Shear rate and direct numerical calculation of the Metzner-Otto constant for a pitched blade turbine

Márquez-Baños, Valaur E.; Concha-Gómez, Aarón D. De La; Valencia-López, José J.; López-Yáñez, Adrián; Ramírez-Muńoz, J.

doi:10.1016/j.jfoodeng.2019.03.021

Cited by 16 publications

(13 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It turns out that this fact is in agreement with that reported by Metzner and Otto , Paul et al , Torrez and André , Ramírez‐Muñoz et al. , and Marquez‐Baños et al .…”

Section: Resultssupporting

confidence: 92%

“…where the slope K s is the Metzner-Otto constant. It has been reported that K s is a characteristic constant for a given type of impeller and is considered independent from the fluid's rheological properties and geometric parameters [2,17,22,23]. By substituting Eq.…”

Section: Experimental and Numerical Calculation Of The Metzner-otto Cmentioning

confidence: 99%

“…(13)). Details of this method are described in two previous studies published by this research group [23,25]. Figs.…”

Section: Experimental and Numerical Calculation Of K Smentioning

confidence: 99%

See 2 more Smart Citations

Hydrodynamic Performance of a Ring‐Style High‐Shear Impeller in Newtonian and Shear‐Thinning Fluids

et al. 2020

Self Cite

View full text Add to dashboard Cite

Laminar mixing of Newtonian and shear-thinning fluids induced by a Hockmeyer-type impeller was investigated. Two unbaffled tanks at three impellers off-bottom clearances (c) were studied. Six geometric combinations, i.e., two d/T and three c/T, were examined where d and T are the impeller and tank diameters, respectively. Determination of the Metzner-Otto constant (K s) was undertaken. The effects of d/T, c/T, and fluid rheology on K s , power demand, pumping, shear and viscous dissipation were analyzed. The evaluated geometric ratios and rheology do not significantly affect K s and power demand, only the rheology had an impact on the remaining hydrodynamic parameters. Pumping was favored with the Newtonian fluid, and shear and viscous dissipation increased with the shearthinning fluid.

show abstract

“…It turns out that this fact is in agreement with that reported by Metzner and Otto , Paul et al , Torrez and André , Ramírez‐Muñoz et al. , and Marquez‐Baños et al .…”

Section: Resultssupporting

confidence: 92%

Section: Experimental and Numerical Calculation Of The Metzner-otto Cmentioning

confidence: 99%

See 1 more Smart Citation

Hydrodynamic Performance of a Ring‐Style High‐Shear Impeller in Newtonian and Shear‐Thinning Fluids

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…En la literatura es una práctica común evaluar la eficiencia de mezclado de diferentes tipos de impulsores comparando parámetros de macro mezclado como número de bombeo, número de potencia, o la relación entre ellos (Nienow, 1996;Cheng et al, 2013;Ramírez-Muñoz et al, 2017;Márquez-Baños et al, 2019).…”

Section: Antecedentesunclassified

“…Para determinar la malla que es independiente del número de elementos, se realizaron simulaciones numéricas para estas cuatro mallas usando el fluido newtoniano al mayor número de Reynolds evaluado en este estudio (Re=66,000). A partir de los resultados de las simulaciones de las cuatro mallas se extrajeron los valores de potencia y de la tasa de corte local y promedio en los diferentes volúmenes, siguiendo los criterios definidos en trabajos de la literatura (Ramírez-Gómez et al, 2015;Ramírez-Muñoz et al, 2017;Márquez-Baños et al, 2019).…”

Section: Análisis De Independencia De Mallaunclassified

Estudio hidrodinámico de tanques agitados para la producción de recubrimiento blanco base agua

Mendoza¹,

Pamela²

View full text Add to dashboard Cite

In the present work, a university-industry linkage project was carried out in which the hydrodynamic performance of three existing impellers in agitated tanks in a Paint manufacturing plant of the company Axalta Coating Systems is compared. These are 45 ° inclined four vane impeller (PBT4), 35 ° inclined six vane impeller (PBT6), and Chemineer type curved tip three inclined vane high efficient impeller (HE3). For this, Computational Fluid Dynamics and experimental measurements of power consumption were used. The study was carried out in a 4-liter cylindrical tank operating in a turbulent regime (Reynolds numbers greater than 14,000) using two types of fluids; water and white coating like Newtonian fluid and slimming fluid. In all the simulations and experimental validations, geometric similarity was maintained with the existing conditions in the plant. An analysis of mesh independence was carried out, comparing meshes with an increase of twice the number of elements, in which the one with the least variability of the hydrodynamic properties with respect to the previous one was chosen. Once the independent mesh was obtained, the speed fields, the dependence of the power numbers (NP) and pumping numbers (NQ) of each of the impellers under study were obtained at different operating conditions similar to those existing in the plant. It was found that in turbulent regime for both Newtonian and non-Newtonian fluid, the power number is higher for the PBT4 impeller and the lower for the PBT6. For both fluids, the pumping number was higher for the PBT4 impeller and the lowest was obtained for the PBT6. The mixing effectiveness ratio (NQ/NP) that was found is that Chemineer's HE3 impeller has the highest value for Newtonian fluid, while for non-Newtonian fluid, the values are very similar for PBT4 and HE3 impellers. For the specific case study of this work, it was concluded that for the homogenization of a white coating manufactured in the company Axalta Coating Systems using the PBT4 and HE3 impellers they would have a very similar performance, while the PBT6 impeller would have the worst performance. Considering that the PBT4 impeller is a general purpose agitator and can be used in a large number of applications, and furthermore, it is easier to manufacture and its cost is lower, the PBT4 agitator would have a better performance than the HE3 impeller.

show abstract

Rheology and Hydrodynamics of Iron Ore Mineral Pulps during a Bioleaching Process in a Continuous Stirred‐Tank Reactor

et al. 2023

View full text Add to dashboard Cite

The rheological response and the computational hydrodynamic continuous stirred‐tank behavior were analyzed to increase the understanding of the bioleaching process in mineral pulps. The rheological properties of the mineral pulps showed that a smaller particle size increases the magnitude of the rheological parameters, shortens the bioleaching process time, and, indirectly, increases the concentration of bacteria in the medium, thus augmenting the gel strength. The bioreactor hydrodynamics results revealed that the best dual‐impeller configuration corresponds to a Rushton (top)/Maxflo (bottom) configuration, generating power savings of ∼9 %. Finally, when analyzing apparent viscosity maps, velocity fields, and streamlines at different stirring speeds, enhanced hydrodynamic conditions were observed at 400 rpm.

show abstract

Shear rate and direct numerical calculation of the Metzner-Otto constant for a pitched blade turbine

Cited by 16 publications

References 37 publications

Hydrodynamic Performance of a Ring‐Style High‐Shear Impeller in Newtonian and Shear‐Thinning Fluids

Hydrodynamic Performance of a Ring‐Style High‐Shear Impeller in Newtonian and Shear‐Thinning Fluids

Estudio hidrodinámico de tanques agitados para la producción de recubrimiento blanco base agua

Rheology and Hydrodynamics of Iron Ore Mineral Pulps during a Bioleaching Process in a Continuous Stirred‐Tank Reactor

Contact Info

Product

Resources

About