Blar i USN Open Archive på forfatter "Moldestad, Britt Margrethe Emilie"
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Image Processing and Measurement of the Bubble Properties in a Bubbling Fluidized Bed Reactor
Jaiswal, Rajan; Moldestad, Britt Margrethe Emilie; Eikeland, Marianne Sørflaten; Nielsen, Henrik Kofoed; Thapa, Rajan Kumar (Journal article; Peer reviewed, 2022)The efficiency of a fluidized bed reactor depends on the bed fluid dynamic behavior, which is significantly influenced by the bubble properties. This work investigates the bubble properties of a bubbling fluidized bed ... -
The Impact of Autonomous Inflow Control Valve on Improved Oil Recovery in a Thin-Oil-Rim Reservoir
Hosnaroudi, Soheila Taghavi; Aakre, Haavard; Tahami, Seyed Amin; Moldestad, Britt Margrethe Emilie (Peer reviewed; Journal article, 2024)Oil production from thin-oil-rim fields can be challenging as such fields are prone to gas coning. Excessive gas production from these fields results in poor production and recovery. Hence, these resources require advanced ... -
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 ... -
Improved multi-stage cross-flow fluidized bed classifier
Jayarathna, Chameera; Balfe, Michael; Moldestad, Britt Margrethe Emilie; Tokheim, Lars-Andre (Peer reviewed; Journal article, 2019)In the present work, improvements to a novel fluidized bed solids classification system previously published by Jayarathna et al. are discussed (Jayarathna et al., 2018 [1]). The system is designed for a high temperature ... -
Improving bench scale design for polymerisation of green CO2-polymers
Larsen, Thomas S.; Sætre, Kai Arne; Ronasi, Sara; Haugen, Hildegunn H.; Moldestad, Britt Margrethe Emilie (Journal article; Peer reviewed, 2018)Plastic has become the most common material since the beginning of the 20th century and has become almost indispensable due to its durability, light weight and low costs. However, some of the characteristics also make the ... -
Improving bench scale pilot reactor design for polymerisation of green CO2-polymers
Larsen, Thomas S.; Sætre, Kai Arne; Ronasi, Sara; Haugen, Hildegunn H.; Moldestad, Britt Margrethe Emilie (Journal article; Peer reviewed, 2018)Plastic has become the most common material since the beginning of the 20th century and has become almost indispensable due to its durability, light weight and low costs. However, some of the characteristics also make the ... -
Investigation of bubbling behavior in deep fluidized beds at different gas velocities using electrical capacitance tomography
Agu, Cornelius Emeka; Ugwu, Ambrose; Pfeifer, Christoph; Eikeland, Marianne Sørflaten; Tokheim, Lars-André; Moldestad, Britt Margrethe Emilie (Peer reviewed; Journal article, 2019)Deep bubbling fluidized beds have some advantages that make them attractive for industrial applications. Using different powders, this paper investigates the bubbling behavior in deep beds. The results show that bubbles ... -
Investigation of the segregation and mixing behavior of biomass in a bubbling fluidized bed reactor using a CPFD model
Jaiswal, Rajan; Furuvik, Nora Cecilie Ivarsdatter; Thapa, Rajan Kumar; Moldestad, Britt Margrethe Emilie (Journal article; Peer reviewed, 2019)Segregation of biomass in a gasification reactor is an inevitable problem that can jeopardize the advantages such as uniform temperature control and proper mass circulation, and good solid-gas contacting area of the fluidized ... -
Measurement and characterization of biomass mean residence time in an air-blown bubbling fluidized bed gasification reactor
Agu, Cornelius Emeka; Pfeifer, Christoph; Eikeland, Marianne Sørflaten; Tokheim, Lars-André; Moldestad, Britt Margrethe Emilie (Peer reviewed; Journal article, 2019)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. ... -
Method of identifying an operating regime in a bubbling fluidized bed gasification reactor
