Draw Down of Light Particles in Stirred Tanks

Özcan‐Taşkın, Gül; McGrath, G.

doi:10.1205/026387601753191966

Cited by 28 publications

(17 citation statements)

References 2 publications

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“…Hemrajani 3 recommended the use of four full length narrow baffles with width B/T of 0.02. € Ozcan-Taşkin and McGrath 7 show that four full baffles out perform a single or two baffles, as did Karcz and Mackiewicz, 14 specifically for up-pumping impellers. Khazam and Kresta 5 developed a novel geometry specifically for drawdown with four surfaces only baffles, which increase surface turbulence.…”

Section: Introductionmentioning

confidence: 92%

“…Previous studies [3][4][5][6][7][8][9][10] have largely focused on finding an optimum geometry or set of conditions to achieve the most effective drawdown performance. This performance is generally measured by observation as the impeller speed to just drawdown the particles (N JD ), ensuring that none spend longer than four seconds on the vessel surface.…”

Section: Introductionmentioning

confidence: 99%

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Concentrated slurry formation via drawdown and incorporation of wettable solids in a mechanically agitated vessel

et al. 2018

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This article describes the effect of vessel configurations on the drawdown and incorporation of floating solids to prepare concentrated alumina slurries in stirred tanks. The impeller speed and power draw required to incorporate all dry powder within four seconds, N JI and P JI , are used to evaluate incorporation performance. The effect of impeller type is assessed, with pitched blade impellers proving to be the most effective across the full range of solid contents considered. At higher solids content the energy demand is shown to increase dramatically, with a 100-fold increase in energy required to add 1% w/w more solid at 50% by weight compared to 1% by weight. Analysis of impeller power numbers show this coincides with a transition from constant power number to a region where power number increases linearly with decreasing Reynolds number. Contrary to studies at low solids content, the presence of baffles is shown to inhibit drawdown.

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Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Concentrated slurry formation via drawdown and incorporation of wettable solids in a mechanically agitated vessel

et al. 2018

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“…One of the advantages of placing the impeller at a larger submergence is that air entrainment is reduced or eliminated. In most processes, (Özcan-Taskin and McGrath, 2001), prevention of air or vapour entrainment from the headspace may be required to ensure the desired product quantity and quality. Another advantage is that placing the impeller at larger values of S results in larger values of cloud depth.…”

Section: Fig 6 -(A) Effect Of Baffle Configuration On N Jd For the Pmentioning

confidence: 99%

A novel geometry for solids drawdown in stirred tanks

Khazam

Kresta

2009

Chemical Engineering Research and Design

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“…Some researchers performed EFD studies on floating solids suspension and its dependence on some geometric or physical variables in stirred tanks. But the systematic CFD studies can be hardly found in the open literature .…”

Section: Introductionmentioning

confidence: 99%

Computational fluid dynamics analysis to effects of geometrical design and physical property on complete suspension of floating solids in stirred tanks

Qiao

Wang

Ying

et al. 2014

Asia-Pacific J Chem Eng

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The computational fluid dynamics methodology was developed to qualitatively study effects of geometrical design and physical property on the mixing quality of floating solids in stirred tanks with an up-pumping pitched blade turbine. The multiple reference frame approach was used to model the relative motion between rotating impeller and stationary baffles. Two important mixing parameters, power number (N p ) and standard deviation (σ), were used to predict critical impeller speed (N CS ) for complete suspension of floating solids and compare the mixing efficiency. Predicted results were compared with the experiment results in the open literature and were explained with published mechanisms or theories concerning solid suspension. Reasonable agreements were achieved. Figure 15. Variations of σ for three ρ s with N (c = 30% v/v, d p = 2.5 mm, D = 0.4T, S = 1/3H).

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Draw Down of Light Particles in Stirred Tanks

Cited by 28 publications

References 2 publications

Concentrated slurry formation via drawdown and incorporation of wettable solids in a mechanically agitated vessel

Concentrated slurry formation via drawdown and incorporation of wettable solids in a mechanically agitated vessel

A novel geometry for solids drawdown in stirred tanks

Computational fluid dynamics analysis to effects of geometrical design and physical property on complete suspension of floating solids in stirred tanks

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