A direct calculation method of the Metzner-Otto constant by using computational fluid dynamics

Ramírez-Muńoz, J.; Guadarrama-Pérez, R.; Márquez-Baños, Valaur E.

doi:10.1016/j.ces.2017.09.023

Cited by 13 publications

(11 citation statements)

References 14 publications

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“…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%

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

et al. 2020

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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.

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“…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%

“…(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%

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

et al. 2020

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“…Generalmente, la relación NQ/NP puede utilizarse para comparar la eficiencia de diferentes impulsores (Ramírez-Muñoz et al, 2017).…”

Section: = 2 ∫unclassified

“…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

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

Mendoza¹,

Pamela²

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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.

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Rheological characteristics of filamentous cultivation broths and suitable model fluids

Bliatsiou

Schrinner

Waldherr

et al. 2020

Biochemical Engineering Journal

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A direct calculation method of the Metzner-Otto constant by using computational fluid dynamics

Cited by 13 publications

References 14 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

Rheological characteristics of filamentous cultivation broths and suitable model fluids

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