Bubble dynamics in a pore-doublet system under vibration

The dynamics of trapped gas bubbles in porous media under vibrational excitation are crucial for understanding multiphase transport behavior. While conventional single-channel models often neglect the presence of bypass wetting flow, such flow paths can significantly influence bubble resonance and mobilization thresholds. In this study, we develop a pore-doublet model that explicitly captures the interaction between a trapped non-wetting bubble and the bypassing wetting phase within a two-channel pore geometry. By integrating capillary, viscous, and inertial forces, the model reveals how bypass wetting flow affects the oscillatory behavior of the bubble under harmonic vibration. Analytical and numerical analyses in both the frequency and time domains show distinct differences between pore-doublet and single-channel models, particularly in terms of resonance frequency shifts and amplitude responses related to effective permeability. The model is further validated against computational fluid dynamics simulations. These results provide new insights into bubble–fluid interactions in vibrated porous systems and offer a framework for modeling multiphase flow under dynamic excitation.