The characteristics of aerated 12- and 18-blade Rushton turbines at transitional Reynolds numbers

Nienow, Alvin W.; Kendall, A. D.; Moore, I. P. T.; Özcan-Taşkın, N. Gül; Badham, R. S.

doi:10.1016/0009-2509(94)00250-u

Cited by 15 publications

(7 citation statements)

References 9 publications

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“…The standard Rushton turbine design with a discblade intercepting angle of 90° was used to validate the accuracy of the system. The power number of the Rushton turbine found in this work was 5.47, which is in close agreement with those published in the literature (Bates et al, 1963;Houcine et al, 2000;Nienow et al, 1995;Wu et al, 2001). In the turbulent region with the Reynolds number ranging from 2×10 4 to 6.6×10 4 , the power number of all impellers showed insignificant variations with increasing Reynolds number (Figure 3).…”

Section: Power Numbersupporting

confidence: 90%

Effect of Disc-Blade Intercepting Angle on Mixing Performance in a Multiphase Stirred Vessel

Huiwen.

Ghotli

Shah

et al. 2019

Braz. J. Chem. Eng.

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Section: Power Numbersupporting

confidence: 90%

Effect of Disc-Blade Intercepting Angle on Mixing Performance in a Multiphase Stirred Vessel

Huiwen.

Ghotli

Shah

et al. 2019

Braz. J. Chem. Eng.

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“…Among radial impellers, the Scaba impeller has shown some promising characteristics in both single and multiphase systems as well as coaxial systems 17 . Nienow et al 18 stated that the gas handling capacity of the Scaba impeller was superior to the Rushton turbine in a system containing a non‐Newtonian liquid. In another study, Amanullah et al 19 showed the inferiority of the Rushton turbine compared to the Scaba impeller in Xanthan gum fermentation.…”

Section: Introductionmentioning

confidence: 99%

Local and overall gas holdup in an aerated coaxial mixing system containing a non‐Newtonian fluid

2020

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Gas dispersion in non-Newtonian fluids is a challenging task due to the formation of large cavities behind the impeller blades, which leads to the generation of very large bubbles. In this study, the effects of impeller speed, impeller type, pumping direction, and CMC concentration on the local and overall gas holdup inside a coaxial mixing tank comprised of two central impellers and an anchor were investigated through tomography, computational fluid dynamics (CFD), and response surface methodology (RSM). The results showed that an increase in the fluid apparent viscosity resulted in decreasing the gas holdup except for the pitched blade impeller in upward-pumping mode. Although the highest overall gas holdup was accomplished for the downward pumping and co-rotating mode, the local gas holdup data revealed a non-uniform distribution of gas by this configuration. The lowest gas dispersion efficiency was achieved by a system comprised of two Scaba impellers and an anchor.

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“…A few studies investigate the effect of number of impeller blades on power consumption in batch stirred vessels and show the power consumption to go up with increasing number of blades (Bates et al, 1963;Nienow et al, 1995). This could be explained in terms of the increase in total drag acting on impeller with increase in number of blades.…”

Section: Introductionmentioning

confidence: 99%

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

Singh

Mahajani

Shenoy

et al. 2007

Chemical Engineering Science

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The present work involves single-phase computational fluid dynamics (CFD) simulations of continuous flow pump-mixer employing topshrouded Rushton turbines with trapezoidal blades. Baffle-impeller interaction has been modeled using sliding mesh and multiple reference frame approaches. Standard k-model has been used for turbulence modeling. Several CFD runs representing different combinations of geometric and process parameters have been carried out. Results of CFD simulations have been used to find out two macroscopic performance parameters of pump-mixer-power consumption and head generated by the impeller. The simulation results have been compared with the experimental data obtained on a pilot-scale setup. Good agreement between CFD predictions and experimental results is observed. In most cases, sliding mesh approach is found to perform better than multiple reference frame approach. Details from CFD simulations have been used to have an insight into the pumping action of the impeller.

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The characteristics of aerated 12- and 18-blade Rushton turbines at transitional Reynolds numbers

Cited by 15 publications

References 9 publications

Effect of Disc-Blade Intercepting Angle on Mixing Performance in a Multiphase Stirred Vessel

Effect of Disc-Blade Intercepting Angle on Mixing Performance in a Multiphase Stirred Vessel

Local and overall gas holdup in an aerated coaxial mixing system containing a non‐Newtonian fluid

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

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