Droplet fragmentation using a mesh
Atomization and spray generation naturally occur around us in a wide variety of situations ranging from drop impacts to bubble bursting. However, controlling this process is key in many applications such as internal combustion engines, gas turbines, and agricultural spraying. Here we show how a drop...
| Main Authors: | , , , , , |
|---|---|
| Other Authors: | |
| Format: | Article |
| Published: |
American Physical Society
2019
|
| Online Access: | http://hdl.handle.net/1721.1/120136 https://orcid.org/0000-0003-0432-8524 https://orcid.org/0000-0003-0834-8047 https://orcid.org/0000-0002-6846-152X |
| _version_ | 1811091250833522688 |
|---|---|
| author | Quéré, David Soto, Dan Girard, Henri-Louis Le Helloco, Antoine Binder, Thomas Jean-Yves Varanasi, Kripa |
| author2 | Massachusetts Institute of Technology. Department of Mechanical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Mechanical Engineering Quéré, David Soto, Dan Girard, Henri-Louis Le Helloco, Antoine Binder, Thomas Jean-Yves Varanasi, Kripa |
| author_sort | Quéré, David |
| collection | MIT |
| description | Atomization and spray generation naturally occur around us in a wide variety of situations ranging from drop impacts to bubble bursting. However, controlling this process is key in many applications such as internal combustion engines, gas turbines, and agricultural spraying. Here we show how a drop can be fragmented into thousands of smaller droplets by impacting it onto a mesh. We demonstrate the unexpected possibility to transfer liquid outside the projected impact area of the drop and the existence of a well-defined cone envelope for the resulting spray. Self-similarity of the flow studied at the primary repeating unit - the hole - allows us to predict the global nature of the atomization process: mass transfer and spray geometry. We explain how these elementary units capture the momentum of the flow atop them and how side wall interactions can lead to saturation effects. At the grid level, this translates into surface fraction and hole aspect ratio being governing parameters of the system that can be tuned to control and optimize spray characteristics. As a result of the fragmentation, the momentum exerted on the target is reduced - a major advantage in crop protection and pathogen dispersion prevention under rain. In addition, pesticide drift in agricultural sprays can be controlled by using initially large drops that are subsequently atomized and conically sprayed by a mesh atop the crop. Beyond droplet-substrate interaction, this inexpensive spraying method enhances surface exchange phenomena such as evaporation and has major implications in many applications such as cooling towers or multieffect desalination. |
| first_indexed | 2024-09-23T14:59:31Z |
| format | Article |
| id | mit-1721.1/120136 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T14:59:31Z |
| publishDate | 2019 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/1201362022-10-01T23:49:25Z Droplet fragmentation using a mesh Quéré, David Soto, Dan Girard, Henri-Louis Le Helloco, Antoine Binder, Thomas Jean-Yves Varanasi, Kripa Massachusetts Institute of Technology. Department of Mechanical Engineering Soto, Dan Girard, Henri-Louis Le Helloco, Antoine Binder, Thomas Jean-Yves Varanasi, Kripa Atomization and spray generation naturally occur around us in a wide variety of situations ranging from drop impacts to bubble bursting. However, controlling this process is key in many applications such as internal combustion engines, gas turbines, and agricultural spraying. Here we show how a drop can be fragmented into thousands of smaller droplets by impacting it onto a mesh. We demonstrate the unexpected possibility to transfer liquid outside the projected impact area of the drop and the existence of a well-defined cone envelope for the resulting spray. Self-similarity of the flow studied at the primary repeating unit - the hole - allows us to predict the global nature of the atomization process: mass transfer and spray geometry. We explain how these elementary units capture the momentum of the flow atop them and how side wall interactions can lead to saturation effects. At the grid level, this translates into surface fraction and hole aspect ratio being governing parameters of the system that can be tuned to control and optimize spray characteristics. As a result of the fragmentation, the momentum exerted on the target is reduced - a major advantage in crop protection and pathogen dispersion prevention under rain. In addition, pesticide drift in agricultural sprays can be controlled by using initially large drops that are subsequently atomized and conically sprayed by a mesh atop the crop. Beyond droplet-substrate interaction, this inexpensive spraying method enhances surface exchange phenomena such as evaporation and has major implications in many applications such as cooling towers or multieffect desalination. 2019-01-28T17:11:30Z 2019-01-28T17:11:30Z 2018-08 2018-03 2019-01-08T19:34:15Z Article http://purl.org/eprint/type/JournalArticle 2469-990X 2469-9918 http://hdl.handle.net/1721.1/120136 Soto, Dan et al. “Droplet Fragmentation Using a Mesh.” Physical Review Fluids 3, 8 (August 2018): 083602 © 2018 American Physical Society https://orcid.org/0000-0003-0432-8524 https://orcid.org/0000-0003-0834-8047 https://orcid.org/0000-0002-6846-152X http://dx.doi.org/10.1103/PhysRevFluids.3.083602 Physical Review Fluids Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Physical Society APS |
| spellingShingle | Quéré, David Soto, Dan Girard, Henri-Louis Le Helloco, Antoine Binder, Thomas Jean-Yves Varanasi, Kripa Droplet fragmentation using a mesh |
| title | Droplet fragmentation using a mesh |
| title_full | Droplet fragmentation using a mesh |
| title_fullStr | Droplet fragmentation using a mesh |
| title_full_unstemmed | Droplet fragmentation using a mesh |
| title_short | Droplet fragmentation using a mesh |
| title_sort | droplet fragmentation using a mesh |
| url | http://hdl.handle.net/1721.1/120136 https://orcid.org/0000-0003-0432-8524 https://orcid.org/0000-0003-0834-8047 https://orcid.org/0000-0002-6846-152X |
| work_keys_str_mv | AT queredavid dropletfragmentationusingamesh AT sotodan dropletfragmentationusingamesh AT girardhenrilouis dropletfragmentationusingamesh AT lehellocoantoine dropletfragmentationusingamesh AT binderthomasjeanyves dropletfragmentationusingamesh AT varanasikripa dropletfragmentationusingamesh |