Kurz, Thomas

[["dc.bibliographiccitation.artnumber","106501"],["dc.bibliographiccitation.issue","10"],["dc.bibliographiccitation.journal","Reports on Progress in Physics"],["dc.bibliographiccitation.volume","73"],["dc.contributor.author","Lauterborn, Werner"],["dc.contributor.author","Kurz, Thomas"],["dc.date.accessioned","2018-11-07T08:38:57Z"],["dc.date.available","2018-11-07T08:38:57Z"],["dc.date.issued","2010"],["dc.description.abstract","Bubbles in liquids, soft and squeezy objects made of gas and vapour, yet so strong as to destroy any material and so mysterious as at times turning into tiny light bulbs, are the topic of the present report. Bubbles respond to pressure forces and reveal their full potential when periodically driven by sound waves. The basic equations for nonlinear bubble oscillation in sound fields are given, together with a survey of typical solutions. A bubble in a liquid can be considered as a representative example from nonlinear dynamical systems theory with its resonances, multiple attractors with their basins, bifurcations to chaos and not yet fully describable behaviour due to infinite complexity. Three stability conditions are treated for stable trapping of bubbles in standing sound fields: positional, spherical and diffusional stability. Chemical reactions may become important in that respect, when reacting gases fill the bubble, but the chemistry of bubbles is just touched upon and is beyond the scope of the present report. Bubble collapse, the runaway shrinking of a bubble, is presented in its current state of knowledge. Pressures and temperatures that are reached at this occasion are discussed, as well as the light emission in the form of short flashes. Aspherical bubble collapse, as for instance enforced by boundaries nearby, mitigates most of the phenomena encountered in spherical collapse, but introduces a new effect: jet formation, the self-piercing of a bubble with a high velocity liquid jet. Examples of this phenomenon are given from light induced bubbles. Two oscillating bubbles attract or repel each other, depending on their oscillations and their distance. Upon approaching, attraction may change to repulsion and vice versa. When being close, they also shoot self-piercing jets at each other. Systems of bubbles are treated as they appear after shock wave passage through a liquid and with their branched filaments that they attain in standing sound fields. The N-bubble problem is formulated in the spirit of the n-body problem of astrophysics, but with more complicated interaction forces. Simulations are compared with three-dimensional bubble dynamics obtained by stereoscopic high speed digital videography."],["dc.identifier.doi","10.1088/0034-4885/73/10/106501"],["dc.identifier.isi","000282093900003"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/18876"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Iop Publishing Ltd"],["dc.relation.issn","1361-6633"],["dc.relation.issn","0034-4885"],["dc.title","Physics of bubble oscillations"],["dc.type","review"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","2916"],["dc.bibliographiccitation.issue","10"],["dc.bibliographiccitation.journal","Physics of Fluids"],["dc.bibliographiccitation.lastpage","2922"],["dc.bibliographiccitation.volume","15"],["dc.contributor.author","Wolfrum, B."],["dc.contributor.author","Kurz, Thomas"],["dc.contributor.author","Mettin, Robert"],["dc.contributor.author","Lauterborn, Werner"],["dc.date.accessioned","2018-11-07T10:35:58Z"],["dc.date.available","2018-11-07T10:35:58Z"],["dc.date.issued","2003"],["dc.description.abstract","In the present study we experimentally investigate bubble dynamics after laser induced shock wave exposure in the vicinity of salt crystals suspended in water. High-speed microscopic images show aspherical collapse and rebound of single and multiple bubbles with initial radii between 5 and 150 mum. Radius time curves of bubbles close to one boundary are compared to the bubble dynamics of a spherical model. The bubble dynamics strongly depends on the position of neighboring bubbles and on the number of boundaries given by the surrounding salt grains. After excitation bubbles are drawn to the closest particles in their vicinity. Subsequent application of shock waves leads to jet formation against the rigid boundaries. The bubbles often tend to form in or migrate into cracks on the crystal surfaces and sometimes lead to the breakage of particles due to rapid bubble dynamics. Similar behavior may occur in other cases where material damage is induced by shock waves in liquids such as lithotripsy or shock wave cleaning applications. (C) 2003 American Institute of Physics."],["dc.identifier.doi","10.1063/1.1608938"],["dc.identifier.isi","000185268200013"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/45216"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Amer Inst Physics"],["dc.relation.issn","1070-6631"],["dc.title","Shock wave induced interaction of microbubbles and boundaries"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","PII S0894-1777(02)00182-6"],["dc.bibliographiccitation.firstpage","731"],["dc.bibliographiccitation.issue","6-7"],["dc.bibliographiccitation.journal","Experimental