Review on gas-liquid mixing analysis in multiscale stirred vessel using CFD
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Baharak Sajjadi
Baharak Sajjadi was born in Iran in 1984. She graduated with a chemical engineering degree in 2008 in Arak University, Iran, and received her master’s degree in 2010 at the same university. She worked on hydrodynamics and mass transfer investigations in airlift bioreactors with CFD. She joined the University of Malaya, Malaysia, in 2011 as a doctoral candidate working on biochemical processing, with particular interest in biofuel production. Other interests include development, validation, and optimization in unconventional geometries.
Dr. 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 is currently supervising 15 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).
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Shaliza Ibrahim
Prof. Shaliza Ibrahim is affiliated with the Department of Civil Engineering at the University of Malaya under the Environmental Engineering Programme. A chemical engineer by training, her interest in mixing research stemmed from her PhD study back in 1988–1992 at the University of Birmingham in the area of multiphase mixing in stirred vessels. She has been instrumental in keeping mixing research going at the University of Malaya, with particular interest in solid-liquid mixing. Her more recent projects are applied to biological and adsorption processes in wastewater treatment.
Raja Shazrin Shah was born in Malaysia in 1981. He graduated with a chemical engineering degree in 2004 in the University of Malaya, Malaysia, and received his master’s degree in 2010 in 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.
Abstract
This review aims to establish common approaches and equations used in computational fluid dynamics (CFD) analysis for gas-liquid mixing operations and investigate their strengths and weaknesses. The review concluded that with a sufficient computing strength, Eulerian-Lagrangian approaches can simulate detailed flow structures for dispersed multiphase flow with high spatial resolution. Turbulence is an important factor in fluid dynamics, and literature confirmed that k-ε is the most widely used turbulence model. However, it suffers from some inherent shortcomings that stemmed from the assumption of isotropy of turbulence and homogenous mixing, which is suitable for very high Reynolds number in unbaffled stirred vessels. In CFD simulations for gas-liquid systems in stirred vessels, bubble size distribution is the most important parameter; hence, different techniques for formulation of bubble size equations have been investigated. These techniques involve source and sink terms for coalescence or breakup and provide a framework in which the population balance method together with the coalescence and breakup models can be unified into three-dimensional CFD calculations. Different discretization schemes and solution algorithms were also reviewed to confirm that third-order solutions provide the least erroneous simulation results.
About the authors
Baharak Sajjadi was born in Iran in 1984. She graduated with a chemical engineering degree in 2008 in Arak University, Iran, and received her master’s degree in 2010 at the same university. She worked on hydrodynamics and mass transfer investigations in airlift bioreactors with CFD. She joined the University of Malaya, Malaysia, in 2011 as a doctoral candidate working on biochemical processing, with particular interest in biofuel production. Other interests include development, validation, and optimization in unconventional geometries.
Dr. 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 is currently supervising 15 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).
Prof. Shaliza Ibrahim is affiliated with the Department of Civil Engineering at the University of Malaya under the Environmental Engineering Programme. A chemical engineer by training, her interest in mixing research stemmed from her PhD study back in 1988–1992 at the University of Birmingham in the area of multiphase mixing in stirred vessels. She has been instrumental in keeping mixing research going at the University of Malaya, with particular interest in solid-liquid mixing. Her more recent projects are applied to biological and adsorption processes in wastewater treatment.
Raja Shazrin Shah was born in Malaysia in 1981. He graduated with a chemical engineering degree in 2004 in the University of Malaya, Malaysia, and received his master’s degree in 2010 in 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.
©2012 by Walter de Gruyter Berlin Boston
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- Inorganic membranes for carbon dioxide and nitrogen separation
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- Review on gas-liquid mixing analysis in multiscale stirred vessel using CFD
Articles in the same Issue
- Masthead
- Masthead
- A changing chemical industry
- Optimization and advanced control of thermal energy storage systems
- Inorganic membranes for carbon dioxide and nitrogen separation
- Thermodynamic and hydrodynamic response of compressed air energy storage reservoirs: a review
- On the population balance equation
- Review on gas-liquid mixing analysis in multiscale stirred vessel using CFD
