• Algorithm with improved accuracy for real-time measurement of flow rate in open channel systems 

      Agu, Cornelius Emeka; Hjulstad, Åsmund; Elseth, Geir; Lie, Bernt (Journal article; Peer reviewed, 2017)
      Most methods for flow rate measurement in open channels usually have low accuracy over a range of flow rates due to varying fluid properties, flow conditions and channel length. This paper suggests an algorithm to improve ...
    • Determination of onset of bubbling and slugging in a fluidized bed using a dual-plane electric capacitance tomography system 

      Agu, Cornelius Emeka; Tokheim, Lars-André; Eikeland, Marianne Sørflaten; Halvorsen, Britt (Journal article; Peer reviewed, 2017)
      For a successful application of fluidized beds in chemical reactions and solids circulation, the boundary of regime of operation such as bubbling and slugging regimes, needs to be clearly defined. This study provides a ...
    • Distribution of Solids in a Fluidized Bed Operated without a Gas Distributor 

      Agu, Cornelius Emeka; Moldestad, Britt Margrethe Emilie (Journal article; Peer reviewed, 2018)
      Despite several advantages of a gas distributor, there are also some challenges in its application. Using a gas distributor increases the fluidizing gas compression cost. Due to deposition of fine particles and product of ...
    • Distribution of Solids in a Fluidized Bed Operated without a Gas Distributor 

      Agu, Cornelius Emeka; Moldestad, Britt Margrethe Emilie (Journal article; Peer reviewed, 2018)
      Despite several advantages of a gas distributor, there are also some challenges in its application. Using a gas distributor increases the fluidizing gas compression cost. Due to deposition of fine particles and product of ...
    • Evaluation of drag models for CFD simulation of fluidized bed biomass gasification 

      Solli, Kjell Arne; Agu, Cornelius Emeka (Journal article; Peer reviewed, 2017)
      Gasification of biomass into suitable feedstock has become a feasible alternative technology for reducing the use of energy feedstock from fossil sources. Usually, fluidized bed technology is used in the biomass gasification ...
    • Improved Models for Predicting Bubble Velocity, Bubble Frequency and Bed Expansion in a Bubbling Fluidized Bed 

      Agu, Cornelius Emeka; Tokheim, Lars-André; Eikeland, Marianne Sørflaten; Moldestad, Britt Margrethe Emilie (Journal article; Peer reviewed, 2018)
      An efficient design and operational control of a fluidized bed reactor relies on accurate prediction of bubble properties. This paper employs measurement of bed void fraction in determining the bubble velocity in a given ...
    • Models for Predicting Average Bubble Diameter and Volumetric Bubble Flux in Deep Fluidized Beds 

      Agu, Cornelius Emeka; Pfeifer, Christoph; Eikeland, Marianne Sørflaten; Tokheim, Lars-André; Halvorsen, Britt Margrethe (Journal article; Peer reviewed, 2018)
      The average bubble diameter and volumetric bubble flux give indications about the overall bed expansion in a fluidized bed. As these properties depend on the particle properties and fluidized bed regime, their accurate ...
    • Numerical solution of the Saint Venant equation for Non-Newtonian fluid 

      Agu, Cornelius Emeka; Lie, Bernt (Conference object; Peer reviewed, 2014)
      Non-Newtonian fluid flow through a Venturi channel is studied using the Saint Venant equation. The nonlinear hyperbolic equation is numerically tricky to solve, therefore in this study, we consider the finite volume method ...
    • Simulation of Simplified Model for Reaction Kinetics in Biomass Gasification 

      Agu, Cornelius Emeka; Thapa, Rajan Kumar; Halvorsen, Britt (Conference object; Peer reviewed, 2015-11-25)
      Due to complexity in interactions between solid particles and between particles and carrier fluid, modeling of biomass gasification kinetics has been shown to be very challenging. Some commercial packages such as Barracuda ...
    • Simulation of Transcritical Flow in Hydraulic Structures 

      Agu, Cornelius Emeka; Lie, Bernt; Elseth, Geir (Conference object; Peer reviewed, 2015-11-25)
      In hydraulic engineering, transcritical flows are often required in some applications. One example is in a Venturi channel where the occurrence of critical depth is used to estimate flow rate in the channel. In this paper, ...
    • Simulation of Transcritical Flow in Hydraulic Structures 

      Agu, Cornelius Emeka; Lie, Bernt; Elseth, Geir (Conference object; Peer reviewed, 2015-11-25)
      In hydraulic engineering, transcritical flows are often required in some applications. One example is in a Venturi channel where the occurrence of critical depth is used to estimate flow rate in the channel. In this paper, ...
    • Study of fluidized bed regimes using Computational Particle Fluid Dynamics 

      Jaiswal, Rajan; Agu, Cornelius Emeka; Thapa, Rajan Kumar; Moldestad, Britt Margrethe Emilie (Journal article; Peer reviewed, 2018)
      The fluidization technology has a wide range of applications. In chemical synthesis, fluidized bed is used to enhance heat and mass transfer between the reacting species. More application of this technology can also be ...
    • Study of fluidized bed regimes using Computational Particle Fluid Dynamics 

      Jaiswal, Rajan; Agu, Cornelius Emeka; Thapa, Rajan Kumar; Moldestad, Britt Margrethe Emilie (Journal article; Peer reviewed, 2018)
      The fluidization technology has a wide range of applications. In chemical synthesis, fluidized bed is used to enhance heat and mass transfer between the reacting species. More application of this technology can also be ...