CFD simulation of solids suspension in stirred tanks

Aoyi Ochieng, Maurice S. Onyango

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Many chemical reactions are carried out using stirred tanks, and the efficiency of such systems depends on the quality of mixing, which has been a subject of research for
many years. For solid–liquid mixing, traditionally the research efforts were geared towards determining mixing features such as off-bottom solid suspension using experimental techniques. In a few studies that focused on the determination of solids concentration distribution, some methods that have been used have not been accurate enough
to account for some small scale flow mal-distribution such as the existence of dead zones. The present review shows that computational fluid dynamic (CFD) techniques can be used to simulate mixing features such as solids off-bottom suspension, solids
concentration and particle size distribution and cloud height. Information on the effects
of particle size and particle size distribution on the solids concentration distribution is still scarce. Advancement of the CFD modeling is towards coupling the physical and kinetic data to capture mixing and reaction at meso- and micro-scales. Solids residence time distribution is important for the design, however, the current CFD
models do not predict this parameter. Some advances have been made in recent years to apply CFD simulation to systems that involve fermentation and anaerobic processes. In these systems, complex interaction between the biochemical process and the
hydrodynamics is still not well understood. This is one of the areas that still need more attention.
Original languageEnglish
Number of pages10
JournalHemijska Industrija
Volume64
Issue number5
DOIs
Publication statusPublished - 2010

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Suspensions
Computational fluid dynamics
Computer simulation
Particle size analysis
Residence time distribution
Fermentation
Chemical reactions
Particle size
Kinetics

Cite this

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title = "CFD simulation of solids suspension in stirred tanks",
abstract = "Many chemical reactions are carried out using stirred tanks, and the efficiency of such systems depends on the quality of mixing, which has been a subject of research formany years. For solid–liquid mixing, traditionally the research efforts were geared towards determining mixing features such as off-bottom solid suspension using experimental techniques. In a few studies that focused on the determination of solids concentration distribution, some methods that have been used have not been accurate enoughto account for some small scale flow mal-distribution such as the existence of dead zones. The present review shows that computational fluid dynamic (CFD) techniques can be used to simulate mixing features such as solids off-bottom suspension, solidsconcentration and particle size distribution and cloud height. Information on the effectsof particle size and particle size distribution on the solids concentration distribution is still scarce. Advancement of the CFD modeling is towards coupling the physical and kinetic data to capture mixing and reaction at meso- and micro-scales. Solids residence time distribution is important for the design, however, the current CFDmodels do not predict this parameter. Some advances have been made in recent years to apply CFD simulation to systems that involve fermentation and anaerobic processes. In these systems, complex interaction between the biochemical process and thehydrodynamics is still not well understood. This is one of the areas that still need more attention.",
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CFD simulation of solids suspension in stirred tanks. / Ochieng, Aoyi; Onyango, Maurice S.

In: Hemijska Industrija, Vol. 64, No. 5, 2010.

Research output: Contribution to journalArticle

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T1 - CFD simulation of solids suspension in stirred tanks

AU - Ochieng, Aoyi

AU - Onyango, Maurice S.

PY - 2010

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N2 - Many chemical reactions are carried out using stirred tanks, and the efficiency of such systems depends on the quality of mixing, which has been a subject of research formany years. For solid–liquid mixing, traditionally the research efforts were geared towards determining mixing features such as off-bottom solid suspension using experimental techniques. In a few studies that focused on the determination of solids concentration distribution, some methods that have been used have not been accurate enoughto account for some small scale flow mal-distribution such as the existence of dead zones. The present review shows that computational fluid dynamic (CFD) techniques can be used to simulate mixing features such as solids off-bottom suspension, solidsconcentration and particle size distribution and cloud height. Information on the effectsof particle size and particle size distribution on the solids concentration distribution is still scarce. Advancement of the CFD modeling is towards coupling the physical and kinetic data to capture mixing and reaction at meso- and micro-scales. Solids residence time distribution is important for the design, however, the current CFDmodels do not predict this parameter. Some advances have been made in recent years to apply CFD simulation to systems that involve fermentation and anaerobic processes. In these systems, complex interaction between the biochemical process and thehydrodynamics is still not well understood. This is one of the areas that still need more attention.

AB - Many chemical reactions are carried out using stirred tanks, and the efficiency of such systems depends on the quality of mixing, which has been a subject of research formany years. For solid–liquid mixing, traditionally the research efforts were geared towards determining mixing features such as off-bottom solid suspension using experimental techniques. In a few studies that focused on the determination of solids concentration distribution, some methods that have been used have not been accurate enoughto account for some small scale flow mal-distribution such as the existence of dead zones. The present review shows that computational fluid dynamic (CFD) techniques can be used to simulate mixing features such as solids off-bottom suspension, solidsconcentration and particle size distribution and cloud height. Information on the effectsof particle size and particle size distribution on the solids concentration distribution is still scarce. Advancement of the CFD modeling is towards coupling the physical and kinetic data to capture mixing and reaction at meso- and micro-scales. Solids residence time distribution is important for the design, however, the current CFDmodels do not predict this parameter. Some advances have been made in recent years to apply CFD simulation to systems that involve fermentation and anaerobic processes. In these systems, complex interaction between the biochemical process and thehydrodynamics is still not well understood. This is one of the areas that still need more attention.

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