{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/102451"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/102451","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"An experimental study on the collapse of an air-filled cylindrical cavity under dynamic loading","abstract":"A model system was designed and investigated experimentally to gain insight into the interactions of an air-filled cylindrical bubble immersed in hydrogel, a compliant boundary, and a transient loading wave. This combination is an analog of processes that occur in biomedical applications such as shockwave lithotripsy. No-boundary, rigid boundary, and two-boundary cases were also investigated. A transient pressure wave of 20~MPa peak magnitude generated by projectile impact was used to initiate bubble collapse. Ultra high-speed video recordings of the process showed the development of a re-entrant jet characteristic of asymmetric bubble collapse in the no-boundary case, but less frequent occurrence of this behavior in cases with boundaries. Void interface velocity in excess of 200~m/s was detected, which is sufficient to cause pressures in the hundreds of megapascals and possibly damage tissues. However, an alternative damage mechanism is also proposed based on the significant deformation of the upstream boundary during the collapse time. Flowfield data for all cases were acquired by a particle image velocimetry technique to elucidate the causes of boundary deformation, the suppression of jet formation, and the extreme velocities on the upstream void interface. An analytical model for the flow was developed to describe these flowfields, incorporating three components: the free-stream flow, a source flow, and a doublet flow. Parameters of the model were determined by fitting to data. The model represented the data to within 5~m/s on average---this was approximately equal to the 1-pixel PIV system noise threshold, and 5\\% of the maximum flowfield velocity. The variation of model parameters over the course of the collapse was investigated to give the model predictive as well as descriptive value. The source strength agreed well with predictions based on symmetrical collapse relations. The doublet strength was consistent with the generation of vorticity on the bubble boundary due to interaction with a weak shock.","abstract_html":"A model system was designed and investigated experimentally to gain insight into the interactions of an air-filled cylindrical bubble immersed in hydrogel, a compliant boundary, and a transient loading wave. This combination is an analog of processes that occur in biomedical applications such as shockwave lithotripsy. No-boundary, rigid boundary, and two-boundary cases were also investigated. A transient pressure wave of 20~MPa peak magnitude generated by projectile impact was used to initiate bubble collapse. Ultra high-speed video recordings of the process showed the development of a re-entrant jet characteristic of asymmetric bubble collapse in the no-boundary case, but less frequent occurrence of this behavior in cases with boundaries. Void interface velocity in excess of 200~m/s was detected, which is sufficient to cause pressures in the hundreds of megapascals and possibly damage tissues. However, an alternative damage mechanism is also proposed based on the significant deformation of the upstream boundary during the collapse time. Flowfield data for all cases were acquired by a particle image velocimetry technique to elucidate the causes of boundary deformation, the suppression of jet formation, and the extreme velocities on the upstream void interface. An analytical model for the flow was developed to describe these flowfields, incorporating three components: the free-stream flow, a source flow, and a doublet flow. Parameters of the model were determined by fitting to data. The model represented the data to within 5~m/s on average---this was approximately equal to the 1-pixel PIV system noise threshold, and 5\\% of the maximum flowfield velocity. The variation of model parameters over the course of the collapse was investigated to give the model predictive as well as descriptive value. The source strength agreed well with predictions based on symmetrical collapse relations. The doublet strength was consistent with the generation of vorticity on the bubble boundary due to interaction with a weak shock.","abstract_has_math":false,"creators":["Shpuntova, Galina V"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Aerospace Engineering","degree_department":null,"school":null,"contributors":["Dutton, J. Craig","Shepherd, Joseph E","Bodony, Daniel J.","Lambros, John"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2019,"date_issued":"2019-02-06T19:36:21Z","date_published":"2019-02-06T19:36:21Z","updated_at":"2026-07-22T22:24:40Z","subjects":["Fluid mechanics","Multiphase","Bubbles","Bubble collapse","Cavitation","Wave-bubble interaction","Shadowgraph","Particle Image Velocimetry (PIV)"],"languages":["en"],"rights":["Copyright Galina V Shpuntova 2018"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/102451","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Dutton, J. 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This combination is an analog of processes that occur in biomedical applications such as shockwave lithotripsy. No-boundary, rigid boundary, and two-boundary cases were also investigated. A transient pressure wave of 20~MPa peak magnitude generated by projectile impact was used to initiate bubble collapse. Ultra high-speed video recordings of the process showed the development of a re-entrant jet characteristic of asymmetric bubble collapse in the no-boundary case, but less frequent occurrence of this behavior in cases with boundaries. Void interface velocity in excess of 200~m/s was detected, which is sufficient to cause pressures in the hundreds of megapascals and possibly damage tissues. However, an alternative damage mechanism is also proposed based on the significant deformation of the upstream boundary during the collapse time. Flowfield data for all cases were acquired by a particle image velocimetry technique to elucidate the causes of boundary deformation, the suppression of jet formation, and the extreme velocities on the upstream void interface. An analytical model for the flow was developed to describe these flowfields, incorporating three components: the free-stream flow, a source flow, and a doublet flow. Parameters of the model were determined by fitting to data. The model represented the data to within 5~m/s on average---this was approximately equal to the 1-pixel PIV system noise threshold, and 5\\% of the maximum flowfield velocity. The variation of model parameters over the course of the collapse was investigated to give the model predictive as well as descriptive value. The source strength agreed well with predictions based on symmetrical collapse relations. The doublet strength was consistent with the generation of vorticity on the bubble boundary due to interaction with a weak shock.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2019-02-05 without embargo terms","The student, Galina Shpuntova, accepted the attached license on 2018-11-29 at 04:13.","The student, Galina Shpuntova, submitted this Dissertation for approval on 2018-11-29 at 05:01.","This Dissertation was approved for publication on 2018-12-04 at 10:37.","DSpace SAF Submission Ingestion Package generated from Vireo submission #13142 on 2019-02-05 at 11:10:01","Made available in DSpace on 2019-02-06T19:36:21Z (GMT). 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Void interface velocity in excess of 200~m/s was detected, which is sufficient to cause pressures in the hundreds of megapascals and possibly damage tissues. However, an alternative damage mechanism is also proposed based on the significant deformation of the upstream boundary during the collapse time. Flowfield data for all cases were acquired by a particle image velocimetry technique to elucidate the causes of boundary deformation, the suppression of jet formation, and the extreme velocities on the upstream void interface. An analytical model for the flow was developed to describe these flowfields, incorporating three components: the free-stream flow, a source flow, and a doublet flow. Parameters of the model were determined by fitting to data. The model represented the data to within 5~m/s on average---this was approximately equal to the 1-pixel PIV system noise threshold, and 5\\% of the maximum flowfield velocity. The variation of model parameters over the course of the collapse was investigated to give the model predictive as well as descriptive value. The source strength agreed well with predictions based on symmetrical collapse relations. The doublet strength was consistent with the generation of vorticity on the bubble boundary due to interaction with a weak shock.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2019-02-05 without embargo terms","The student, Galina Shpuntova, accepted the attached license on 2018-11-29 at 04:13.","The student, Galina Shpuntova, submitted this Dissertation for approval on 2018-11-29 at 05:01.","This Dissertation was approved for publication on 2018-12-04 at 10:37.","DSpace SAF Submission Ingestion Package generated from Vireo submission #13142 on 2019-02-05 at 11:10:01","Made available in DSpace on 2019-02-06T19:36:21Z (GMT). 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