Cornelius Agu

Cornelius Agu
University of South-Eastern Norway | USN

PhD

About

22
Publications
6,941
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204
Citations
Citations since 2016
17 Research Items
201 Citations
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201620172018201920202021202201020304050
201620172018201920202021202201020304050
201620172018201920202021202201020304050

Publications

Publications (22)
Article
Full-text available
During the storage of biogenic materials for energy utilization, destructions by microbial attacks take place inevitably. Besides the material degradation, self-ignition of wood chip piles also occurs consistently. Treating the feedstock with for example, mineral additives such as Dolomite can inhibit the microbial destructions, though such treatme...
Article
Full-text available
A one-dimensional unsteady state model is developed for simulation of biomass gasification in a bubbling fluidized bed. The proposed model accounts for the effect of hydrodynamic behaviour of the fluidized bed by incorporating the momentum equations of fluid and fuel particles. The model results are validated against experimental data in the litera...
Article
Full-text available
Gasification of biomass in bubbling fluidized beds can be limited by accumulation of unconverted char particles during the process. The amount of unconverted biomass depends on the residence time of the fuel particles. This study demonstrates a method for measuring the biomass residence time over the conversion period at a given air flowrate and a...
Article
Full-text available
For successful operation and design of a bubbling fluidized bed reactor handling a specific biomass, in-depth knowledge about the bed behaviour is paramount. This study compares the behaviour of a bed of sand containing wood pellets with that containing wood chips at different gas velocities and biomass proportions in a cold fluidized bed of diamet...
Conference Paper
Full-text available
The behaviour of a bubbling fluidized bed can be measured by analyzing appropriate bubble properties. With knowledge of the solids fraction distribution across the bed at any instance, a number of bubble properties can be determined. This study discusses how bubble properties can be obtained using a dual-plane Electrical Capacitance Tomography (ECT...
Article
Full-text available
For operational control and design of a fluidized bed reactor containing different types of solid particles, the bed void fraction and minimum fluidization velocity are vital parameters. This paper demonstrates a method for predicting the void fraction and minimum fluidization velocity of different binary mixtures of particles with improved accurac...
Article
Full-text available
Deep bubbling fluidized beds have some advantages that make them attractive for industrial applications. Using different powders, this paper investigates the bubbling behaviour in deep beds. The results show that bubbles grow faster in the bed of angular/rough particles than in that of round/smooth particles, and that the rate of bubble growth incr...
Article
Full-text available
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 bed. An analytical model is developed for bubble rise velocity, which shows that the rise velocity of a single bubble is proporti...
Article
Full-text available
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 predictions have been a challenge. A new set of models for predicting the average bubble properties within the bubbling and sluggin...
Article
Full-text available
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 on the accuracy of flow rates computed based on hydraulic structure and slope-hydraulic radius methods. A model for determining...
Article
Full-text available
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 method for determining the onset of fluidized bed regimes using a two-plane electrical capacitance tomography (ECT) sensor. The met...
Article
Full-text available
Monitoring the flow rate out of the well is critical for good control of the downhole pressure in drilling operations. In this feasibility study, we explore the possibility of using a Venturi flume to provide a cost-effective measurement of the flow rate, with improved accuracy compared to conventional methods. A Venturi flume has been simulated bo...
Conference Paper
Full-text available
In certain applications, the use of a direct flow meter to measure flow rates could be very expensive due to size, and may give inaccurate results due to adverse operating conditions. One alternative is to use an open channel flow measurement technique. The use of a hydraulic structure such as Venturi flume with one point level measurement is robus...
Conference Paper
Full-text available
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 with staggered grids which we find suitable for control applications. Both steady state and dynamic solutions of the fluids wit...

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Projects

Projects (2)
Project
To develop a smart sensor for flow characteristics of non-Newtonian fluids
Project
To obtain the optimum parameters for syngas production used in biofuel synthesis