Axial dispersion coefficient of the liquid phase in upward two-phase flow of air-liquid mixtures.

概要

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The axial dispersion coefficient of the liquid phase, E, and liquid holdup, RL, in upward two-phase flow of gas-liquid mixtures were measured by the moments analysis of response curves for an arbitrary imperfect pulsing of tracer (aqueous NaCl solution). Experiments were carried out in the annular and froth flow regions using vertical tubes of 9 mm, 16 mm and 28 mm inside diameter, and 8 m length. The effects of the velocities of gas and liquid, the tube diameter and the liquid viscosity on E and RL, were examined. The values of RL were represented well with the correlations of Yagi et al. and Hughmark and Pressburg. As to the axial dispersion coefficient, an empirical correlation was proposed using the parameter obtained from a modification of Taylor''s analysis.
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