Drag on non-spherical particles in power law non-Newtonian media

PTV measurement of drag coefficient of fibrous particles with large aspect ratio

“…(10). (11) where V e1x is the velocity of endpoint 1 in the x direction; V e1y is the velocity of endpoint 1 in the y direction; V e2x is the velocity of endpoint 2 in the x direction; V e2y is the velocity of endpoint 2 in the y direction; x e12 is x axis coordinate of endpoint 1from the second image, x e11 is x axis coordinate of the endpoint 1from the first image; y e12 is y axis coordinate of the endpoint 1 from the second image and so on. In present study, V cx and V cy represent vertical and horizontal components of settling velocities of a fibrous particle respectively.…”

Steady Flow of Power Law Fluids across a Circular Cylinder

“…More recently, vortex shedding characteristics from a circular cylinder in power law fl uids have been studied by Coelho et al (1996) and Pinho (2003a, b, 2004) in the Reynolds number range 50-9000. Finally, while some results on the drag on freely falling non-spherical particles including short cylinders (l/d<∼ 10) in power law fl uids are available in the literature (Machac et al, 2002;Rajitha et al, 2006;Rodrigue et al, 1994;Unnikrishnan and Chhabra, 1990;Venu Madhav and Chhabra, 1994), there are virtually no results available on the cross fl ow of long cylinders. In summary, there is essentially only one numerical study (i.e., Chhabra et al, 2004;Soares et al, 2005) available in which the fl ow of power law fl uids has been examined for three values of the Reynolds number (5, 20 and 40) and for the power law index in the range (0.6 ≤ n ≤ 1.4).…”

Particulate systems

“…Most of the literature data for drag on non-spherical particles in power-law fluids has been collated recently ( Rajitha et al , 2006 ;Agarwal and Chhabra, 2007 ) and it was found that equation (5.7) with sphere diameter replaced by d s reproduced nearly 1000 individual data points (for cones, cylinders, square plates and disks, prisms, parallelepipeds, etc.) encompassing wide ranges of the flow behaviour index (0.31 Յ n Ͻ 1), of the Reynolds number ( ϳ 10 Ϫ 5 -300) and of sphericity (0.62 Յ ψ Յ 1) with a mean error of Ϯ 30%, albeit the maximum error was of the order of 80%.…”