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International Journal of Chemical Engineering
Volume 2011 (2011), Article ID 791218, 11 pages
http://dx.doi.org/10.1155/2011/791218
Research Article

Study of the Pressure Drop and Flow Field in Standard Gas Cyclone Models Using the Granular Model

1Department of Mechanical Engineering, Petroleum Institute, Abu Dhabi, P.O. Box 2533, United Arab Emirates
2Département de Génie Mécanique, Faculté des Sciences de l'Ingénieur, Université Mentouri Constantine, Constantine 25017, Algeria

Received 17 March 2011; Accepted 3 May 2011

Academic Editor: Fernando T. Pinho

Copyright © 2011 Nabil Kharoua et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A particle-laden flow inside solid gas cyclones has been studied using computational fluid dynamics (CFD). The effects of high temperatures and different particle loadings have been investigated. The Reynolds stress (RSM) model-predicted results, in the case of pure gas, are within engineering accuracy even at high temperatures. Using the granular mixture model for the cases of particle-laden flow, discrepancies occurred at relatively high loadings (up to 0.5 kg/m3). Since the pressure drop is strongly related to the friction inside the cyclone body, the concept of entropy generation has been employed to detect regions of high frictional effects. Friction has been observed to be important at the vortex finder wall, the bottom of the conical-part wall, and the interface separating the outer and the core streams. The discrepancies between the present numerical simulation and the experimental results taken from the existing literature, which are caused by the mixture and turbulence models simplifying assumptions, are discussed in this paper.