Thermal and Fluid Science"],["dc.bibliographiccitation.lastpage","737"],["dc.bibliographiccitation.volume","26"],["dc.contributor.author","Akhatov, I."],["dc.contributor.author","Vakhitova, N."],["dc.contributor.author","Topolnikov, A."],["dc.contributor.author","Zakirov, K."],["dc.contributor.author","Wolfrum, B."],["dc.contributor.author","Kurz, Thomas"],["dc.contributor.author","Lindau, O."],["dc.contributor.author","Mettin, Robert"],["dc.contributor.author","Lauterborn, Werner"],["dc.date.accessioned","2018-11-07T10:14:38Z"],["dc.date.available","2018-11-07T10:14:38Z"],["dc.date.issued","2002"],["dc.description.abstract","Single cavitation bubble luminescence induced by laser in contrast to single bubble sonoluminescence has no need in a sound field for a strong collapse and for light emission, The cavitation bubbles are produced by focused laser light and make the single strong collapse. As shown experimentally. the number of emitted photons from cavitatior luminescence is much greater than it was observed in sonoluminescence due to the large bubble size during the final stage of co lapse. To describe the process of laser-induced bubble collapse a mathematical model is used, which is based upon the spherically symmetric motion including compressibility, heat and mass transfer effects. The basic results of the numerical solution are presented for the bubbles with maximum radii of about I mm. According to the observed results the minimum bubble radius in collapse is about 15 mum, and the mass decreases up to 5% of the initial value. Calculations with a small amounts or noncondensable gas inside the bubble predict its strong influence on the dynamics. As shown numerically the theoretical model gives a good agreement with experimental measurements. (C) 2002 Elsevier Science Inc. All rights reserved."],["dc.identifier.doi","10.1016/S0894-1777(02)00182-6"],["dc.identifier.isi","000178284700017"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/40657"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Science Inc"],["dc.publisher.place","New york"],["dc.relation.conference","4th International Congress on Multiphase Flow"],["dc.relation.eventlocation","TULANE UNIV, NEW ORLEANS, LA"],["dc.relation.issn","0894-1777"],["dc.title","Dynamics of laser-induced cavitation bubbles"],["dc.type","conference_paper"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","484"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Ultrasonics Sonochemistry"],["dc.bibliographiccitation.lastpage","491"],["dc.bibliographiccitation.volume","14"],["dc.contributor.author","Lauterborn, Werner"],["dc.contributor.author","Kurz, Thomas"],["dc.contributor.author","Geisler, Reinhard"],["dc.contributor.author","Schanz, Daniel"],["dc.contributor.author","Lindau, O."],["dc.date.accessioned","2018-11-07T11:03:58Z"],["dc.date.available","2018-11-07T11:03:58Z"],["dc.date.issued","2007"],["dc.description.abstract","Basic facts on the dynamics of bubbles in water are presented. Measurements on the free and forced radial oscillations of single spherical bubbles and their acoustic (shock waves) and optic (luminescence) emissions are given in photographic series and diagrams. Bubble cloud patterns and their dynamics and light emission in standing acoustic fields are discussed. (c) 2006 Elsevier B.V. All rights reserved."],["dc.identifier.doi","10.1016/j.ultsonch.2006.09.017"],["dc.identifier.isi","000245565900012"],["dc.identifier.pmid","17254826"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/51731"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Science Bv"],["dc.publisher.place","Amsterdam"],["dc.relation.conference","10th Meeting of the European-Society-of-Sonochemistry"],["dc.relation.eventlocation","Hamburg, GERMANY"],["dc.relation.issn","1350-4177"],["dc.title","Acoustic cavitation, bubble dynamics and sonoluminescence"],["dc.type","conference_paper"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","066307"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","PHYSICAL REVIEW E"],["dc.bibliographiccitation.volume","74"],["dc.contributor.author","Kurz, Thomas"],["dc.contributor.author","Kroeninger, Dennis"],["dc.contributor.author","Geisler, Reinhard"],["dc.contributor.author","Lauterborn, Werner"],["dc.date.accessioned","2018-11-07T08:55:40Z"],["dc.date.available","2018-11-07T08:55:40Z"],["dc.date.issued","2006"],["dc.description.abstract","Cavitation bubbles are generated in water by low-energy femtosecond laser pulses in the presence of an ultrasonic field. Bubble dynamics and cavitation luminescence are investigated by CCD photography and photomultiplier measurements in dependence on the phase of the acoustic cycle at which the bubbles are generated. The experimental results demonstrate that the initially small laser-generated bubbles can be expanded significantly by the sound field and that weak cavitation luminescence can be observed in two small intervals of the seeding phase. The luminescence yield sensitively depends on the degree of sphericity of bubble collapse."],["dc.identifier.doi","10.1103/PhysRevE.74.066307"],["dc.identifier.isi","000243165900039"],["dc.identifier.pmid","17280148"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/22958"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","American