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The influence of the drag force due to the interstitial gas on granular flows down a chute

Zhang, Yonghao and Reese, Jason (2000) The influence of the drag force due to the interstitial gas on granular flows down a chute. International Journal of Multiphase Flow, 26 (12). pp. 2049-2072. ISSN 0301-9322

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Abstract

Fully-developed steady flow of granular material down an inclined chute has been a subject of much research interest, but the effect of the interstitial gas has usually been ignored. In this paper, new expressions for the drag force and energy dissipation caused by the interstitial gas (ignoring the turbulent fuctuations of the gas phase) are derived and used to modify the governing equations derived from the kinetic theory approach for granular±gas mixture flows, where particles are relatively massive so that velocity fluctuations are caused by collisions rather than the gas flow. This new model is applied to fully-developed, steady mixture flows down an inclined chute and the results are compared with other simulations. Our results show that the effect of the interstitial gas plays a significant role in modifying the characteristics of fully developed flow. Although the effect of the interstitial gas is less pronounced for large particles than small ones, the flowfields with large particles are still very different from granular flows which do not incorporate any interactions with the interstitial gas.

Item type: Article
ID code: 36481
Keywords: granular flows, kinetic theory, particles, chute flow, drag, drag force, influence, interstitial gas, chute, Mechanical engineering and machinery, Physics and Astronomy(all), Mechanical Engineering, Fluid Flow and Transfer Processes
Subjects: Technology > Mechanical engineering and machinery
Department: Faculty of Engineering > Mechanical and Aerospace Engineering
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Depositing user: Pure Administrator
Date Deposited: 19 Dec 2011 12:32
Last modified: 05 Sep 2014 14:23
URI: http://strathprints.strath.ac.uk/id/eprint/36481

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