Actions for Turbulent dispersion results from gel-sphere processes and application to centrifugal contactors [electronic resource].

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Turbulent dispersion results from gel-sphere processes and application to centrifugal contactors [electronic resource].

Published
Oak Ridge, Tenn. : Oak Ridge National Laboratory, 1986.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description
Pages: 39 : digital, PDF file
Additional Creators
Oak Ridge National Laboratory and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Three different devices using controlled velocities of organic liquids were applied to disperse aqueous solutions as drops. One consisted of simple tubes of small diameters. A second contained motionless mixer units inside large tubes. The third employed couette flow of the organic liquid between a cylindrical rotor and a stationary cylinder. These devices were applied to gel-sphere processes in which the liquid drops are converted into solid gel spheres of hydrated metal oxides. The gel-sphere products are good, strong spheres and allow good measurement of the sphere and the drop-size distributions. The drop diameters must be controlled and predictable to allow preparation of product spheres of the desired sizes. Empirical correlations were determined for application to the gel-sphere processes. The theory of turbulent dispersion based on eddy velocities has been developed by Kolmorogoff, Hinze, and others. Davies reviewed this theory and the agreement of theory with four types of dispersion devices for energy dissipation rates of 6 to 400,000 W/g. The gel-sphere results for drop-size distribution are for energy dissipation rates of 10/sup -3/ to 1.5 W/g. Those combined results support the theory of turbulence as the dispersion mechanism over a range of 10/sup 9/ for the rate of energy dissipation. The turbulent dispersion with Couette flow is the mechanism for mixing in an advanced design of centrifugal contactors for solvent extraction. The theory of turbulence is applied to predict drop sizes and mixing power for centrifugal contactors as developed at Oak Ridge National Laboratory (ORNL). 14 refs., 7 figs., 6 tabs.
Report Numbers
E 1.99:ornl/tm-9950
ornl/tm-9950
Subject(s)
Note
Published through SciTech Connect.
07/01/1986.
"ornl/tm-9950"
"DE86014395"
Haas, P.A.
Funding Information
AC05-84OR21400
View MARC record | catkey: 23770144