Mettin, Robert

[["dc.bibliographiccitation.firstpage","550"],["dc.bibliographiccitation.journal","Ultrasonics Sonochemistry"],["dc.bibliographiccitation.lastpage","562"],["dc.bibliographiccitation.volume","29"],["dc.contributor.author","Reuter, Fabian"],["dc.contributor.author","Mettin, Robert"],["dc.date.accessioned","2018-11-07T10:18:00Z"],["dc.date.available","2018-11-07T10:18:00Z"],["dc.date.issued","2016"],["dc.description.abstract","The dynamics of collapsing bubbles close to a flat solid is investigated with respect to its potential for removal of surface attached particles. Individual bubbles are created by nanosecond Nd:YAG laser pulses focused into water close to glass plates contaminated with melamine resin micro-particles. The bubble dynamics is analysed by means of synchronous high-speed recordings. Due to the close solid boundary, the bubble collapses with the well-known liquid jet phenomenon. Subsequent microscopic inspection of the substrates reveals circular areas clean of particles after a single bubble generation and collapse event. The detailed bubble dynamics, as well as the cleaned area size, is characterised by the non-dimensional bubble stand-off gamma = d/R-max, with d: laser focus distance to the solid boundary, and R-max: maximum bubble radius before collapse. We observe a maximum of clean area at gamma approximate to 0.7, a roughly linear decay of the cleaned circle radius for increasing gamma, and no cleaning for gamma > 3.5. As the main mechanism for particle removal, rapid flows at the boundary are identified. Three different cleaning regimes are discussed in relation to gamma: (I) For large stand-off, 1.8 < gamma < 3.5, bubble collapse induced vortex flows touch down onto the substrate and remove particles without significant contact of the gas phase. (II) For small distances, gamma < 1.1, the bubble is in direct contact with the solid. Fast liquid flows at the substrate are driven by the jet impact with its subsequent radial spreading, and by the liquid following the motion of the collapsing and rebounding bubble wall. Both flows remove particles. Their relative timing, which depends sensitively on the exact gamma, appears to determine the extension of the area with forces large enough to cause particle detachment. (III) At intermediate stand-off, 1.1 < gamma < 1.8, only the second bubble collapse touches the substrate, but acts with cleaning mechanisms similar to an effective small gamma collapse: particles are removed by the jet flow and the flow induced by the bubble wall oscillation. Furthermore, the observations reveal that the extent of direct bubble gas phase contact to the solid is partially smaller than the cleaned area, and it is concluded that three-phase contact line motion is not a major cause of particle removal. Finally, we find a relation of cleaning area vs. stand-off gamma that deviates from literature data on surface erosion. This indicates that different effects are responsible for particle removal and for substrate damage. It is suggested that a trade-off of cleaning potential and damage risk for sensible surfaces might be achieved by optimising gamma. (C) 2015 Elsevier B.V. All rights reserved."],["dc.identifier.doi","10.1016/j.ultsonch.2015.06.017"],["dc.identifier.isi","000366238000062"],["dc.identifier.pmid","26187759"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/41340"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Science Bv"],["dc.relation.issn","1873-2828"],["dc.relation.issn","1350-4177"],["dc.title","Mechanisms of single bubble cleaning"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","073123"],["dc.bibliographiccitation.issue","7"],["dc.bibliographiccitation.journal","Chaos: An Interdisciplinary Journal of Nonlinear Science"],["dc.bibliographiccitation.volume","30"],["dc.contributor.author","Hegedűs, F."],["dc.contributor.author","Krähling, P."],["dc.contributor.author","Aron, M."],["dc.contributor.author","Lauterborn, W."],["dc.contributor.author","Mettin, R."],["dc.contributor.author","Parlitz, U."],["dc.date.accessioned","2021-04-14T08:25:38Z"],["dc.date.available","2021-04-14T08:25:38Z"],["dc.date.issued","2020"],["dc.identifier.doi","10.1063/5.0005424"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/81694"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-399"],["dc.relation.eissn","1089-7682"],["dc.relation.issn","1054-1500"],["dc.title","Feedforward attractor targeting for non-linear oscillators using a dual-frequency driving technique"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","3649"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","The Journal of the Acoustical Society of America"],["dc.bibliographiccitation.lastpage","3659"],["dc.bibliographiccitation.volume","142"],["dc.contributor.author","Lechner, Christiane"],["dc.contributor.author","Koch, Max"],["dc.contributor.author","Lauterborn, Werner"],["dc.contributor.author","Mettin, Robert"],["dc.date.accessioned","2020-12-10T18:36:37Z"],["dc.date.available","2020-12-10T18:36:37Z"],["dc.date.issued","2017"],["dc.identifier.doi","10.1121/1.5017619"],["dc.identifier.issn","0001-4966"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/76687"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Pressure