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Minerals 2013, 3(3), 284-303; doi:10.3390/min3030284

Numerical Simulations of Two-Phase Flow in a Dorr-Oliver Flotation Cell Model

1
Department of Mechanical Power, Zagazig University, Zagazig 44519, Egypt
2
Department of Engineering Science and Mechanics, Virginia Tech, Blacksburg, VA 24061, USA
*
Author to whom correspondence should be addressed.
Received: 18 May 2013 / Revised: 5 July 2013 / Accepted: 2 August 2013 / Published: 9 August 2013
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Abstract

Two-phase (water and air) flow in the forced-air mechanically-stirred Dorr-Oliver machine has been investigated using computational fluid dynamics (CFD). A 6 m3 model is considered. The flow is modeled by the Euler-Euler approach, and transport equations are solved using software ANSYS-CFX5. Unsteady simulations are conducted in a 180-degree sector with periodic boundary conditions. Air is injected into the rotor at the rate of 2.63 m3/min, and a uniform bubble diameter is specified. The effects of bubble diameter on velocity field and air volume fraction are determined by conducting simulations for three diameters of 0.5, 1.0, and 2.0 mm. Air volume fraction contours, velocity profiles, and turbulent kinetic energy profiles in different parts of the machine are presented and discussed. Results have been compared to experimental data, and good agreement is obtained for the mean velocity and turbulent kinetic energy profiles in the rotor-stator gap and in the jet region outside stator blades. View Full-Text
Keywords: minerals flotation machines; void fraction; two phase flows; numerical simulation minerals flotation machines; void fraction; two phase flows; numerical simulation
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Salem-Said, A.-H.; Fayed, H.; Ragab, S. Numerical Simulations of Two-Phase Flow in a Dorr-Oliver Flotation Cell Model. Minerals 2013, 3, 284-303.

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