Power consumption for an agitated vessel equipped with pitched blade turbine and short baffles

Major-Godlewska, Marta; Karcz, J.

doi:10.1007/s11696-017-0346-x

Cited by 22 publications

(19 citation statements)

References 14 publications

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“…Results based on Rushton and flat paddles, which are typical radical impellers, were also reported by Major‐Godlewska and Karcz . Using the same vertical tubular coil, Major‐Godlewska and Karcz further investigated the power consumption, gas holdup, and residence time of gas bubbles in a gas‐solid‐liquid system.…”

Section: Introductionmentioning

confidence: 63%

“…The gas holdup and power consumption characteristics of an agitated vessel equipped with a tubular vertical coil and an A315 axial impeller were reported by Major‐Godlewska and Karcz . Results based on Rushton and flat paddles, which are typical radical impellers, were also reported by Major‐Godlewska and Karcz . Using the same vertical tubular coil, Major‐Godlewska and Karcz further investigated the power consumption, gas holdup, and residence time of gas bubbles in a gas‐solid‐liquid system.…”

Section: Introductionmentioning

confidence: 84%

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Power consumption, gas holdup, and mass‐transfer coefficient of triple‐impeller configurations in a stirred vessel with vertical tubular coils

2016

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Three kinds of impeller combinations (3 × 4WHd, HB + 2 × 4WHd, 2 × HB + 4WHd) were used to investigate the effects of coil baffles on system power consumption, gas holdup, and mass transfer coefficient. The experiments were performed in a dish‐bottomed vessel with a diameter of 0.29 m. Results of the power consumption experiments show that at the same rotation speed and an increasing rate of gas flow, the power consumptions of 3 × 4WHd and 2 × HB + 4WHd with coil baffles are almost the same as that of a system with four planar baffles, but there is a clear power draw for the HB + 2 × 4WHd combination. At rotational speeds of 250–350 rpm, the largest power draws for the 2 × HB + 4WHd, HB + 2 × 4WHd, and 3 × 4WHd impeller combinations equipped with coil baffles are 27, 25, and 15 %, respectively. The gas holdup experiment shows that with installation of coil baffles in the vessel, axial and radial impeller combinations can achieve gas dispersion identical to that attained with planar baffles. At the same power input and superficial gas rate over a wide range of gas velocities, the kLa values of the coil baffles for the 3 × 4WHd and 2 × HB + 4WHd combinations are almost identical to those of a conventional system with four baffles. However, in the HB + 2 × 4WHd system, kLa values of the coil baffles are 15 % higher than for planar baffles at low gas velocities and 30 % higher at high superficial gas rates. Finally, all data from the experiments on gas holdup and kLa values may be correlated through the equations ϵ=α(Pg/V)β(Vs)γ and KL a=K1(PG/V)K2(VS)K3.

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Section: Introductionmentioning

confidence: 63%

Section: Introductionmentioning

confidence: 84%

Power consumption, gas holdup, and mass‐transfer coefficient of triple‐impeller configurations in a stirred vessel with vertical tubular coils

2016

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“…The authors concluded that the curvature of the blades had the most significant impact on power reduction and the efficiency of the mixing process. The energy consumption for an agitated vessel equipped with a pitched blade turbine and the performance impellers was the object of a detailed study in [8,9]. Due to their high-efficiency, the most high-speed turbine-type impellers are often used in industrial processes.…”

Section: Introductionmentioning

confidence: 99%

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

2020

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The mixing process is a widespread phenomenon, which plays an essential role among a large number of industrial processes. The effectiveness of mixing depends on the state of mixed phases, temperature, viscosity and density of liquids, mutual solubility of mixed fluids, type of stirrer, and, what is the most critical property, the shape of the impeller. In the present research, the objective was to investigate the Newtonian fluids flow motion as well as all essential parameters for the mechanically agitated vessel with a new impeller type. The velocity field, the power number, and the pumping capacity values were determined using computer simulation and experimental measurements. The basis for the assessment of the intensity degree and the efficiency of mixing had to do with the analysis of the distribution of velocity vectors and the power number. An experimental and numerical study was carried out for various stirred process parameters and for fluids whose viscosity ranged from low to very high in order to determine optimal conditions for the mixing process.

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“…Some studies have been achieved on the effect of baffle design, including those of Bittins and Zehner [14], Karcz and Major [15], Ammar et al [16] and Kamla et al [17] for different impellers [a propeller, a pitched blade turbine (PBT) and a Rushton turbine (RT)]. The influence of some geometrical parameters of baffles (length, width, number and the clearance between the tank bottom and the lower edge of baffles) has been the subject of some studies [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Effect of baffles shape on the flow patterns and power consumption in stirred vessels

Foukrach

Ameur

2019

SN Appl. Sci.

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Effects of the baffles shape on the fluid velocities, flow patterns and power consumption in vessels agitated by a six blade Rushton turbine are explored in this paper. The curvature of baffles, their length, position and width are the main parameters under investigation. The study is carried out by using the Computational Fluid Dynamics tool, for a range of Reynolds number in the turbulent flow regime from 10 4 to 10 5. The comparison between the straight and curved baffles revealed that the curved shape allows wider well stirred region and more powerful radial jet of fluid than the straight baffle. In addition, the increase in baffle curvature allows a reduction in power consumption. When partial baffles are inserted in the vessel, the lowest value of power number is obtained with baffles located at the upper part of vessel, followed by those located at the center and then at the lower part. Concerning the effect of baffle length, the baffles with partial length which are located at the center position in vessel require the lowest power consumption.

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Power consumption for an agitated vessel equipped with pitched blade turbine and short baffles

Cited by 22 publications

References 14 publications

Power consumption, gas holdup, and mass‐transfer coefficient of triple‐impeller configurations in a stirred vessel with vertical tubular coils

Power consumption, gas holdup, and mass‐transfer coefficient of triple‐impeller configurations in a stirred vessel with vertical tubular coils

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

Effect of baffles shape on the flow patterns and power consumption in stirred vessels

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