Cavitation-induced microjets tuned by channels with alternating wettability patterns

A laser pulse focused near the closed end of a glass capillary partially filled with water creates vapor bubble and an associated pressure wave. The wave travels through liquid toward meniscus where it is reflected, creating fast, microjet. In this study, we selectively coat hydrophilic capillaries hydrophobic strips along capillary. result after filling static which has curvature markedly different than unmodified This tilting asymmetry in alters trajectory ensuing jets. also influence advancing contact line receding as expands collapses. We present thirteen permutations system includes three geometries four coating schemes. combination geometry coatings influences jet breakup, resulting drop size distribution, tip, consistency characteristics across trials. inclusion promotes jetting channel axis, most effective arrangement dependent on size.