Jaiswal, Rajan; Furuvik, Nora Cecilie Ivarsdatter; Thapa, Rajan Kumar; Moldestad, Britt Margrethe Emilie (Journal article; Peer reviewed, 2020)This work presents a new method for identifying the bubbling regime of a fluidized bed gasification reactor. The method has been developed using experimental measurements and a computational model. Pressure drops are ... -
Modeling and simulation of light oil production using inflow control devices
Timsina, Ramesh; Furuvik, Nora Cecilie Ivarsdatter; Moldestad, Britt Margrethe Emilie (Journal article; Peer reviewed, 2017)Light crude oil production is the most economical and is currently serving as benchmark together with medium crude oil. The most of the conventional oil fields in the worlds are either light or medium crude oil. Conventional ... -
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; Moldestad, Britt Margrethe Emilie (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 ... -
Near-well simulation of oil production from a horizontal well with ICD and AICD completions in the Johan Sverdrup field using OLGA/ROCX
Moradi, Ali; Moldestad, Britt Margrethe Emilie (Journal article; Peer reviewed, 2020)One of the main principles of improving oil recovery is maximizing the contact area between the well and the reservoir. To achieve this purpose especially in reservoirs with a thin oil column, long horizontal wells are ... -
A new Approach for Scaling Up from a Small Cold to a Large Hot Bed for Biomass Conversion in a Bubbling Fluidized Bed Reactor
Agu, Cornelius Emeka; Thapa, Rajan Kumar; Pfeifer, Christoph; Tokheim, Lars-Andre; Moldestad, Britt Margrethe Emilie (Peer reviewed; Journal article, 2020)Bubbling fluidized beds are simple and attractive means of achieving efficient conversion of biomass if particle segregation and the associated effects are minimized. To improve the knowledge of fluidized bed reactor design, ... -
Performance of CO2 flooding in a heterogeneous oil reservoir using autonomous inflow control
Aakre, Haavard; Mathisen, Vidar; Moldestad, Britt Margrethe Emilie (Journal article; Peer reviewed, 2018)CO2-EOR is one of the main methods for enhanced oil recovery. The injection of CO2 does not only improve oil recovery, but also contributes to reduction of greenhouse gas emissions. However, many CO2-EOR project are reporting ... -
Prediction of void fraction and minimum fluidization velocity of a binary mixture of particles: Bed material and fuel particles
Agu, Cornelius Emeka; Pfeifer, Christoph; Moldestad, Britt Margrethe Emilie (Peer reviewed; Journal article, 2019)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 ... -
Pyrolysis of biomass
Dawod, Ahmad (Master thesis, 2021)Pyrolysis of biomass is considered to be a green technology since it has no impacts or emissions to the environment. Pyrolysis of biomass is the initial stage in the gasification process and is defined as the thermal ... -
Pyrolysis of plastic waste to environmental friendly products
Pandey, Umesh; Stormyr, Jan Arild; Hassani, Alireza; Jaiswal, Rajan; Haugen, Hildegunn Hegna; Moldestad, Britt Margrethe Emilie (Journal article; Peer reviewed, 2020)Pyrolysis of plastics is one of the efficient ways to recover plastic waste. Pyrolysis refers to a thermal degradation of long-chain organic molecules into smaller hydrocarbons. Many ongoing research studies are trying to ... -
Recommended guideline for allocation simulation
Smedsli, Madelen (Master thesis, 2021)En plattform har ofte olje- og gassproduksjon fra mer enn ett felt. Bestemmelsen av hvor mye olje og gass som kommer fra de forskjellige feltene kalles allokering. Plattformen studert i denne rapporten heter Platform Vest, ... -
Screening of Kinetic Rate Equations for Gasification Simulation Models (opptrykk)
Solli, KjellArne; Thapa, Rajan Kumar; Moldestad, Britt Margrethe Emilie (Journal article; Peer reviewed, 2018)The energy from biomass can be utilized through the thermochemical conversion process of pyrolysis and gasification. The process involves solid phase and fluid phase interactions. Computational Particle Fluid Dynamics ...