Droplet impacts onto soft solids entrap more air
We investigate the effects of surface stiffness on the air cushioning at the bottom of a liquid drop impacting onto a soft solid and the resulting entrapment of a central bubble. This was achieved using ultra-high-speed interferometry at 5 million frames per second and spatial resolution of 1.05 μm...
| Hlavní autoři: | , , |
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| Médium: | Journal article |
| Jazyk: | English |
| Vydáno: |
Royal Society of Chemistry
2020
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| _version_ | 1826294991864987648 |
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| author | Langley, KR Castrejon Pita, A Thoroddsen, ST |
| author_facet | Langley, KR Castrejon Pita, A Thoroddsen, ST |
| author_sort | Langley, KR |
| collection | OXFORD |
| description | We investigate the effects of surface stiffness on the air cushioning at the bottom of a liquid drop impacting onto a soft solid and the resulting entrapment of a central bubble. This was achieved using ultra-high-speed interferometry at 5 million frames per second and spatial resolution of 1.05 μm per pixel. The soft solid delays the effects of gas compressibility resulting in much larger air discs than corresponding impacts onto rigid surfaces. Using an effective impact velocity equal to half of the actual impact velocity brings the soft solid scaling behavior better in line with rigid substrate scaling. We also observe extended gliding of the drop as it initially avoids contact with the surface spreading over a thin layer of air and investigate the threshold velocity for the transition from gliding to ring contact. Such extended gliding layers have previously been seen for high-viscosity drop impacts, but not for low-viscosity liquids at the impact velocities used herein. |
| first_indexed | 2024-03-07T03:54:14Z |
| format | Journal article |
| id | oxford-uuid:c24e773c-e22b-439d-a4a1-33836355fab0 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T03:54:14Z |
| publishDate | 2020 |
| publisher | Royal Society of Chemistry |
| record_format | dspace |
| spelling | oxford-uuid:c24e773c-e22b-439d-a4a1-33836355fab02022-03-27T06:08:05ZDroplet impacts onto soft solids entrap more airJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:c24e773c-e22b-439d-a4a1-33836355fab0EnglishSymplectic ElementsRoyal Society of Chemistry2020Langley, KRCastrejon Pita, AThoroddsen, STWe investigate the effects of surface stiffness on the air cushioning at the bottom of a liquid drop impacting onto a soft solid and the resulting entrapment of a central bubble. This was achieved using ultra-high-speed interferometry at 5 million frames per second and spatial resolution of 1.05 μm per pixel. The soft solid delays the effects of gas compressibility resulting in much larger air discs than corresponding impacts onto rigid surfaces. Using an effective impact velocity equal to half of the actual impact velocity brings the soft solid scaling behavior better in line with rigid substrate scaling. We also observe extended gliding of the drop as it initially avoids contact with the surface spreading over a thin layer of air and investigate the threshold velocity for the transition from gliding to ring contact. Such extended gliding layers have previously been seen for high-viscosity drop impacts, but not for low-viscosity liquids at the impact velocities used herein. |
| spellingShingle | Langley, KR Castrejon Pita, A Thoroddsen, ST Droplet impacts onto soft solids entrap more air |
| title | Droplet impacts onto soft solids entrap more air |
| title_full | Droplet impacts onto soft solids entrap more air |
| title_fullStr | Droplet impacts onto soft solids entrap more air |
| title_full_unstemmed | Droplet impacts onto soft solids entrap more air |
| title_short | Droplet impacts onto soft solids entrap more air |
| title_sort | droplet impacts onto soft solids entrap more air |
| work_keys_str_mv | AT langleykr dropletimpactsontosoftsolidsentrapmoreair AT castrejonpitaa dropletimpactsontosoftsolidsentrapmoreair AT thoroddsenst dropletimpactsontosoftsolidsentrapmoreair |