1999
DOI: 10.1016/s0032-5910(98)00178-8
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Drag on non-spherical particles: an evaluation of available methods

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Cited by 288 publications
(126 citation statements)
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“…For Re greater than about 10 3 , C D becomes approximately constant as drag is dominated by the pressure drag rather than viscous drag, and hence C D is no longer influenced by viscosity. We also note, that for non-spherical particles, such as the clasts that are erupted, C D could be in error by as much as a factor of 2, though the error is likely less than 15 % (Chhabra et al, 1999). Figure 9 shows the predicted settling speeds for the muds with the highest and lowest yield stresses, Puianello and Regnano, respectively.…”
Section: Settling Speedmentioning
confidence: 99%
“…For Re greater than about 10 3 , C D becomes approximately constant as drag is dominated by the pressure drag rather than viscous drag, and hence C D is no longer influenced by viscosity. We also note, that for non-spherical particles, such as the clasts that are erupted, C D could be in error by as much as a factor of 2, though the error is likely less than 15 % (Chhabra et al, 1999). Figure 9 shows the predicted settling speeds for the muds with the highest and lowest yield stresses, Puianello and Regnano, respectively.…”
Section: Settling Speedmentioning
confidence: 99%
“…AERODYNAMIC DRAG OF IRREGULAR PARTICLES 144 Zhu et al, 2017), pyroclastic flows (e.g., Dellino et al, 2008;, eruptive columns (e.g., Cerminara et al, 2016;Folch et al, 2016), and distal ash clouds (e.g., Beckett et al, 2015;Bonadonna et al, 2012;Bonasia et al, 2010;Costa et al, 2012Costa et al, , 2006). Therefore, a major effort has been posed to find reliable shapedependent drag laws that work on the widest possible range of fluid dynamic regimes quantified by Re (Alfano et al, 2011;Bagheri & Bonadonna, 2016;Chhabra et al, 1999;Chien, 1994;Dellino et al, 2005;Dioguardi et al, 2017;Dioguardi & Mele, 2015;Ganser, 1993;Haider & Levenspiel, 1989;Hölzer & Sommerfeld, 2008;Loth, 2008;Pfeiffer et al, 2005;Swamee & Ojha, 1991;Tran-Cong et al, 2004;Wilson & Huang, 1979). These drag laws are a function of different shape descriptors, among which sphericity Φ is the most widely used.…”
Section: Introductionmentioning
confidence: 99%
“…One way to deal with this problem is by using the sphericity factor, S, and the volume equivalent diameter, d Veq , as geometric parameters and introducing orientation dependency in drag correlations using the effective area normal to the direction of the drag force. Chhabra et al [14] compared five of the most promising drag coefficient correlations with data, considering 1900 experimental data covering a wide range of particle shapes and hydrodynamic conditions. Based on the overall mean and maximum percentage errors, these authors recommended that the drag expression proposed by Ganser [3] is the most appropriate method for determining C D , with this expression having an overall error, against those data, of only 16%.…”
Section: Translational and Rotational Dynamicsmentioning
confidence: 99%