Abstract
We consider spontaneous oscillation phenomena in three–phase liquid membrane systems in a horizontally-placed glass tube with different solutes in the aqueous phase and different oil phase solvents. The relationship between the induction period of electrical potential oscillation and the initial concentration of solute in the source aqueous phase highlights the importance of the density difference owing to differential concentrations of solute. Numerical calculations confirmed the effects of the density difference and revealed the occurrence of buoyant convection in the oil liquid membrane phase. The convection flow (buoyant convection roll) transported solute, which induced Marangoni convection at the interface between the oil phase and the receiving aqueous phase. Our new experimental and numerical approaches taking into account the density difference provide an explanation for the spontaneous non-linear oscillation phenomena at the oil/water interface in horizontal three-phase liquid membrane systems.
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