Experimental characterisation of light emission during shock-driven cavity collapse
The authors describe experimental work examining the collapse of a cavity by a strong shockwave. A millimetre size cavity is cast in Phytagel, which is then impacted by a metallic projectile accelerated by a compressed gas gun, reaching velocities up to 500 m/s. The impact generates a strong shockwa...
| Main Authors: | , , , , , |
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| Format: | Conference item |
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Acoustical Society of America
2013
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| _version_ | 1797092947250905088 |
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| author | Anderson, P Hawker, N Betney, M Tully, B Ventikos, Y Roy, R |
| author_facet | Anderson, P Hawker, N Betney, M Tully, B Ventikos, Y Roy, R |
| author_sort | Anderson, P |
| collection | OXFORD |
| description | The authors describe experimental work examining the collapse of a cavity by a strong shockwave. A millimetre size cavity is cast in Phytagel, which is then impacted by a metallic projectile accelerated by a compressed gas gun, reaching velocities up to 500 m/s. The impact generates a strong shockwave that propagates into the gel at greater than sonic velocity. Schlieren images are presented that illustrate both this process and the subsequent cavity collapse at a sub-microsecond timescale. As the shockwave reaches the cavity it is shown to cause a rapid asymmetric collapse process characterised by the formation of a high-speed transverse jet. The pressure of the shockwave is found to be 100+ MPa as measured via a custom-built fibre-optic probe hydrophone. Previous work examining shock-driven cavity collapse observed luminescence, postulated to be due to the high-speed impact of the transverse jet on the far bubble wall; this experimental observation is replicated. Further, the light emission is characterised as a function of impact velocity and thus of shockwave pressure. This reveals that shock-driven cavity collapse shares many of the unique features that make the more widely studied SBSL-type collapse interesting. |
| first_indexed | 2024-03-07T03:53:17Z |
| format | Conference item |
| id | oxford-uuid:c20179ff-d2a3-4194-b90a-f6737b40f947 |
| institution | University of Oxford |
| last_indexed | 2024-03-07T03:53:17Z |
| publishDate | 2013 |
| publisher | Acoustical Society of America |
| record_format | dspace |
| spelling | oxford-uuid:c20179ff-d2a3-4194-b90a-f6737b40f9472022-03-27T06:05:50ZExperimental characterisation of light emission during shock-driven cavity collapseConference itemhttp://purl.org/coar/resource_type/c_5794uuid:c20179ff-d2a3-4194-b90a-f6737b40f947Symplectic Elements at OxfordAcoustical Society of America2013Anderson, PHawker, NBetney, MTully, BVentikos, YRoy, RThe authors describe experimental work examining the collapse of a cavity by a strong shockwave. A millimetre size cavity is cast in Phytagel, which is then impacted by a metallic projectile accelerated by a compressed gas gun, reaching velocities up to 500 m/s. The impact generates a strong shockwave that propagates into the gel at greater than sonic velocity. Schlieren images are presented that illustrate both this process and the subsequent cavity collapse at a sub-microsecond timescale. As the shockwave reaches the cavity it is shown to cause a rapid asymmetric collapse process characterised by the formation of a high-speed transverse jet. The pressure of the shockwave is found to be 100+ MPa as measured via a custom-built fibre-optic probe hydrophone. Previous work examining shock-driven cavity collapse observed luminescence, postulated to be due to the high-speed impact of the transverse jet on the far bubble wall; this experimental observation is replicated. Further, the light emission is characterised as a function of impact velocity and thus of shockwave pressure. This reveals that shock-driven cavity collapse shares many of the unique features that make the more widely studied SBSL-type collapse interesting. |
| spellingShingle | Anderson, P Hawker, N Betney, M Tully, B Ventikos, Y Roy, R Experimental characterisation of light emission during shock-driven cavity collapse |
| title | Experimental characterisation of light emission during shock-driven cavity collapse |
| title_full | Experimental characterisation of light emission during shock-driven cavity collapse |
| title_fullStr | Experimental characterisation of light emission during shock-driven cavity collapse |
| title_full_unstemmed | Experimental characterisation of light emission during shock-driven cavity collapse |
| title_short | Experimental characterisation of light emission during shock-driven cavity collapse |
| title_sort | experimental characterisation of light emission during shock driven cavity collapse |
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