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Multiple-impeller stirred vessel studies

  • See Tiam You

    See Tiam You, a native Malaysian, graduated with a chemical engineering degree in 2012 and enrolled in a master’s degree program at the University of Malaya, Malaysia, in the same year. Encouraged by research interests in the field of mixing and with excellent laboratory skills, his current research focuses on performance studies in a multi-impeller stirred vessel for gas-liquid-solid system aiming at identifying key parameters that enhance performance in a multi-impeller stirred vessel.

    , Abdul Aziz Abdul Raman

    Raja Shazrin Shah graduated with a chemical engineering degree in 2004 from the University of Malaya, Malaysia, and received his master’s degree in 2010 from the same university. He worked on applied research for resource recovery for waste streams coming from natural rubber and palm oil industries in Malaysia, with particular emphasis on membrane technologies. He joined as a doctoral candidate in 2012 in the same university, working on hydrodynamic studies on multiphase systems in stirred reactors.

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    , Raja Shazrin Shah Raja Ehsan Shah

    Abdul Aziz completed his PhD in the area of three-phase mixing. Currently, he is an associate professor and holds the position of deputy dean at the Faculty of Engineering, University of Malaya, Malaysia. His research interests are in mixing in stirred vessels and cleaner production technologies. He is also active in consultancy projects and supervised many PhD candidates. He is a member of a number of professional and learned societies such as the Institution of Chemical Engineers (IChemE, UK), the Institution of Engineers Malaysia (IEM), and the American Chemical Society (ACS).

    and Mohamad Iskandr Mohamad Nor

    Mohamad Iskandr Mohamad Nor is a senior lecturer in the Department of Chemical Engineering at University of Malaya, Malaysia. He received his BE and MSc in Chemical Engineering from Lakehead University and Queen’s University, Canada, respectively. His interests include applications of computational fluid dynamics (CFD) in Chemical Engineering, Linux OS and open source software in engineering.

Published/Copyright: March 27, 2014
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Abstract

Multi-impeller stirred vessels are widely used for industrial applications. Based on the numerous studies that reported the motivation and importance of studies on multi-impeller systems, a systematic study was conducted to identify the focus and objectives of research and types of experiments conducted using multi-impeller systems. Researchers mainly focused on the effects of impeller spacing, off-bottom clearance, and type of impeller combinations. Most experiments were conducted on power number, power consumption, gas hold-up, and gas-liquid mass transfer. Research works have not exhausted all impeller-type combinations and there are still opportunities for future work. Computational fluid dynamics studies involving multi-impeller systems are also still lacking owing to flow complexities. This work can serve as a roadmap for future study themes.


Corresponding author: Abdul Aziz Abdul Raman, Faculty of Engineering, Department of Chemical Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia, e-mail:

About the authors

See Tiam You

See Tiam You, a native Malaysian, graduated with a chemical engineering degree in 2012 and enrolled in a master’s degree program at the University of Malaya, Malaysia, in the same year. Encouraged by research interests in the field of mixing and with excellent laboratory skills, his current research focuses on performance studies in a multi-impeller stirred vessel for gas-liquid-solid system aiming at identifying key parameters that enhance performance in a multi-impeller stirred vessel.

Abdul Aziz Abdul Raman

Raja Shazrin Shah graduated with a chemical engineering degree in 2004 from the University of Malaya, Malaysia, and received his master’s degree in 2010 from the same university. He worked on applied research for resource recovery for waste streams coming from natural rubber and palm oil industries in Malaysia, with particular emphasis on membrane technologies. He joined as a doctoral candidate in 2012 in the same university, working on hydrodynamic studies on multiphase systems in stirred reactors.

Raja Shazrin Shah Raja Ehsan Shah

Abdul Aziz completed his PhD in the area of three-phase mixing. Currently, he is an associate professor and holds the position of deputy dean at the Faculty of Engineering, University of Malaya, Malaysia. His research interests are in mixing in stirred vessels and cleaner production technologies. He is also active in consultancy projects and supervised many PhD candidates. He is a member of a number of professional and learned societies such as the Institution of Chemical Engineers (IChemE, UK), the Institution of Engineers Malaysia (IEM), and the American Chemical Society (ACS).

Mohamad Iskandr Mohamad Nor

Mohamad Iskandr Mohamad Nor is a senior lecturer in the Department of Chemical Engineering at University of Malaya, Malaysia. He received his BE and MSc in Chemical Engineering from Lakehead University and Queen’s University, Canada, respectively. His interests include applications of computational fluid dynamics (CFD) in Chemical Engineering, Linux OS and open source software in engineering.

Nomenclature
H

Height of liquid in stirred tank, m

HG

Height of liquid in the presence of gas, m

Ho

Height of liquid in absence gas, m

n

Number of impellers used

D

Diameter of impeller used, m

T

Diameter of stirred tank, m

C1

Off-bottom clearance of lower impeller, m

C2

Spacing between lower and middle impellers, m

C3

Spacing between middle and top impellers, m

S

Impeller spacing, m

Np

Power number

P

Power consumption, kg m2/s3

ρ

Density of fluid, kg/m3

N

Agitation speed, rpm

θ(t)

Mixing time, s

C

Concentration of tracer

ε

Gas hold-up

R

TRushton turbine

PBT

Pitched blade turbine

HEDT

Half-elliptical blade disk turbine

TXU

Hydrofoil impeller up flow

WHU

Up-pumping wide-blade hydrofoil

ABDT

Alternate blade disc turbine

CFD

Computational fluid dynamics

Acknowledgments

This research is supported by a Postgraduate Research Fund (PPP) with project number PG115-2012B from the University of Malaya.

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Received: 2013-8-13
Accepted: 2014-1-26
Published Online: 2014-3-27
Published in Print: 2014-6-1

©2014 by Walter de Gruyter Berlin/Boston

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