Back to Search
Start Over
Drop Bouncing Dynamics on Ultrathin Films
- Source :
- Langmuir. 37:10135-10142
- Publication Year :
- 2021
- Publisher :
- American Chemical Society (ACS), 2021.
-
Abstract
- For drops to contact various surfaces, the removal of the interstitial fluid is the prerequisite to contact. While the conventional understanding is for drops to irreversibly spread on a film made of the same substance, we describe the dynamics of drops initiating contact yet carrying enough momentum to completely lift off of the substrate which we label as contact bouncing. We report new experimental results of the dynamics between drops impacting thin films described by the ratio of the liquid film hL to the drop with diameter D0 for the range of 0.004 < hL/D0 < 0.08. Using high-speed interferometry, we visualize the interfacial gas layer spatiotemporal signatures across the various film thicknesses and Weber numbers. We find that while increasing the deformability of the thin films enhances the gas entrainment phenomenon at early times, it also increases the rate of the gas purging rate, increasing the chance of contact just prior to the gas film retraction and drop lift off sequence. Drops which contact the liquid film during the retraction stage are able to bounce with
- Subjects :
- Entrainment (hydrodynamics)
Range (particle radiation)
Momentum (technical analysis)
Materials science
Drop (liquid)
Surfaces and Interfaces
Substrate (electronics)
Condensed Matter Physics
Lift (force)
Electrochemistry
General Materials Science
Thin film
Composite material
Layer (electronics)
Spectroscopy
Subjects
Details
- ISSN :
- 15205827 and 07437463
- Volume :
- 37
- Database :
- OpenAIRE
- Journal :
- Langmuir
- Accession number :
- edsair.doi.dedup.....dc0001ba8c0abfb97875e346c2c3d896