Abstract
The interplay of mass transfer and reaction in two-phase systems exhibiting oscillatory behavior has been investigated. A distributed model, based on partial differential equations describing unsteady mass transfer and reaction at the interface and ordinary differential equations describing reaction in the bulk phases, has been developed. Two reaction systems—an abstract two-variable chemical mechanism and a three-variable kinetic model describing the oxidation of benzaldehyde—have been studied. Numerical simulation and stability analysis reveal that the simultaneous occurrence of mass transfer and reaction at the interface can affect the dynamic behavior. Oscillatory behavior, multiple steady states, and enhancement of the rate of diffusive transport across the interface are predicted by the distributed model; simulation with a simpler mass transfer model (which assumes no reaction near the interface) shows only a single, sometimes oscillatory, stable state.
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