Mixing in a Fluid Jet Agitated Tank: Geometric Effects

Zughbi, Habib; Siddiqui, Shad W.; Fatehi, A.I.

doi:10.1002/apj.5500140112

Cited by 6 publications

(5 citation statements)

References 8 publications

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“…It should be taken into account that both the impeller design and tank geometry determine the mixing time 25, 26. Furthermore, the mixing time is a function of the circulation time.…”

Section: Resultscontrasting

confidence: 87%

“…Furthermore, the mixing time is a function of the circulation time. Zughbi et al 25 reported that the mixing time in a tank with a hemispherical bottom is 25% smaller than the mixing time obtained with a flat‐bottom tank of the same volume. This fact explains why the product N · t c reported in the present work is smaller than the previous values reported by Tanguy et al 2…”

Section: Resultsmentioning

confidence: 99%

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CFD investigation of new helical ribbon mixers bottom shapes to improve pumping

Sanjuan-Galindo

Heniche

Ascanio

et al. 2011

Asia-Pacific J Chem Eng

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It is well known that helical ribbon (HR) impellers exhibit poor bottom pumping properties. Three different HR impeller geometries, varying in their bottom design, are compared in terms of their mixing performance. Particular emphasis is given to the improvement of pumping capabilities. The selected bottom geometries were a standard bottom termination, an anchor-type termination and a paddle-type termination. The investigation was based on the use of 3D finite-element simulation to assess the hydrodynamics and mixing performance using various distributive and dispersive criteria. Analysis of Poincaré maps showed that an HR with a paddle-type termination operating in a down-pumping mode offered the best performance. 

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“…It should be taken into account that both the impeller design and tank geometry determine the mixing time 25, 26. Furthermore, the mixing time is a function of the circulation time.…”

Section: Resultscontrasting

confidence: 87%

Section: Resultsmentioning

confidence: 99%

CFD investigation of new helical ribbon mixers bottom shapes to improve pumping

Sanjuan-Galindo

Heniche

Ascanio

et al. 2011

Asia-Pacific J Chem Eng

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“…Different parameters will affect the flow pattern inside the vessel and the efficiency and mixing time. The design of the vessel bottom can affect its performance as flat bottom vessels require more mixing time [9] and higher impeller speeds [10] than for the dished and conical bottoms. Moreover, conical bottom vessels have the advantage of absence of stagnation point associated with sharp corners [11] and assure complete drainage of the solution and suspended matters.…”

Section: Mass Transfermentioning

confidence: 99%

The use of neural network to estimate mass transfer coefficient from the bottom of agitated vessel

El-Shazly

2014

Heat Mass Transfer

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In this study, the ability of the artificial neural network (ANN) to estimate the rate of mass transfer coefficient was compared against the mass transfer correlation obtained by dimensional analysis in terms of Sherwood, Schmidt and Reynolds numbers. The results showed that the ANN is better than the conventional mass transfer correlation in most cases and the best results are obtained at 3-7 neurons in the hidden layer.

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“…Zughbi Habib11 conducted experiments with a symmetrical jet and an asymmetrical jet arrangement around a tank and found that jet Reynolds number determines the degree of mixing in the tank. Zughbi12 carried out e xperiments and simulations in a jet mixing tank with capacity 23 L and investigated the effect of alternative shapes of the tank bottom. A hemispherical base and conical base gave less mixing time than a flat base, increase in the Reynolds number resulted in a decrease in mixing time.…”

Section: Introductionmentioning

confidence: 99%

Development of mixing time correlation for a double jet mixer

Manjula

Kalaichelvi

Dheenathayalan

2009

J of Chemical Tech & Biotech

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BACKGROUND: Jet mixing is one of the simplest methods to achieve mixing. There have been a number of experimental studies concerned with jet mixing; some of these studies report empirical correlations. The existing correlations are not useful where there are significant deviations from the idealized conditions. Most correlations reported in the literature deal with liquid flow with single or multiple jets, whereas the effect of radial angle on mixing time was not studied. This present study investigates the effect of operating parameters on experimental mixing time in a double jet mixer. Nozzle configuration for jet1 was fixed based on earlier studies (2/3rd position, nozzle angle 45• and nozzle diameter 10 mm). Mixing times were estimated for different jet2 configurations of jet angle (30• , 45• and 60 • ), radial angles (60 • , 120• , 180 • ), jet diameter (5 mm and 3 mm) and located at different tank heights (2/3rd and 1/3rd from the bottom of the tank).

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Mixing in a Fluid Jet Agitated Tank: Geometric Effects

Cited by 6 publications

References 8 publications

CFD investigation of new helical ribbon mixers bottom shapes to improve pumping

CFD investigation of new helical ribbon mixers bottom shapes to improve pumping

The use of neural network to estimate mass transfer coefficient from the bottom of agitated vessel

Development of mixing time correlation for a double jet mixer

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