Performance of new designed anchor impellers in stirred tanks

Kamla, Youcef; Ameur, Houari; Karas, Abdelkader; Arab, Mohammed Ilies

doi:10.1007/s11696-019-00902-x

Cited by 21 publications

(12 citation statements)

References 21 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%

“…The impeller is responsible for fluid mixing, promoting radial flow (from the central axis out to the sides of the tank and back again) and/or axial flow (up and down the height of the vessel) [178]. 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.…”

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

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“…The dimensionless numbers appearing in the equations (3)(4)(5)(6) are the Reynolds and Prandtl number:…”

Section: Mathematical Modelmentioning

confidence: 99%

“…They found that the agitator DTBT gives a good reduction of the vortex size of the impeller angles. Kamla et al [4] investigate the effects of the anchor geometry, the number of blades, and their inclination inside a stirred tank for low Reynolds numbers varying from 0.1 to 60. They demonstrate that the lowest power consumption is achieved with the circular shape of blades.…”

Section: Introductionmentioning

confidence: 99%

Effect of the wavy tank wall on the characteristics of mechanical agitation in the presence of a Al2O3-water nanofluid

et al. 2021

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The enhancement of the heat transfer in the stirred tank is a much-desired objective for accelerating certain physical and chemical parameters in the industrial field. From this basis, an attempt is made in this paper to investigate the effect of the wavy wall of a stirred tank on the hydrodynamic, thermal, and energetic behavior of an Al2O3-Water nanofluid. The stirred tank has a flat bottom, and it is equipped with an anchor stirrer. A hot temperature has been imposed on the tank wall, and the agitator has been assumed adiabatic, where the nanofluid has a cold temperature at the initial instant. The laminar flow was governed by the equations that describe the forced convection, and it was solved by the finite element method. The numerical simulation results showed a considerable acceleration in the heat transfer inside the stirred tank by increasing the amplitude of the wavy wall and increasing the nanoparticle concentration. However, there has been a remarkable increase in the stirring power number. This contribution aims to increase thermal efficiency, especially in the chemical and petrochemical fields, to obtain a better yield of certain chemical reactions and mass transfer depending on the heat.

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“…The increased height of curved blades may generate a stronger tangential flow and enhance the axial movement of fluid particles, as reported by these authors. Other researchers were interested in the effect of vessel shape and some impeller geometrical parameters on the power consumption for stirring viscous fluids [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Performance of V-cut Turbines for Stirring Shear-thinning Fluids in a Cylindrical Vessel

Ameur¹

2020

Period. Polytech. Mech. Eng.

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The impeller design is the most crucial parameter to enhance the performance of stirred tanks. The cut in the impeller blade is a new technique to save the energy of impellers in mixing vessels without increasing the mixing time or reducing the product quality. In this paper, the new technique of cut is applied for a disc turbine rotating in an unbaffled cylindrical tank. Effects of the V-cut shape are highlighted. Non-Newtonian shear-thinning fluids are considered for the three flow regimes (laminar, transient, and turbulent). Effects of the number of blades on the flow patterns, pumping rate (Nq) and power consumption (Np) are explored. From the obtained results, a recirculation loop of flow is observed at the tip of each blade for impellers with less than three blades. These recirculation loops disappear with the increased number of blades. Under laminar flow conditions, the obtained results also revealed a decrease in power consumption and an increase in the discharge flow rate with the rise of Reynolds number. However, almost any changes were observed for these parameters (Np and Nq) under turbulent flow conditions.

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Performance of new designed anchor impellers in stirred tanks

Cited by 21 publications

References 21 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

Effect of the wavy tank wall on the characteristics of mechanical agitation in the presence of a Al2O3-water nanofluid

Investigation of the Performance of V-cut Turbines for Stirring Shear-thinning Fluids in a Cylindrical Vessel

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