and tension waves from bubble collapse near a solid boundary: A numerical approach"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","174301"],["dc.bibliographiccitation.issue","17"],["dc.bibliographiccitation.journal","Physical Review Letters"],["dc.bibliographiccitation.volume","91"],["dc.contributor.author","Krefting, D."],["dc.contributor.author","Mettin, Robert"],["dc.contributor.author","Lauterborn, Werner"],["dc.date.accessioned","2018-11-07T10:35:26Z"],["dc.date.available","2018-11-07T10:35:26Z"],["dc.date.issued","2003"],["dc.description.abstract","Single bubble sonoluminescence (SBSL) is realized in air-saturated water at ambient pressure and room temperature. The behavior is similar to SBSL in degassed water, but with a higher spatial variability of the bubble position. A detailed view on the dynamics of the bubbles shows agreement between calculated shape stability borders but differs slightly in the equilibrium radii predicted by a mass diffusion model. A comparison with results in degassed water is done as well as a time resolved characterization of bubble oscillation, translation, and light emission for synchronous and recycling SBSL. The formation of streamer structures is observed in the same parameter range, when bubble nuclei are present. This may lead to a unified interpretation of SBSL and multibubble sonoluminescence."],["dc.identifier.doi","10.1103/PhysRevLett.91.174301"],["dc.identifier.isi","000186138300024"],["dc.identifier.pmid","14611352"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/45096"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","American Physical Soc"],["dc.relation.issn","0031-9007"],["dc.title","Single-bubble sonoluminescence in air-saturated water"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","39"],["dc.bibliographiccitation.journal","Ultrasonics Sonochemistry"],["dc.bibliographiccitation.lastpage","50"],["dc.bibliographiccitation.volume","48"],["dc.contributor.author","Kauer, Markus"],["dc.contributor.author","Belova-Magri, Valentina"],["dc.contributor.author","Cairós, Carlos"],["dc.contributor.author","Linka, Gerd"],["dc.contributor.author","Mettin, Robert"],["dc.date.accessioned","2020-12-10T15:21:40Z"],["dc.date.available","2020-12-10T15:21:40Z"],["dc.date.issued","2018"],["dc.identifier.doi","10.1016/j.ultsonch.2018.04.015"],["dc.identifier.issn","1350-4177"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/73111"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","High-speed imaging of ultrasound driven cavitation bubbles in blind and through holes"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","10029"],["dc.bibliographiccitation.issue","43"],["dc.bibliographiccitation.journal","Physical Chemistry Chemical Physics"],["dc.bibliographiccitation.lastpage","10034"],["dc.bibliographiccitation.volume","11"],["dc.contributor.author","Brotchie, Adam"],["dc.contributor.author","Mettin, Robert"],["dc.contributor.author","Grieser, Franz"],["dc.contributor.author","Ashokkumar, Muthupandian"],["dc.date.accessioned","2018-11-07T08:35:22Z"],["dc.date.available","2018-11-07T08:35:22Z"],["dc.date.issued","2009"],["dc.description.abstract","High-speed photographic observations of cavitation occurring under a low-frequency (21 kHz) sonotrode tip in the presence of an additional, high-frequency (355 kHz) ultrasound source have been made in water and in dilute aqueous solute solutions. Acoustic emission spectra were measured to support the visual observations. It was seen that a nucleating effect of the high-frequency action on cavitation at the low-frequency sonotrode was highly power dependent, with cavitation being homogenous at low acoustic power and highly localised at high acoustic power. The presence of solutes was found to significantly affect the cavitation structures and the bubble fragmentation process. Both the fundamental high-frequency acoustic emission peak and the higher order low- frequency harmonics were significantly intensified in the dual-frequency mode in the presence of these solutes. Additionally, the application of a high-voltage induced acoustic shock-wave to two different ultrasound fields was investigated in water and surfactant solutions."],["dc.identifier.doi","10.1039/b912725a"],["dc.identifier.isi","000271243400010"],["dc.identifier.pmid","19865755"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/18050"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Royal Soc Chemistry"],["dc.relation.issn","1463-9076"],["dc.title","Cavitation activation by dual-frequency ultrasound and shock waves"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1379"],["dc.bibliographiccitation.issue","10"],["dc.bibliographiccitation.journal","Chemie - Ingenieur - Technik"],["dc.bibliographiccitation.lastpage","1384"],["dc.bibliographiccitation.volume","89"],["dc.contributor.author","Lesnik, Sergey"],["dc.contributor.author","Mettin, Robert"],["dc.contributor.author","Brenner, Gunther"],["dc.date.accessioned","2020-12-10T14:05:56Z"],["dc.date.available","2020-12-10T14:05:56Z"],["dc.date.issued","2017"],["dc.identifier.doi","10.1002/cite.v89.10"],["dc.identifier.issn","0009-286X"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/69715"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Study