Effects of vessel baffling on the drawdown of floating solids

Karcz, J.; Mackiewicz, B.

doi:10.2478/s11696-009-0011-0

Cited by 22 publications

(20 citation statements)

References 8 publications

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“…Karcz and Mackiewicz compared the baffling effects with different impellers and immersion depths. They found that baffling of the vessel affects the stage of floating particles which is more visible at positions with a deeper immersion depth, and floating particles are better dispersed with a lower number of short baffles than those with standard baffles . Khazam and Kresta found that performance of half‐depth baffles is very similar to that of full‐depth baffles.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the mixing and dispersing of floating particles in viscous system

et al. 2016

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The effects of baffle configuration, impeller type, impeller diameter ratio, and immersion depth on the critical drawdown speed and power of floating particles were investigated by experiment, and the advantageous stirred vessel was determined on the basis of the low energy consumption principle. Furthermore, the effects of system viscosity, mean solid concentration, and particle size on the dispersing characteristic of floating particles were also researched with the advantageous stirred vessel. The results show that, (1) when the stirred vessel is equipped with a single baffle, the critical drawdown speed and power of floating particles are lower than those of others. (2) Among the propeller, six flat‐blade disc turbine (Rushton), and six 45° pitched‐blade turbine (PBT‐6), the Rushton turbine has the lowest critical drawdown speed, and the down‐pumping propeller (TXL) has the lowest critical drawdown power. (3) The critical drawdown speed and power are lower with a larger impeller diameter and a smaller immersion depth. (4) The critical drawdown speed and power increase with increasing system viscosity, mean solid concentration, and particle size. The experimental results provide useful guidelines for the advantageous design of the stirred vessel used for the dispersing of floating particles in a viscous system.

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Section: Introductionmentioning

confidence: 99%

Experimental study on the mixing and dispersing of floating particles in viscous system

et al. 2016

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“…Shorter baffles of the length L < H may also be recommended for the same applications, for example, for the optimization of the heat transfer process (Karcz and Stręk 1995), as well as for the dispersion of gas bubbles (Hsu et al 1998) or the suspension of the heavy (Heywood et al 1991; Karcz and Więch 1999) or floating (Karcz and Mackiewicz 2009) particles into agitated liquid.…”

Section: Introductionmentioning

confidence: 99%

“…Heywood et al (1991) concluded that at p = 0.55 H , the Rushton turbine requires one-fifth of the power consumption to attain complete suspension, in comparison with the standard configuration of baffles. Karcz and Mackiewicz (2009) experimentally studied effects of vessel baffling on the drawdown of floating solids. The measurements were taken in the agitated vessel ( D = H = 0.3 m) with the high-speed impeller located at the height h = 0.33 H or h = 0.67 H and short baffles.…”

Section: Introductionmentioning

confidence: 99%

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

Major-Godlewska

Karcz

2017

Chem. Pap.

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Power characteristics for an agitated vessel equipped with planar short baffles of length L and pitched blade turbine of pitch β are presented in the paper. The studies were carried out in the vessel of inner diameter D = 0.6 m, where the baffles were located in the distance p from the vessel bottom (p + L = H). Torque was measured using strain gauge method within the turbulent regime of the flow of Newtonian liquid in the agitated vessel. The effects of the pitch β and geometrical parameter p/H on the power number Ne were determined mathematically. The results showed that, for the assumed value of the angle β, the function Ne = f (L/H) decreases with the decrease in the baffle length L (i.e. with the increase in the parameter p). Moreover, for the assumed value of the baffle length L, the function Ne = f (β) increases with the increase in the angle β of the inclination of the impeller blade.

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“…4. Einfluss der Rü hrereinbauhö he sowie Abstand der Rü hrerebenen auf die Newton-Zahl des 1-, 2-und 3-stufigen 4 x 45°-Schrä gblattrü hrers.…”

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Influence of Different Baffle Variations on the Effectiveness of Multi‐Stage Agitated Vessels

Heyter

Wollny

2017

Chemie Ingenieur Technik

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Die Ermittlung der Leistungskennzahl als Auslegungsparameter für mehrstufige Rührsysteme ist stark von den geometrischen Randbedingungen abhängig. Insbesondere bei axial fördernden Rührern ist aufgrund ihrer Interaktion der Abstand der Rührerebenen zueinander von Bedeutung. Des Weiteren zeigen unterschiedliche Bewehrungszustände eine Auswirkung auf den resultierenden Leistungseintrag. In der vorliegenden Arbeit wird ein mehrstufiges axiales Rührsystem systematisch untersucht. Unter Variation der Bewehrung erfolgt eine Charakterisierung hinsichtlich des Leistungseintrages sowie des Homogenisierverhaltens.

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Effects of vessel baffling on the drawdown of floating solids

Cited by 22 publications

References 8 publications

Experimental study on the mixing and dispersing of floating particles in viscous system

Experimental study on the mixing and dispersing of floating particles in viscous system

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

Influence of Different Baffle Variations on the Effectiveness of Multi‐Stage Agitated Vessels

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