Effect of Impeller Design on Power Characteristics and Newtonian Fluids Mixing Efficiency in a Mechanically Agitated Vessel at Low Reynolds Numbers

Jaszczur, Marek; Młynarczykowska, A.; Demurtas, Luana

doi:10.3390/en13030640

Cited by 38 publications

(24 citation statements)

References 30 publications

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“…Mixing in industrial facilities is carried out typically in stirred tanks. These devices ensure the ideal mixing conditions needed for several industrial applications, like chemical reactions [135,136], biological process [137,138], dissolution [51,139], emulsification [140,141], homogenization [142,143], crystallization [144,145], heating and cooling processes [146,147]. In fact, stirred tanks are less prone to develop biofouling than the systems described above.…”

Section: Stirred Tanksmentioning

confidence: 99%

“…Different impeller designs, like blade inclination and geometrical modifications, cause different mixing performance and power consumption [143,160]. Jaszczur et al [142] proposed a new impeller shape with reduced power consumption for the same or better mixing level when compared to the Rushton turbine. Several singularities in STRs (e.g.…”

Section: Stirred Tanksmentioning

confidence: 99%

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Overview on the hydrodynamic conditions found in industrial systems and its impact in (bio)fouling formation

Fernandes

Gomes

Simões

et al. 2021

Chemical Engineering Journal

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Biofouling is the unwanted accumulation of deposits on surfaces, composed by organic and inorganic particles and (micro)organisms. Its occurrence in industrial equipment is responsible for several drawbacks related to operation and maintenance costs, reduction of process safety and product quality, and putative outbreaks of pathogens. The understanding on the role of operating conditions in biofouling development highlights the hydrodynamic conditions as key parameter. In general, (bio)fouling occurs in a higher extension when laminar flow conditions are used. However, the characteristics and resilience of biofouling are highly dependent on the hydrodynamic conditions under which it is developed, with turbulent conditions being associated to recalcitrant biodeposits. In industrial settings like heat exchangers, fluid distribution networks and stirred tanks, hydrodynamics plays a dual function, affecting the process effectiveness while favouring biofouling formation. This review summarizes the hydrodynamics played in conventional industrial settings and provides an overview on the relevance of hydrodynamic conditions in biofouling development as well as in the effectiveness of industrial processes.

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Section: Stirred Tanksmentioning

confidence: 99%

Section: Stirred Tanksmentioning

confidence: 99%

Overview on the hydrodynamic conditions found in industrial systems and its impact in (bio)fouling formation

Fernandes

Gomes

Simões

et al. 2021

Chemical Engineering Journal

View full text Add to dashboard Cite

show abstract

“…In order to promote mixing and enhance the floc formation process, some baffles should be installed to break water flow co-rotation with the impeller [54]. In modifying the flow pattern to suit a particular condition, it is advisable to perform the optimization of the impeller shape for a particular vessel geometry [61,62].…”

Section: Oscillatory Flow Vortex Pattern (Eg Oscillatory Reactor)mentioning

confidence: 99%

The Role of Micro Vortex in the Environmental and Biological Processes

Oyegbile¹,

Oyegbile²,

Akdogan³

2020

Vortex Dynamics Theories and Applications

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This work presents a short review of the theoretical developments in the application of vortex dynamics to the processing of environmental and biological systems. The mechanisms of complex fluid-particle interaction in vortex dominated and non-vortex dominated flows are briefly discussed from theoretical and practical perspectives. Micro vortex propagation, characteristics and their various applications in environmental process engineering are briefly discussed. Several existing and potential applications of vortex dynamics in turbulent flows are highlighted and as well as the knowledge gaps in the current understanding of turbulence phenomenon with respect to its applications in the processing of solid-liquid suspension and biological systems.

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“…Perforated and fractal blades proe an intense turbulence. Marek Jaszczur et al [20] determined the velocity field and power number through numerical simulation and experimental measurement of a Rushton turbine. Bliatsiou, C. et al [21] analyzed different impellers and noted that the radial impeller is suitable for use in low shear conditions.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study on the Power Consumption and Flow Field Characteristics of a Three-Blade Combined Agitator

et al. 2021

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The three-blade combined agitator consists of two propulsion blades of the same type (including planar propeller blades b, δ = 36.87°) and a curved blade (θ = 30°). Using numerical simulation methods, the power characteristics, flow field distribution, turbulence characteristics and dead zone percentage of two kinds of three-blade combined agitators (TBCAs) from laminar flow to turbulent flow in a mixing vessel were studied. Moreover, the torque measurement method was used to perform experimental verification. The results show that the predicted power curve is consistent with the experimental results. The fluid velocity near the propeller blades in the TBC-B type agitator (δ = 36.87°) is significantly high, and the maximum increase of the total velocity can reach 30.3%. The fluid flow velocity near the curved blades is increased, and the radial diffusion ability of the fluid at the bottom of the stirring vessel is enhanced. When mixing low-viscosity fluids, the TBC-B type agitator can increase the fluid velocity near the paddle area, with a maximum increase of 22.1%. The vertical combination of curved blades and planar propeller blades can effectively reduce the tangential velocity and increase the axial and radial velocities. When stirring high-viscosity fluids, the speed of the TBC-B type agitator in the near paddle area and far end of the blade is higher than that of the TBC-A type agitator. Under the same conditions, the TBC-B-type agitator exhibits superior fluid discharge performance and can be used in a wider range of viscosities. When Re = 44,910, the dead zone percentage of the TBC-A type agitator is 0.0216. The percentage of dead zones produced by the TBC-B-type agitator is smaller, and the mixing effect is superior to that of the TBC-A-type agitator.

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Effect of Impeller Design on Power Characteristics and Newtonian Fluids Mixing Efficiency in a Mechanically Agitated Vessel at Low Reynolds Numbers

Cited by 38 publications

References 30 publications

Overview on the hydrodynamic conditions found in industrial systems and its impact in (bio)fouling formation

Overview on the hydrodynamic conditions found in industrial systems and its impact in (bio)fouling formation

The Role of Micro Vortex in the Environmental and Biological Processes

Comparative Study on the Power Consumption and Flow Field Characteristics of a Three-Blade Combined Agitator

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