It's harder to splash on soft solids
Droplets splash when they impact dry, flat substrates above a critical velocity that depends on parameters such as droplet size, viscosity and air pressure. By imaging ethanol drops impacting silicone gels of different stiffnesses we show that substrate stiffness also affects the splashing threshold...
| Hlavní autoři: | , , , , , , |
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| Médium: | Journal article |
| Vydáno: |
American Physical Society
2016
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| _version_ | 1826262099909672960 |
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| author | Howland, C Antkowiak, A Castrejón-Pita, J Howison, S Oliver, J Style, R Castrejón-Pita, A |
| author_facet | Howland, C Antkowiak, A Castrejón-Pita, J Howison, S Oliver, J Style, R Castrejón-Pita, A |
| author_sort | Howland, C |
| collection | OXFORD |
| description | Droplets splash when they impact dry, flat substrates above a critical velocity that depends on parameters such as droplet size, viscosity and air pressure. By imaging ethanol drops impacting silicone gels of different stiffnesses we show that substrate stiffness also affects the splashing threshold. Splashing is reduced or even eliminated: droplets on the softest substrates need over 70\% more kinetic energy to splash than they do on rigid substrates. We show that this is due to energy losses caused by deformations of soft substrates during the first few microseconds of impact. We find that solids with Young's moduli \lesssim 100kPa reduce splashing, in agreement with simple scaling arguments. Thus materials like soft gels and elastomers can be used as simple coatings for effective splash prevention. Soft substrates also serve as a useful system for testing splash-formation theories and sheet-ejection mechanisms, as they allow the characteristics of ejection sheets to be controlled independently of the bulk impact dynamics of droplets. |
| first_indexed | 2024-03-06T19:31:02Z |
| format | Journal article |
| id | oxford-uuid:1d79f912-08f8-40db-a898-7566d7632836 |
| institution | University of Oxford |
| last_indexed | 2024-03-06T19:31:02Z |
| publishDate | 2016 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | oxford-uuid:1d79f912-08f8-40db-a898-7566d76328362022-03-26T11:11:02ZIt's harder to splash on soft solidsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:1d79f912-08f8-40db-a898-7566d7632836Symplectic Elements at OxfordAmerican Physical Society2016Howland, CAntkowiak, ACastrejón-Pita, JHowison, SOliver, JStyle, RCastrejón-Pita, ADroplets splash when they impact dry, flat substrates above a critical velocity that depends on parameters such as droplet size, viscosity and air pressure. By imaging ethanol drops impacting silicone gels of different stiffnesses we show that substrate stiffness also affects the splashing threshold. Splashing is reduced or even eliminated: droplets on the softest substrates need over 70\% more kinetic energy to splash than they do on rigid substrates. We show that this is due to energy losses caused by deformations of soft substrates during the first few microseconds of impact. We find that solids with Young's moduli \lesssim 100kPa reduce splashing, in agreement with simple scaling arguments. Thus materials like soft gels and elastomers can be used as simple coatings for effective splash prevention. Soft substrates also serve as a useful system for testing splash-formation theories and sheet-ejection mechanisms, as they allow the characteristics of ejection sheets to be controlled independently of the bulk impact dynamics of droplets. |
| spellingShingle | Howland, C Antkowiak, A Castrejón-Pita, J Howison, S Oliver, J Style, R Castrejón-Pita, A It's harder to splash on soft solids |
| title | It's harder to splash on soft solids |
| title_full | It's harder to splash on soft solids |
| title_fullStr | It's harder to splash on soft solids |
| title_full_unstemmed | It's harder to splash on soft solids |
| title_short | It's harder to splash on soft solids |
| title_sort | it s harder to splash on soft solids |
| work_keys_str_mv | AT howlandc itshardertosplashonsoftsolids AT antkowiaka itshardertosplashonsoftsolids AT castrejonpitaj itshardertosplashonsoftsolids AT howisons itshardertosplashonsoftsolids AT oliverj itshardertosplashonsoftsolids AT styler itshardertosplashonsoftsolids AT castrejonpitaa itshardertosplashonsoftsolids |