Physical Soc"],["dc.relation.issn","1539-3755"],["dc.title","Optic cavitation in an ultrasonic field"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","042406"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","PHYSICAL REVIEW E"],["dc.bibliographiccitation.volume","88"],["dc.contributor.author","Ishiyama, Tatsuya"],["dc.contributor.author","Fujikawa, Shigeo"],["dc.contributor.author","Kurz, Thomas"],["dc.contributor.author","Lauterborn, Werner"],["dc.date.accessioned","2018-11-07T09:18:37Z"],["dc.date.available","2018-11-07T09:18:37Z"],["dc.date.issued","2013"],["dc.description.abstract","A boundary condition for the Boltzmann equation (kinetic boundary condition, KBC) at the vapor-liquid interface of argon is constructed with the help of molecular dynamics (MD) simulations. The KBC is examined at a constant liquid temperature of 85 K in a wide range of nonequilibrium states of vapor. The present investigation is an extension of a previous one by Ishiyama, Yano, and Fujikawa [Phys. Rev. Lett. 95, 084504 (2005)] and provides a more complete form of the KBC. The present KBC includes a thermal accommodation coefficient in addition to evaporation and condensation coefficients, and these coefficients are determined in MD simulations uniquely. The thermal accommodation coefficient shows an anisotropic behavior at the interface for molecular velocities normal versus tangential to the interface. It is also found that the evaporation and condensation coefficients are almost constant in a fairly wide range of nonequilibrium states. The thermal accommodation coefficient of the normal velocity component is almost unity, while that of the tangential component shows a decreasing function of the density of vapor incident on the interface, indicating that the tangential velocity distribution of molecules leaving the interface into the vapor phase may deviate from the tangential parts of the Maxwell velocity distribution at the liquid temperature. A mechanism for the deviation of the KBC from the isotropic Maxwell KBC at the liquid temperature is discussed in terms of anisotropic energy relaxation at the interface. The liquid-temperature dependence of the present KBC is also discussed."],["dc.identifier.doi","10.1103/PhysRevE.88.042406"],["dc.identifier.isi","000326048400002"],["dc.identifier.pmid","24229188"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/28444"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Amer Physical Soc"],["dc.relation.issn","1550-2376"],["dc.relation.issn","1539-3755"],["dc.title","Nonequilibrium kinetic boundary condition at the vapor-liquid interface of argon"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","113019"],["dc.bibliographiccitation.journal","New Journal of Physics"],["dc.bibliographiccitation.volume","14"],["dc.contributor.author","Schanz, Daniel"],["dc.contributor.author","Metten, Burkhard"],["dc.contributor.author","Kurz, Thomas"],["dc.contributor.author","Lauterborn, Werner"],["dc.date.accessioned","2018-11-07T09:03:30Z"],["dc.date.available","2018-11-07T09:03:30Z"],["dc.date.issued","2012"],["dc.description.abstract","The dynamics of the medium within a collapsing and rebounding cavitation bubble is investigated by means of molecular dynamics (MD) simulations adopting a hard sphere model for the species inside the bubble. The dynamics of the surrounding liquid (water) is modelled using a Rayleigh-Plesset (RP)-type equation coupled to the bubble interior by the gas pressure at the wall obtained from the MD calculations. Water vapour and vapour chemistry are included in the RP-MD model as well as mass and energy transfer through the bubble wall. The calculations reveal the evolution of temperature, density and pressure within a bubble at conditions typical of single-bubble sonoluminescence and predict how the particle numbers and densities of different vapour dissociation and reaction products in the bubble develop in space and time. Among the parameters varied are the sound pressure amplitude of a sonoluminescence bubble in water, the noble gas mixture in the bubble and the accommodation coefficients for mass and energy exchange through the bubble wall. Simulation particle numbers up to 10 million are used; most calculations, however, are performed with one million particles to save computer run time. Validation of the MD code was done by comparing MD results with solutions obtained by continuum mechanics calculations for the Euler equations."],["dc.description.sponsorship","Open-Access-Publikationsfonds 2012"],["dc.identifier.doi","10.1088/1367-2630/14/11/113019"],["dc.identifier.isi","000311094500003"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/8491"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/24910"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Iop Publishing Ltd"],["dc.relation.issn","1367-2630"],["dc.relation.orgunit","Fakultät für Physik"],["dc.title","Molecular dynamics simulations of cavitation bubble collapse and sonoluminescence"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","395"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Experiments in