Investigation of Capillary Filling Dynamics of Multicomponent Fluids in Straight and Periodically Constricted Microchannels

• DOI: 10.1021/acs.langmuir.0c00128
• Publication Date: 2020-04-30T21:39:18Z
• Authors: Kiarash Keshmiri; Haibo Huang; Abebaw B. Jemere; Neda Nazemifard
• Keywords: 01 natural sciences; 0104 chemical sciences

An extensive study of capillary flow fluids with various viscosities in straight and periodically constricted microchannels different surface wettability is presented. Capillary filling speed hydrophilic, less hydrophobic were experimentally monitored compared the Washburn theoretical model. For all liquids, a linear relationship was found between square propagation distance time, which expected for Newtonian fluids. Experimental results indicated slower velocity to prediction due simplifications into long-fluororinated chain silane modified channels confirmed lyophobic nature coating (i.e., not favorable either hydrophilic or liquids). Presence precursor film ahead three-phase contact line microscopic level demonstrated. White light fluorescent images presence evaporation at interface. Evaporation enhanced deviation experimental continuous alteration penetrating fluid.