A laser pulse focused near the closed end of a glass capillary partially filled with water creates a vapor bubble and an associated pressure wave. The pressure wave travels through the liquid toward the meniscus where it is reflected, creating a fast, focused microjet. In this study, we selectively coat the hydrophilic glass capillaries with hydrophobic strips along the capillary. The result after filling the capillary is a static meniscus which has a curvature markedly different than an unmodified capillary. This tilting asymmetry in the static meniscus alters the trajectory of the ensuing jets. The hydrophobic strips also influence the advancing contact line and receding contact line as the vapor bubble expands and collapses. We present thirteen different permutations of this system which includes three geometries and four coating schemes. The combination of geometry and coatings influences the jet breakup, the resulting drop size distribution, the trajectory of the jet tip, and the consistency of jet characteristics across trials. The inclusion of hydrophobic strips promotes jetting in line with the channel axis, with the most effective arrangement dependent on channel size.
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Cavitation-induced microjets tuned by channels with alternating wettability patterns
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March 2023
Research Article|
March 21 2023
Cavitation-induced microjets tuned by channels with alternating wettability patterns
Special Collection:
Cavitation
Jelle J. Schoppink
;
Jelle J. Schoppink
(Data curation, Formal analysis, Investigation, Methodology, Validation, Visualization, Writing – original draft, Writing – review & editing)
1
Mesoscale Chemical Systems Group, University of Twente
, Enschede, The Netherlands
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Keerthana Mohan
;
Keerthana Mohan
(Data curation, Formal analysis, Visualization, Writing – original draft, Writing – review & editing)
1
Mesoscale Chemical Systems Group, University of Twente
, Enschede, The Netherlands
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Miguel A. Quetzeri-Santiago;
Miguel A. Quetzeri-Santiago
(Data curation, Formal analysis, Investigation, Visualization, Writing – original draft, Writing – review & editing)
1
Mesoscale Chemical Systems Group, University of Twente
, Enschede, The Netherlands
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Gareth McKinley
;
Gareth McKinley
(Writing – review & editing)
2
Mechanical Engineering, Massachusetts Institute of Technology
, Cambridge, Massachusetts 02139, USA
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David Fernandez Rivas
;
David Fernandez Rivas
(Conceptualization, Funding acquisition, Project administration, Supervision, Writing – review & editing)
1
Mesoscale Chemical Systems Group, University of Twente
, Enschede, The Netherlands
2
Mechanical Engineering, Massachusetts Institute of Technology
, Cambridge, Massachusetts 02139, USA
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Andrew K. Dickerson
Andrew K. Dickerson
a)
(Conceptualization, Data curation, Formal analysis, Funding acquisition, Investigation, Project administration, Supervision, Validation, Visualization, Writing – original draft, Writing – review & editing)
3
Mechanical, Aerospace, and Biomedical Engineering, University of Tennessee
, Knoxville, Tennessee 37996, USA
a)Author to whom correspondence should be addressed: ad@utk.edu
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a)Author to whom correspondence should be addressed: ad@utk.edu
Note: This paper is part of the special topic, Cavitation.
Physics of Fluids 35, 032017 (2023)
Article history
Received:
January 20 2023
Accepted:
February 28 2023
Citation
Jelle J. Schoppink, Keerthana Mohan, Miguel A. Quetzeri-Santiago, Gareth McKinley, David Fernandez Rivas, Andrew K. Dickerson; Cavitation-induced microjets tuned by channels with alternating wettability patterns. Physics of Fluids 1 March 2023; 35 (3): 032017. https://doi.org/10.1063/5.0143223
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