Surfactant-laden interfacial flow: dynamics of contact-line within a straight capillary tube
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We study the pinch-off dynamics of a fluid surrounded by a significantly more viscous one during fluid--fluid displacement in straight, cylindrical capillary tubes, where the interface evolves under the influence of a moving contact line. We investigate the influence of insoluble surfactants on the dynamics of both the contact line and pinch-off singularities. We focus on a visco-capillary displacement regime where the imposed flow rate exceeds a critical threshold, beyond which the contact line velocity is governed by the partial wettability of the confined geometry, becoming independent of the flow rate.
