CFD simulation of particulate flow in a spiral concentrator

Gamal M. A. Mahran; Mohamed A. Doheim; Mohamed H. Abu-Ali; Ahmed F. Abdel

doi:10.3139/120.110774

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CFD simulation of particulate flow in a spiral concentrator

Gamal M. A. Mahran , Mohamed A. Doheim , Mohamed H. Abu-Ali und Ahmed F. Abdel

Veröffentlicht/Copyright: 31. August 2015

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Abstract

A spiral concentrator is a gravity concentration device. It was invented by Humphreys in 1941. Firstly, it was designed and developed based on experience and by extensive testing of prototypes and modifications. The main objective of the present study is the simulation of the particulate flow of more realistic solid concentrations (i. e., 15 wt.-% solids) in a spiral separator. This study is based on the Eulerian approach and renormalization group k-∊ turbulence modeling. The results focus on particulate flow characteristics such as velocity, distribution and concentration of particulates on the spiral trough. The predicted results were compared with the experimental results in case of LD9 coal spiral. Comparisons between numerical and measured data showed good agreement.

Kurzfassung

Bei einem Spiralkonzentrator handelt es sich um eine gravimetrische Konzentrationseinrichtung. Diese wurde durch Humphreys bereits 1941 erfunden. Sie wurde zunächst basierend auf Erfahrungen und durch Prüfen von Prototypen und deren Modifikation designed und entwickelt. Das Hauptziel der diesem Beitrag zugrunde liegenden Studie besteht darin, den Partikelfluss einer realistischeren Konzentration an Festbestandteilen, nämlich 15 wt.-%, in einem Spiralkonzentrator zu simulieren. Die Studie basiert auf einem Ansatz nach Euler und der Modellierung der Renormalisationsgruppe einer k-∊ Turbulenz. Die Ergebnisse konzentrieren sich auf die Partikelflusseigenschaften wie Geschwindigkeit sowie Konzentration und Verteilung der Partikel auf dem Schneckentrog. Die vorhergesagten Ergebnisse wurden mit experimentellen Ergebnissen für den Fall einer LD9 Kohlespirale verglichen. Der Vergleich zwischen den numerischen und experimentellen Werten zeigte eine gute Übereinstimmung.

§Correspondence Address, Assistant Prof. Dr. Gamal M. A. Mahran, Deanship of Graduate Studies, P.O. Box 80217, King Abdulaziz University, Jeddah 21589, Kingdom of Saudi Arabia. E-mail: gamalmahran@hotmail.com

Dr. Gamal M. A. Mahran, born 1968, is Assistant Professor in the Deanship of Graduate Studies, King Abdulaziz University, Jeddah, Saudi Arabia. He received his BSc from the Mining Engineering Dept., Assiut University, Egypt, in 1991 and his MSc from the Mining Engineering Dept., Al-Azhar University, Egypt, in 2000. In 2009, he accomplished his PhD at the Mining Engineering Dept., Assiut University, Egypt. His fields of interest are mineral processing, modeling and simulation as well as computational fluid mechanics.

Prof. Mohamed A. Doheim, born 1941, is Professor at the Mining Engineering Dept. Assiut University, Assiut, Egypt. He received his BSc from the Chemical Engineering Dept., Faculty of Engineering Alexandria University, Egypt, in 1962 and his PhD from Leeds University, UK, in 1968.

Prof. Mohamed H. Abu-Ali, born 1958, is Professor in the Mining Engineering Dept. Assiut University, Assiut, Egypt. He received his BSc and MSc from the Mining Engineering Dept., Assiut University, Egypt, in 1981 and 1987, respectively. In 1994, he achieved his PhD in the Mining Engineering Dept., Assiut University, Egypt. His fields of interest are unit operations in mineral processing, modeling and beneficiation of ores.

Prof. Ahmed F. Abdel Gawad, born 1968, is Professor for Computational Fluid Mechanics in the Mechanical Power Engineering Department, Faculty of Engineering, Zagazig University, Zagazig, Egypt. Currently, he is working at the Umm Al-Qura University, Makkah, Saudi Arabia. His fields of interest are computational fluid dynamics, turbulence modeling and simulation as well as computational fluid dynamics in mining applications.

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Published Online: 2015-08-31

Published in Print: 2015-09-01

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