Effect of draft tube position on the hydrodynamics of a draft tube slurry bubble column

Pironti, F. F.; Medina, V.R.; Calvo, Ricardo N.; Sáez, A. Eduardo

doi:10.1016/0923-0467(95)03004-2

Cited by 16 publications

(16 citation statements)

References 10 publications

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“…Kojima et al (1999) observed an increase in the liquid circulation velocity with increasing draft tube height. Pironti et al (1995) observed an increase in circulation time (i.e., a decrease in liquid velocity) with increase in the draft tube clearance from the bottom. In these studies the ratio of tank height to diameter ratio was greater than 2 and the gas sparging location was at the bottom of the tank.…”

Section: Effect Of Draft Tube Height and Clearance From The Bottommentioning

confidence: 91%

Flow pattern visualization in a mimic anaerobic digester using CFD

Vesvikar

Al‐Dahhan²

2005

Biotech & Bioengineering

135

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Three-dimensional steady-state computational fluid dynamics (CFD) simulations were performed in mimic anaerobic digesters to visualize their flow pattern and obtain hydrodynamic parameters. The mixing in the digester was provided by sparging gas at three different flow rates. The gas phase was simulated with air and the liquid phase with water. The CFD results were first evaluated using experimental data obtained by computer automated radioactive particle tracking (CARPT). The simulation results in terms of overall flow pattern, location of circulation cells and stagnant regions, trends of liquid velocity profiles, and volume of dead zones agree reasonably well with the experimental data. CFD simulations were also performed on different digester configurations. The effects of changing draft tube size, clearance, and shape of the tank bottoms were calculated to evaluate the effect of digester design on its flow pattern. Changing the draft tube clearance and height had no influence on the flow pattern or dead regions volume. However, increasing the draft tube diameter or incorporating a conical bottom design helped in reducing the volume of the dead zones as compared to a flat-bottom digester. The simulations showed that the gas flow rate sparged by a single point (0.5 cm diameter) sparger does not have an appreciable effect on the flow pattern of the digesters at the range of gas flow rates used.

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Section: Effect Of Draft Tube Height and Clearance From The Bottommentioning

confidence: 91%

Flow pattern visualization in a mimic anaerobic digester using CFD

Vesvikar

Al‐Dahhan²

2005

Biotech & Bioengineering

135

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“…Wang et al (2006a) developed an EulerianEulerian three-phase fluid model to predict the dispersion of two dispersed phases in the agitated liquid-liquid-solid system, and successfully simulate the distribution of the dispersed oil phase under high agitation rate, but unsuccessfully under low impeller speed. Padial et al (2000) used a finite-volume flow technique to simulate the three-phase flow in conical-bottom draft-tube bubble columns presenting consistent predictions of the gas volume fraction and circulation times in the column with the experimental observation of Pironti et al (1995).…”

Section: Introductionmentioning

confidence: 88%

Experimental investigation and CFD simulation of liquid–solid–solid dispersion in a stirred reactor

Wang

Zhang

et al. 2010

Chemical Engineering Science

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“…In the design of airlift reactors, the geometry of the system plays an important role in its efficiency for mixing and mass transfer [9].The effects of geometric parameters have been considered by many researchers. Koide et al [10] analyzed the effects of the ratio of the internal diameter of the draft tube to the column diameter (D T /D) on the hydrodynamics of air-water systems.…”

Section: Introductionmentioning

confidence: 99%

CFD simulation of the hydrodynamics in an internal air-lift reactor with two different configurations

Ebrahimifakhar

Mohsenzadeh

Moradi

et al. 2011

Front. Chem. Sci. Eng.

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Computational fluid dynamics (CFD) was used to investigate the hydrodynamic parameters of two internal airlift bioreactors with different configurations. Both had a riser diameter of 0.1 m. The model was used to predict the effect of the reactor geometry on the reactor hydrodynamics. Water was utilized as the continuous phase and air in the form of bubbles was applied as the dispersed phase. A two-phase flow model provided by the bubbly flow application mode was employed in this project. In the liquid phase, the turbulence can be described using the k-ε model. Simulated gas holdup and liquid circulation velocity results were compared with experimental data. The predictions of the simulation are in good agreement with the experimental data.

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Effect of draft tube position on the hydrodynamics of a draft tube slurry bubble column

Cited by 16 publications

References 10 publications

Flow pattern visualization in a mimic anaerobic digester using CFD

Flow pattern visualization in a mimic anaerobic digester using CFD

Experimental investigation and CFD simulation of liquid–solid–solid dispersion in a stirred reactor

CFD simulation of the hydrodynamics in an internal air-lift reactor with two different configurations

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