Computational Fluid Dynamic study on the effect of near gravity material on dense medium cyclone treating coal using Discrete Phase Model and Algebraic Slip mixture multiphase model

Aketi, V A K and Vakamalla, T R and Mangadody, Narasimha and Sreedhar, G E and Shivakumar, R and Rajan, Kumar (2017) Computational Fluid Dynamic study on the effect of near gravity material on dense medium cyclone treating coal using Discrete Phase Model and Algebraic Slip mixture multiphase model. The Journal of Computational Multiphase Flows, 9 (2). pp. 58-70. ISSN 1757-482X

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Abstract

In this paper, the effect of near gravity material at desired separation density during the coal washing is studied. It is believed that the Dense Medium Separation of coal particles in the presence of high percentage of near gravity material, results in a significant misplacement of coal particles to wrong products. However the performance of dense medium cyclone does not merely depend on the total amount of near gravity materials but also on their distribution as well as on their quality. This paper deals with numerical simulation of magnetite medium segregation and coal partitioning handled in a 350 mm dense medium cyclone. Volume of Fluid coupled with Reynolds Stress Model is used to resolve the two-phase air-core and turbulence. Algebraic Slip mixture multiphase model with the granular options are considered to predict magnetite medium segregation. Medium segregation results are validated against Gamma Ray Tomography measurements. Further, Discrete Phase Model is used to track the coal particles. Residence Time Distribution of different size and density coal particles are also estimated using Discrete Phase Model. Additionally, Algebraic Slip mixture model is also utilised to simulate magnetite and coal particle segregation at different near gravity material proportions. Discrepancies in the coal particle behaviour at different near gravity material content are explained using locus of zero vertical velocities, mixture density, coal volume fractions.

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IITH Creators:

IITH Creators	ORCiD
Mangadody, Narasimha	http://orcid.org/0000-0002-3123-2811

Item Type:

Article

Additional Information:

The author(s) disclosed receipt of the following financial sup- port for the research, authorship, and/or publication of this article: Authors would like to express their sincere thanks to NMDC Limited, India, for their generous financial support and encouragement to undertake these studies. Authors also want to extended their thanks to Confederation of Indian Industry (CII), Government of India for the Prime Minister fellowship.

Uncontrolled Keywords:

Dense medium cyclone, Discrete Phase Model, near gravity material, residence time, Algebraic Slip mixture

Subjects:

Chemical Engineering

Divisions:

Department of Chemical Engineering

Depositing User:

Team Library

Date Deposited:

10 Jul 2017 09:48

Last Modified:

22 Dec 2017 04:51