Soft substrates suppress droplet splashing
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...
| Glavni autori: | , , , , , , |
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| Format: | Journal article |
| Izdano: |
2016
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| _version_ | 1826257701350408192 |
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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 $\lesssim 100$kPa 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 | 2024-03-06T18:22:19Z |
| format | Journal article |
| id | oxford-uuid:06b84e3a-cfc8-4315-b42e-91374e1d798c |
| institution | University of Oxford |
| last_indexed | 2024-03-06T18:22:19Z |
| publishDate | 2016 |
| record_format | dspace |
| spelling | oxford-uuid:06b84e3a-cfc8-4315-b42e-91374e1d798c2022-03-26T09:03:58ZSoft substrates suppress droplet splashingJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:06b84e3a-cfc8-4315-b42e-91374e1d798cSymplectic Elements at Oxford2016Howland, 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 $\lesssim 100$kPa 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 Soft substrates suppress droplet splashing |
| title | Soft substrates suppress droplet splashing |
| title_full | Soft substrates suppress droplet splashing |
| title_fullStr | Soft substrates suppress droplet splashing |
| title_full_unstemmed | Soft substrates suppress droplet splashing |
| title_short | Soft substrates suppress droplet splashing |
| title_sort | soft substrates suppress droplet splashing |
| work_keys_str_mv | AT howlandc softsubstratessuppressdropletsplashing AT antkowiaka softsubstratessuppressdropletsplashing AT castrejonpitaj softsubstratessuppressdropletsplashing AT howisons softsubstratessuppressdropletsplashing AT oliverj softsubstratessuppressdropletsplashing AT styler softsubstratessuppressdropletsplashing AT castrejonpitaa softsubstratessuppressdropletsplashing |