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Unsteady effects in dense, high speed, particle laden flows

Regele, J. D. and Rabinovitch, J. and Colonius, T. and Blanquart, G. (2014) Unsteady effects in dense, high speed, particle laden flows. International Journal of Multiphase Flow, 61 . pp. 1-13. ISSN 0301-9322.

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Dense high speed non-compacted multiphase flows exist in variable phase turbines, explosions, and ejector nozzles, where the particle volume fraction is in the range 0.001<α_d<0.5. A canonical problem that can be used to study modeling issues related to these types of flows is a shock wave impacting a planar particle cloud. Thus far, prior work has modeled the flow using a 1-D volume-averaged point particle approach and developed momentum and energy coupling terms that reproduce accurately the trajectory of particles in the experiments. Although these early results are promising, it is appropriate to question whether all aspects of the experimental flow can be captured using a one-dimensional model that is traditionally only used for dilute flows. Thus the objective of this work is to set-up a two-dimensional configuration that captures qualitatively the multidimensional behavior of a real three-dimensional particle cloud, but can be used as an exact solution to compare with an equivalent volume-averaged model. The 2-D data is phase-averaged to reduce it to one dimension, and x–t diagrams are used to characterize the flow behavior. These results show the importance of the Reynolds stress term inside the particle cloud and in its turbulent wake. A one-dimensional (1-D) model is developed for direct comparison with the 2-D simulation. While the 1-D model characterizes the overall steady-state flow behavior well, it fails to capture aspects of the unsteady behavior inside and behind the particle cloud because it neglects important unclosed terms.

Item Type:Article
Related URLs:
URLURL TypeDescription
Rabinovitch, J.0000-0002-1914-7964
Colonius, T.0000-0003-0326-3909
Blanquart, G.0000-0002-5074-9728
Additional Information:© 2014 Elsevier Ltd. Received 9 May 2013. Received in revised form 24 December 2013. Accepted 29 December 2013. Available online 9 January 2014.
Subject Keywords:Dense particle cloud; Shock wave; Particle laden; Drag coefficient
Record Number:CaltechAUTHORS:20140515-110845791
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Official Citation:J.D. Regele, J. Rabinovitch, T. Colonius, G. Blanquart, Unsteady effects in dense, high speed, particle laden flows, International Journal of Multiphase Flow, Volume 61, May 2014, Pages 1-13, ISSN 0301-9322, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45764
Deposited By: Ruth Sustaita
Deposited On:15 May 2014 18:43
Last Modified:03 Oct 2019 06:35

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