Flooding and drop size in a pulsed disc and doughnut extraction column |
| |
Authors: | Meisam Torab-Mostaedi Ahad GhaemiMehdi Asadollahzadeh |
| |
Affiliation: | a Nuclear Fuel Cycle Research School, Nuclear Science and Technology Research Institute, P.O. Box: 11365-8486, Tehran, Iran b Department of Chemical Engineering, Iran University of Science and Technology, P.O. Box: 16765-163, Tehran, Iran |
| |
Abstract: | The hydrodynamic behavior of a pulsed disc and doughnut column has been investigated using three different systems in the absence of mass transfer. Sauter-mean drop diameter (d32), flooding velocity and holdup at flooding have been measured at different operating conditions. The following operating variables have been studied: pulsation intensity and flow rate of both liquid phases. As expected, smaller mean drop sizes are obtained with the increase of pulsation intensity. The results also show no significant effect of continuous phase flow rate on mean drop size, which increases with increase of dispersed phase flow rate for the operating conditions investigated. A single correlation for the prediction of d32 in the mixer-settler, transition and emulsion regimes of operation is proposed with a mean deviation of 7.32%. The maximum throughput is influenced mainly by pulsation intensity and interfacial tension. Two precise correlations are proposed for predicting flooding velocities in this column. The first is based on operating variables, column geometry, and system physical properties. The second one considers the same variables, except column geometry. Good agreement between prediction and experiments is found for all operating conditions investigated. |
| |
Keywords: | Pulsed disc and doughnut column Flood point Holdup Sauter-mean drop diameter |
本文献已被 ScienceDirect 等数据库收录! |
|