2025/07/16 by Yusuke Koide, Takato Ishida, Koide, Yusuke +5 · 2 citations
Chemistry · Engineering · #Surfactants and Colloidal Systems #Fluid Dynamics Simulations and Interactions #Electrostatics and Colloid Interactions
paper · pdf · doi:10.48550/arxiv.2507.11923
We investigate the steady-state extensional viscosity of wormlike micellar solutions using dissipative particle dynamics simulations. As the extension rate increases, the steady-state extensional viscosity initially increases and subsequently decreases after reaching a maximum, as observed in experiments. We reveal that this nonmonotonic behavior arises from the competition between micellar stretching and scission under uniaxial extensional flow. We further propose a relation that connects the extensional viscosity to micellar structures and kinetics. This relation provides a unified description of the extensional viscosity of unentangled wormlike micellar solutions for various temperatures, concentrations, and extension rates.