Effects of viscosity ratio and surface wettability on viscous fingering instability in rectangular channel

• DOI: 10.1142/s0129183124500724
• Publication Date: 2023-10-27T08:29:17Z
• Authors: Akhileshwar Singh; Deepak Kumar Singh; Yogesh Singh; Krishna Murari Pa...
• Keywords: Viscous fingering; Necking; Microchannel; Wetting transition

This paper explores the impact of viscosity ratio and surface wettability on immiscible viscous fingering instability within a rectangular channel. Numerical investigations are conducted across range ratios (VR) from 0.0009 to 0.5 wall ([Formula: see text]) 15° 150°. The volume fluid (VOF) model is employed track development finger-shaped at interface. Our results indicate that higher lead increased displacement efficiency. Additionally, we find formation necking low VR, which diminishes VR values. pattern splits into two parts 15°; beyond this threshold, no such splitting occurs. Furthermore, transition hydrophilic superhydrophobic abolishes necking, resulting in enhanced Notably, as shifts super hydrophobic, toward left side. These findings hold relevance for applications drug delivery, clinical processes oil recovery.