Influence of turbulence intensity on particle drag coefficients

Doroodchi, E., Evans, G. M., Schwarz, M. P., Lane, G. L., Shah, N. and Nguyen, A. (2008). Influence of turbulence intensity on particle drag coefficients. In: Process Intensification and Innovation: Cleaner, Sustainable, Efficient Technologies for the Future. ECI Process Intensification S.I. Proceedings. Process Intensification and Innovation Process (PI)2 Conference II, Christchurch, NZ, (129-134). 24-29 September, 2006. doi:10.1016/j.cej.2007.03.026


Author Doroodchi, E.
Evans, G. M.
Schwarz, M. P.
Lane, G. L.
Shah, N.
Nguyen, A.
Title of paper Influence of turbulence intensity on particle drag coefficients
Conference name Process Intensification and Innovation Process (PI)2 Conference II
Conference location Christchurch, NZ
Conference dates 24-29 September, 2006
Convener Engineering Conferences International
Proceedings title Process Intensification and Innovation: Cleaner, Sustainable, Efficient Technologies for the Future. ECI Process Intensification S.I. Proceedings   Check publisher's open access policy
Journal name Chemical Engineering Journal   Check publisher's open access policy
Place of Publication Amsterdam, Netherlands
Publisher Elsevier
Publication Year 2008
Sub-type Fully published paper
DOI 10.1016/j.cej.2007.03.026
Open Access Status
ISSN 1385-8947
1873-3212
Volume 135
Issue 1-2
Start page 129
End page 134
Total pages 6
Language eng
Formatted Abstract/Summary
The effect of turbulent eddies on the motion of the dispersed phase is often ignored by assuming a standard drag coefficient as applied to quiescent flow. Such an assumption can lead to large errors when predicting the dispersed phase concentration profile of an industrial flow under turbulent conditions. Recently, [G.L. Lane, M.P. Schwarz, G.M. Evans, Numerical modelling of gas-liquid flow in stirred tanks, Chem. Eng. Sci. 60 (2005) 2203–2214] developed a model relating the drag coefficient to fluid turbulence characteristics through the dimensionless group Stokes number. Their model has been successfully applied to predict gas holdups of a mechanically stirred tank over the range of St < 0.7. The present study focused on broadening the analysis by Lane et al. Specifically, the aim was to examine the effects of dispersed phase density and size on the applied drag force under turbulent conditions and to extend the much needed experimental data on particle drag coefficients in free-stream turbulence, as a function of solid particles characteristics. This was achieved by a systematic experimental approach using particles of different sizes and densities in two distinct turbulent flow fields generated by oscillating grids. The results indicated that the reduction in settling velocity is a function of both particle size and density and turbulent characteristics with maximum interaction between the continuous and dispersed phases occurring at low ratios of particle density to liquid density and high turbulence intensities. Richardson number, a dimensionless group, was employed to capture the effects of these parameters on the drag coefficient.
Subjects 03 Chemical Sciences
09 Engineering
0904 Chemical Engineering
Keyword Drag coefficient
Isotropic turbulence
Particle settling velocity
Q-Index Code E1
Q-Index Status Provisional Code

 
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Created: Mon, 07 Dec 2009, 12:22:43 EST by Macushla Boyle on behalf of Faculty Of Engineering, Architecture & Info Tech