title: Burst behavior at a capillary tip: Effect of low and high surface tension.
abstract: Liquid retention in micron and millimeter scale devices is important for maintaining stable interfaces in various processes including bimolecular separation, phase change heat transfer, and water desalination. There have been several studies of re-entrant geometries, and very few studies on retaining low surface tension liquids such as fluorocarbon-based dielectric liquids. Here, we study retention of a liquid with very low contact angles using borosilicate glass capillary tips. We analyzed capillary tips with outer diameters ranging from 250 to 840 μm and measured Laplace pressures up to 2.9 kPa. Experimental results agree well with a numerical model that predicts burst pressure (the maximum Laplace pressure for liquid retention), which is a function of the outer diameter (D) and capillary exit edge radius of curvature (r).
authors.affiliation: Department of Mechanical Engineering, Stanford University, 440 Escondido Mall, Bldg. 530, Room 224, Stanford, CA 94305-3030, USA. Electronic address: agonafer@stanford.edu.
authors.forename: Damena D
authors.initials: DD
authors.lastname: Agonafer
authors.affiliation: Department of Mechanical Engineering, Stanford University, 440 Escondido Mall, Bldg. 530, Room 224, Stanford, CA 94305-3030, USA.
authors.forename: Ken
authors.initials: K
authors.lastname: Lopez
authors.affiliation: Department of Mechanical Engineering, Stanford University, 440 Escondido Mall, Bldg. 530, Room 224, Stanford, CA 94305-3030, USA.
authors.forename: James W
authors.initials: JW
authors.lastname: Palko
authors.affiliation: Department of Mechanical Engineering, Stanford University, 440 Escondido Mall, Bldg. 530, Room 224, Stanford, CA 94305-3030, USA.
authors.forename: Yoonjin
authors.initials: Y
authors.lastname: Won
authors.affiliation: Department of Mechanical Engineering, Stanford University, 440 Escondido Mall, Bldg. 530, Room 224, Stanford, CA 94305-3030, USA.
authors.forename: Juan G
authors.initials: JG
authors.lastname: Santiago
authors.affiliation: Department of Mechanical Engineering, Stanford University, 440 Escondido Mall, Bldg. 530, Room 224, Stanford, CA 94305-3030, USA.
authors.forename: Kenneth E
authors.initials: KE
authors.lastname: Goodson
keywords: Canthotaxis effect; Liquid pinning; Low surface tension liquids; Phase separation; Superomniphobic surfaces