Journal article
Postcontact droplet spreading and bubble entrapment on a smooth surface
PHYSICAL REVIEW FLUIDS, v 7(10), 104003
18 Oct 2022
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
In this paper, we use a combination of high-speed imaging and total internal reflection microscopy to study postcontact spreading dynamics and bubble entrapment of droplets impacting on surfaces lubricated with an immiscible fluid, following dimple and film modes of contact. The postcontact droplet spreading entraps two types of bubbles: (i) surface and (ii) bulk, where the former occurs when the bubbles remain at the dropletsurface interface and the latter takes place within the droplet because of the impact-induced air-cavity closure. The dimple mode of droplet-surface contact shows an absence of central surface bubble due to the contact point at the drop center and the subsequent axisymmetric spreading. The surface radial bubbles can be suppressed by tuning the impact velocity, liquid surface tension, and viscosity. Early-stage postcontact spreading dynamics are then studied for the dimple mode, where a viscocapillary scaling for the spreading radius rwet versus time t of rwet similar to t is observed. Finally, the critical capillary number for wetting failure scaling is used to predict the presence of surface radial bubble entrapment with good accuracy.
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Details
- Title
- Postcontact droplet spreading and bubble entrapment on a smooth surface
- Publication Details
- PHYSICAL REVIEW FLUIDS, v 7(10), 104003
- Publisher
- AMER PHYSICAL SOC; COLLEGE PK
- Grant note
- Support for this work was provided by the US National Science Foundation under Grant No. CBET-1705745.
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Drexel University
- Web of Science ID
- WOS:000875775400001
- Scopus ID
- 2-s2.0-85141622051
- Other Identifier
- 991021861194704721
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InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Web of Science research areas
- Physics, Fluids & Plasmas