CFD Study of Homogenization with Dual Rushton Turbines—Comparison with Experimental Results

CFD modeling of pilot-scale pump-mixer: Single-phase head and power characteristics

“…Effect of impeller diameter to tank diameter ratio on power number for batch vessels has also been reported extensively (Rushton et al, 1950;Bates et al, 1963;Bujalski et al, 1987;Ibrahim and Nienow, 1995;Chapple et al, 2002). Two studies report on the effect of impeller diameter to tank diameter ratio on the power number for a pump-mixer (Singh et al, 2003(Singh et al, , 2004.…”

“…Consequently, several general approaches have been reported in literature on explicit simulation of whole flow field in agitated tanks. The three main generalized approaches are multiple reference frame (MRF) approach (Luo et al, 1994;Bujalski et al, 2002), computational snapshot approach (Ranade et al, 1996(Ranade et al, , 2001) and sliding mesh (SM) approach (Perng and Murthy, 1993;Murthy et al, 1994;Tabor et al, 1996;Lee et al, 1996;Daskopoulos and Harris, 1996). While the first two approaches involve steady state computations and produce time averaged flow field, the third approach involves transient computations to produce time accurate flow field.…”

“…Effect of impeller blade width on power consumption in batch stirred tanks has been reported either as effect of blade width to tank diameter ratio (Bates et al, 1963) or as effect of impeller disk thickness to impeller diameter ratio (Bujalski et al, 1987;Rutherford et al, 1996;Chapple et al, 2002). Effect of blade width on power consumption in continuous flow pump-mixer has also been reported (Singh et al, 2003).…”

“…These studies have been done for different impellers and results have been presented as power number-Reynolds number curves which can be used for design of the impeller (Rushton et al, 1950;Bujalski et al, 1987;Ibrahim and Nienow, 1995;Vasconcelos et al, 2000;Chapple et al, 2002;Shekhar and Jayanti, 2002). Similar studies on effect of impeller speed on power consumption have been done for pump-mixers (Singh et al, 2003(Singh et al, , 2004.…”

Investigation of Mixing in Shear Thinning Fluids Using Computational Fluid Dynamics

“…In the outer region, the relatively small time derivative terms can be neglected. Upon comparing numerical predictions obtained from applying different impeller modeling methodologies, several investigators observed that steady state methods such as MRF can i. provide reasonable predictions to flow field features and power consumption (Jaworski et al, 2001;Bujalski et al, 2002;Kelly & Gigas, 2003;Khopkar et al, 2004;Aubin et al, 2004;Sommerfeld & Decker, 2004;Khopkar et al, 2006), and ii. save about one-seventh of the CPU-time (Brucato et al, 1998).…”