Effect of particle content on agitator speed for off-bottom suspension

“…The values of coefficients C and γ depend on particle volumetric concentration c. The following empirical equations were proposed by Rieger (2000) to describe these dependencies…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Effect of Impeller Shape on Solid Particle Suspension

Rieger

Jirout

Ceres

et al. 2013

Chemical and Process Engineering

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This paper deals with the effect of impeller shape on off-bottom particle suspension. On the basis of numerous suspension measurements, correlations are proposed for calculating the just-suspended impeller speed for a standard pitched four-blade turbine and three types of hydrofoil impellers produced by TECHMIX for several particle sizes and for a wide range of particle concentrations.The suspension efficiency of the tested impellers is compared with the efficiency of a standard pitched blade turbine on the basis of the power consumption required for off-bottom suspension of solid particles. It is shown that the standard pitched blade turbine needs highest power consumption, i.e. it exhibits less efficiency for particle suspension than hydrofoil impellers produced by TECHMIX.

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“…Possible dimensionless parameters for such a correlation are taken from previous work on theories for stirred vessels in the just suspended condition (Musil and Vlk, 1978;Wichterle, 1988;Rieger and Ditl, 1994;Rieger, 2000;Murugesan, 2001;Rieger, 2002). Such theories often predict that the suspension of particles in stirred vessels depends on certain dimensionless numbers, such as the Froude number (Fr'), the modified Froude number (Fr*), the Archimedes number (Ar), the Reynolds number (Re), the particle Reynolds number, as well …”

Section: A Mathematical Model For Particles Suspensionmentioning

confidence: 99%

“…Improved correlations have been presented which combine experimental evidence with various theories for stirred vessels in the just suspended condition (Musil and Vlk, 1978;Wichterle, 1988;Rieger and Ditl, 1994;Rieger, 2000;Murugesan, 2001;Rieger, 2002).…”

Section: Introductionmentioning

confidence: 99%

A new aproach to characterize suspensions in stirred vessels based on computational fluid dynamics

Cekinski

Giulietti

Seckler

2010

Braz. J. Chem. Eng.

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-Fluid dynamics simulations were applied for evaluating the suspension of particles in stirred vessels. The spatial distribution of particles throughout the vessel was characterized by a single parameter, here called the suspension quality (σ). Based on simulation results, a semi-empirical correlation was developed that correlated the suspension quality with the vessel geometry and solid and fluid properties, including a large variety of conditions, such as vessel and impeller diameters, impeller clearances, rotational speeds, particle densities and sizes. Comparison of the model with experimental data from the literature (Bohnet and Niesmak, 1980) suggests that the model can be extended to systems with different impeller geometries by adjustment of one single empirical parameter. The model can be used in the design of stirred vessels for the identification of the rotation speeds necessary to promote a specified suspension quality.

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Effect of particle content on agitator speed for off-bottom suspension

Cited by 13 publications

References 3 publications

Solid particle distribution of moderately concentrated suspensions in a pilot plant stirred vessel

Solid particle distribution of moderately concentrated suspensions in a pilot plant stirred vessel

Effect of Impeller Shape on Solid Particle Suspension

A new aproach to characterize suspensions in stirred vessels based on computational fluid dynamics

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