion trap for keeping ions in place with electric forces. 2 Single bubble in a sound field It has been found that bubbles can be generated in liquids by sufficiently strong sound fields, a process called acoustic cavitation. The bubbles formed subsequently react to the pressure variations in the sound field. Sufficiently small bubbles attain a spherical shape due to the surface tension of the liquid and start to oscillate radially. Indeed, they can be considered as nonlinear oscillators driven by the varying pressure of the sound. When dispensing with other forces (as buoyancy, for instance) tractable models for the oscillation of a spherical bubble in a sound field can be formulated with varying degree of sophistication.
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Thomas Kurz, Ulrich Parlitz, and Ud
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erschienen im Universitätsverlag G
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Bibliographische Information der De
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iv Contents Laser speckle metrology
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Oscillations, Waves and Interaction
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Applied physics at the “Dritte”
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noise component [GNE] 5 4 3 2 1 can
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3.4 Transfer to running speech Spee
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Speech research 33 Area [Pixels] 60
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198 R. Mettin [52] R. Mettin, C.-D.
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260 K. D. Hinsch Generally, any of
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434 U. Parlitz [76] H. D. I. Abarba
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436 S. Lakämper and C. F. Schmidt
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462 Index basin of attraction, 144
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464 Index cone bubble structure, 19
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466 Index turbulent, 111, 126 fluct
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468 Index LPC, 29 luminescence of b
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470 Index peak factor, 38, 43 Peier
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472 Index laser-induced bubble, 152
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474 Index ultraharmonic resonance,
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