Regime mapping of multiple breakup of droplets in shear flow by phase-field lattice Boltzmann simulation

Multiple breakup refers to a sequence of events through which single droplet eventually produces multiple daughter droplets in shear flow. It is more common phenomenon than binary breakup. Using phase-field lattice Boltzmann method, this work investigates the effects Reynolds number, capillary number and soluble surfactant on We find that regime map for surfactant-free flow can be segmented into non-breakup, elementary breakup, filament coalescence regimes. By contrast, multiple-breakup widens narrows system surfactant. This difference macroscale regimes originates from mesoscale behaviour caused by interaction While hinders at lower Re, it promotes higher Re. The interfaces around breaking points are stretched opposite reaction Marangoni stress. gives given flow, correlation proposed calculate composition events, viz. ternary events.