Abstract
Longitudinal mixing characteristics have been determined in an asymmetric rotating disc contactor for the continuous phase in two-phase flow. Comparison with longitudinal mixing in single-phase flow does not reflect adequately the actual hydrodynamic regime in the type of extractor under consideration, where longitudinal mixing in the continuous phase is substantially more extensive. This is attributed to the countercurrent flow of the dispersed phase, observed mainly at high dispersed-phase flow rates. A simple model is suggested, based on the idea of entrainment, in the wake of monodisperse drops, of a certain quantity of the continuous phase, in proportion to the surface area of the drops. The description of this phenomenon has enabled us to broaden the applicability of the expression for back flow in the existing correlation, derived for single-phase flow Processing of the experimental data proved that both the method of injection into the stationary continuous phase, and the relation proposed for evaluating the extent of longitudinal mixing were suitable for investigating two-phase systems.
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