Fluids"],["dc.bibliographiccitation.lastpage","408"],["dc.bibliographiccitation.volume","48"],["dc.contributor.author","Kroeninger, Dennis"],["dc.contributor.author","Koehler, Karsten"],["dc.contributor.author","Kurz, Thomas"],["dc.contributor.author","Lauterborn, Werner"],["dc.date.accessioned","2018-11-07T08:45:27Z"],["dc.date.available","2018-11-07T08:45:27Z"],["dc.date.issued","2010"],["dc.description.abstract","The velocity field in the vicinity of a laser-generated cavitation bubble in water is investigated by means of particle tracking velocimetry (PTV). Two situations are explored: a bubble collapsing spherically and a bubble collapsing aspherically near a rigid wall. In the first case, the accuracy of the PTV method is assessed by comparing the experimental data with the flow field around the bubble as obtained from numerical simulations of the radial bubble dynamics. The numerical results are matched to the experimental radius-time curve extracted from high-speed photographs by tuning the model parameters. Trajectories of tracer particles are calculated and used to model the experimental process of the PTV measurement. For the second case of a bubble collapsing near a rigid wall, both the bubble shape and the velocity distribution in the fluid around the bubble are measured for different standoff parameters gamma at several instants in time. The results for gamma > 1 are compared with the corresponding results of a boundary-integral simulation. For both cases, good agreement between simulation and experiment is found."],["dc.description.sponsorship","DFG-CNRS"],["dc.identifier.doi","10.1007/s00348-009-0743-1"],["dc.identifier.isi","000275460400002"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?goescholar/4172"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/20442"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","1432-1114"],["dc.relation.issn","0723-4864"],["dc.relation.orgunit","Fakultät für Physik"],["dc.rights","Goescholar"],["dc.rights.access","openAccess"],["dc.rights.uri","https://goedoc.uni-goettingen.de/licenses"],["dc.subject.ddc","530"],["dc.title","Particle tracking velocimetry of the flow field around a collapsing cavitation bubble"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","435"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","EUROPHYSICS LETTERS"],["dc.bibliographiccitation.lastpage","440"],["dc.bibliographiccitation.volume","66"],["dc.contributor.author","Geisler, Reinhard"],["dc.contributor.author","Schmidt-Ott, W. D."],["dc.contributor.author","Kurz, Thomas"],["dc.contributor.author","Lauterborn, Werner"],["dc.date.accessioned","2018-11-07T10:49:15Z"],["dc.date.available","2018-11-07T10:49:15Z"],["dc.date.issued","2004"],["dc.description.abstract","Laser-induced cavitation bubbles in heavy water are investigated at different parameter settings. Neutrons are searched for in close temporal proximity to cavitation luminescence flashes with an estimated detection efficiency of 4%. No neutrons in coincidence with cavitation luminescence have been detected. This yields an upper limit of emitted neutrons per bubble collapse of 5 x 10(-4)."],["dc.identifier.doi","10.1209/epl/i2003-10214-0"],["dc.identifier.isi","000223064700021"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/48382"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Edp Sciences S A"],["dc.relation.issn","0295-5075"],["dc.title","Search for neutron emission in laser-induced cavitation"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","3370"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","The Journal of the Acoustical Society of America"],["dc.bibliographiccitation.lastpage","3378"],["dc.bibliographiccitation.volume","130"],["dc.contributor.author","Koch, P."],["dc.contributor.author","Kurz, Thomas"],["dc.contributor.author","Parlitz, Ulrich"],["dc.contributor.author","Lauterborn, Werner"],["dc.date.accessioned","2018-11-07T08:50:06Z"],["dc.date.available","2018-11-07T08:50:06Z"],["dc.date.issued","2011"],["dc.description.abstract","Bubble dynamics is investigated numerically with special emphasis on the static pressure and the positional stability of the bubble in a standing sound field. The bubble habitat, made up of not dissolving, positionally and spherically stable bubbles, is calculated in the parameter space of the bubble radius at rest and sound pressure amplitude for different sound field frequencies, static pressures, and gas concentrations of the liquid. The bubble habitat grows with static pressure and shrinks with sound field frequency. The range of diffusionally stable bubble oscillations, found at positive slopes of the habitat-diffusion border, can be increased substantially with static pressure. (C) 2011 Acoustical Society of America. [DOI: 10.1121/1.3626159]"],["dc.identifier.doi","10.1121/1.3626159"],["dc.identifier.isi","000297486600020"],["dc.identifier.pmid","22088010"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/21618"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Acoustical Soc Amer Amer Inst Physics"],["dc.relation.issn","0001-4966"],["dc.title","Bubble dynamics in a standing sound field: The bubble habitat"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]