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Stability of axisymmetric core–annular flow in the presence of an insoluble surfactant

  • M. G. BLYTH (a1), H LUO (a2) and C. POZRIKIDIS (a2)

Abstract

The effect of an insoluble surfactant on the stability of the core–annular flow of two immiscible fluids is investigated by a normal-mode linear analysis and by numerical simulations based on the immersed-interface method for axisymmetric perturbations. The results reveal that, although the Marangoni stress due to surfactant concentration variations is unable to initiate a new type of instability as in the case of two-dimensional two-layer channel flow, it does destabilize the interface by broadening the range of growing wavenumbers and by raising the growth rate of unstable perturbations. Numerical simulations for large-amplitude disturbances reveal that the surfactant plays an important role in determining the morphology of the interfacial structures developing in the nonlinear stages of the motion.

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Stability of axisymmetric core–annular flow in the presence of an insoluble surfactant

  • M. G. BLYTH (a1), H LUO (a2) and C. POZRIKIDIS (a2)

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