Cavitation-induced microjets tuned by channels with alternating wettability patterns

Jelle Schoppink, Keerthana Mohan, Miguel Quetzeri-Santiago, Gareth H. McKinley, David Fernandez Rivas, Andrew Keith Dickerson*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

6 Citations (Scopus)
94 Downloads (Pure)

Abstract

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.
Original languageEnglish
Article number032017
JournalPhysics of fluids
Volume35
Early online date21 Mar 2023
DOIs
Publication statusE-pub ahead of print/First online - 21 Mar 2023

Keywords

  • 2023 OA procedure

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