of Ultrasound Propagation and Cavitation Activity in a Packing Bed of Spherical Particles"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1918"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","The Journal of the Acoustical Society of America"],["dc.bibliographiccitation.lastpage","1927"],["dc.bibliographiccitation.volume","112"],["dc.contributor.author","Krefting, D."],["dc.contributor.author","Mettin, Robert"],["dc.contributor.author","Lauterborn, Werner"],["dc.date.accessioned","2018-11-07T09:53:20Z"],["dc.date.available","2018-11-07T09:53:20Z"],["dc.date.issued","2002"],["dc.description.abstract","Sonoluminescing single bubbles driven simultaneously by two harmonic frequencies were recently reported to increase the maximum light output up to a factor of 3 with respect to single mode excitation. In this paper, experimental and numerical results on single-bubble sonoluminescence (SBSL) in an air/water system using the fundamental mode of 25 kHz and the second harmonic at 50 kHz are presented. The region of light emission is mapped in the three-dimensional parameter space spanned by the two driving pressure amplitudes and their relative phase. Good agreement was seen between measured light output, maximum bubble radius, and stability boundaries and the numerical model which is based on spherical bubble oscillations regarding diffusive and shape stability. The maximum brightness was enhanced by a factor up to 2.5 with respect to single mode SBSL. However, long-term measurements reveal great variation of the emission at fundamental mode driven SBSL and of the boost factor reached with two frequencies. The overall brightness maxima of both excitation methods within a period of several hours turn out to show little difference. (C) 2002 Acoustical Society of America."],["dc.identifier.doi","10.1121/1.1509427"],["dc.identifier.isi","000178870100017"],["dc.identifier.pmid","12430803"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/36312"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Acoustical Soc Amer Amer Inst Physics"],["dc.relation.issn","0001-4966"],["dc.title","Two-frequency driven single-bubble sonoluminescence"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","273"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Nonlinear Dynamics"],["dc.bibliographiccitation.lastpage","293"],["dc.bibliographiccitation.volume","94"],["dc.contributor.author","Hegedűs, Ferenc"],["dc.contributor.author","Lauterborn, Werner"],["dc.contributor.author","Parlitz, Ulrich"],["dc.contributor.author","Mettin, Robert"],["dc.date.accessioned","2020-12-10T14:11:45Z"],["dc.date.available","2020-12-10T14:11:45Z"],["dc.date.issued","2018"],["dc.identifier.doi","10.1007/s11071-018-4358-z"],["dc.identifier.eissn","1573-269X"],["dc.identifier.issn","0924-090X"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/15562"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/71189"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.notes.intern","Merged from goescholar"],["dc.relation.orgunit","Fakultät für Physik"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0/"],["dc.title","Non-feedback technique to directly control multistability in nonlinear oscillators by dual-frequency driving"],["dc.title.alternative","GPU accelerated topological analysis of a bubble in water"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","1250132"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","International Journal of Bifurcation and Chaos"],["dc.bibliographiccitation.volume","22"],["dc.contributor.author","Toebbens, Alexander"],["dc.contributor.author","Mettin, Robert"],["dc.contributor.author","Parlitz, Ulrich"],["dc.date.accessioned","2018-11-07T09:09:28Z"],["dc.date.available","2018-11-07T09:09:28Z"],["dc.date.issued","2012"],["dc.description.abstract","A mathematical model for a nonlinear oscillator, which is composed of an oscillating mass interacting with a freely sliding friction damper, is introduced and investigated. This oscillator is a strongly simplified model for a damping principle applied to turbine blades to suppress oscillations induced by inhomogeneous flow fields. It exhibits periodic, quasi-periodic, as well as chaotic dynamics occuring suddenly due to adding sliding bifurcations. Mathematically, the oscillator is given as a piecewise smooth (Filippov) system with a switching manifold corresponding to the sticking phase of the damper mass. The rich dynamics of this system is analyzed and illustrated by means of resonance curves, Lyapunov diagrams, Poincare sections and reductions to iterated one-dimensional maps."],["dc.identifier.doi","10.1142/S0218127412501325"],["dc.identifier.isi","000306505900009"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/26270"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","World Scientific Publ Co Pte Ltd"],["dc.relation.issn","1793-6551"],["dc.relation.issn","0218-1274"],["dc.title","DYNAMICS OF A DRIVEN OSCILLATOR CARRYING A FREELY SLIDING MASS"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]