Now showing items 41-60 of 87

    • Methane from Syngas by Anaerobic Digestion 

      Shah, Sanjay; Bergland, Wenche Hennie; Bakke, Rune (Journal article; Peer reviewed, 2017)
      Anaerobic digestion (AD) is a prominent green technology used for methane production from organic waste. Previous studies have shown that the amount of CH4 produced during anaerobic digestion can be increased by adding ...
    • Model Based Early Kick/Loss Detection and Attenuation with Topside Sensing in Managed Pressure Drilling 

      Jinasena, Asanthi; Holta, Haavard H. F.; Jondahl, Morten Hansen; Welahettige, Prasanna Kumara Welahetti; Aamo, Ole Morten; Sharma, Roshan; Viumdal, Håkon; Lie, Bernt (Peer reviewed; Journal article, 2020)
      Early kick/loss detection is a crucial part of safe well control, and it plays a major role in the reduction of risk and non-productive time in drilling. In conventional drilling, topside sensing is used for early kick/loss ...
    • Model uncertainty of interfacial area and mass transfer coefficients in absorption column packings 

      Karunarathne, Sumudu S.; Eimer, Dag-Arne; Øi, Lars Erik (Journal article; Peer reviewed, 2017)
      Uncertainty in model input parameters propagates through the model to make model output imprecision. Here, mathematical models used to calculate interfacial area and mass transfer coefficient for both random and structured ...
    • 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 ...
    • Modeling N/S ratio and temperature effects in simultaneous biological denitrification and sulfide oxidation 

      Sposob, Michal; Bakke, Rune; Dinamarca, Carlos (Journal article; Peer reviewed, 2017)
      A model describing the simultaneous removal of NO3- and HS- by microorganisms is presented here. The oxidation of HS- (electron donor) can be controlled by the appropriate dosage of NO3-. The developed model, which includes ...
    • Moving Bed Biofilm Process in Activated Sludge Model 1 for Reject Water Treatment 

      Sivalingam, Vasan; Arachchige, Gamunu L. Samarakoon; Dinamarca, Carlos (Peer reviewed; Journal article, 2021)
      A moving bed biofilm (MBB) process was modelled in AQUASIM using the standard activated sludge model 1 (ASM1) as a baseline. The model was controlled against experimental data from a pilot Hybrid Vertical Anaerobic Biofilm ...
    • Near Well CFD Simulation of SAGD Extra Heavy Oil Production 

      Kahawalage, Amila Chandra; Halvorsen, Britt; Mathiesen, Vidar (Journal article; Peer reviewed, 2015-11-25)
      Near well computational fluid dynamic simulation for extra heavy oil production using steam assisted gravity drainage was studied with ANSYS Fluent software. Computational fluid dynamic simulation can predict the multiphase ...
    • Near Well Simulation of CO2 Injection for Enhanced Oil Recovery (EOR) 

      Chathurangani, L.B.J.; Halvorsen, Britt (Journal article; Peer reviewed, 2015-11-25)
      A major challenge in oil industry is the declining oil production and the relatively low recovery rate. Estimates show that although the oil is localized and mobile, more than half of the oil is remaining in the reservoir ...
    • 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 ...
    • Nearwell Simulation of a horizontal well in Atlanta Field in Brazil with AICV® completion using OLGA/Rocx 

      Aparecida Da Silva, Katia; Halvorsen, Britt (Journal article; Peer reviewed, 2015-11-25)
      Brazil has special attention in the world oil scenario due its recent findings of oil reservoirs. Most of these reservoirs are heavy oil. The increasing energy consumption and discovery of heavy oil reservoirs require more ...
    • 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, ...
    • Numerical modeling of the calcination process in a cement kiln system 

      Kahawalage, Amila Chandra; Melaaen, Morten Christian; Tokheim, Lars-André (Journal article; Peer reviewed, 2017)
      The calcium carbonate decomposition into calcium oxide and carbon dioxide is a key process step in a cement kiln. The reaction requires thermal energy input, and pulverized coal is the fuel typically used for this purpose ...
    • On Uncertainty Analysis of the Rate Controlled Production (RCP) Model 

      Hosnaroudi, Soheila Taghavi; Ghaderi, Ali (Peer reviewed; Journal article, 2021)
      Rate controlled production (RCP) model is used to simulate and investigate the performance of the oil wells which are completed by autonomous inflow control devices. In order to quantify the performance of the RCP model, ...
    • Open Active Contour Model For Front Tracking Of Detonation Waves 

      Maharjan, Samee; Lysaker, Ola Marius; Gaathaug, André Vagner (Journal article; Peer reviewed, 2017)
      This paper presents an image processing framework for tracking the front of the detonation wave from a sequence of images. The images are captured by high speed camera during a laboratory gas explosion experiment. By ...
    • Optimization of gas velocity and pressure drop in CO2 absorption column 

      Park, Kwangsu; Øi, Lars Erik (Journal article; Peer reviewed, 2017)
      For a traditional amine-based CO2 capture system, the absorber column accounts for a significant part of the overall capital- and operating cost. One important design factor of absorber columns is the gas velocity through ...
    • Piping Components: An Analysis of the Critical Dimensions 

      Anderson, Gwen; Gjerde, Ida Helene; Helgesen, Sondre Luca; Jecmenica, Mladen; Thapa, Rajan Kumar (Peer reviewed; Journal article, 2020)
      Pipe components such as elbow, tees, and weldolets are produced at various places in the world. Although the component is produced in accordance with standard ASME (American Society of Mechanical Engineers) B16.9, measurements ...
    • Process Design of a Novel Low Temperature Methanol Synthesis Process Using an Air-blown Autothermal Reformer 

      Ahoba-Sam, Christian; Øi, Lars Erik; Jens, Klaus-Joachim (Journal article; Peer reviewed, 2018)
      Methanol (MeOH) synthesis at low temperature (100 oC) presents an opportunity for full syngas conversion per pass. This presents a cheaper alternative for MeOH synthesis using an air-blown autothermal reformer (ATR) rather ...
    • 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 ...
    • Sensitivity Analysis and Effect of Simulation parameters of CPFD Simulation in Fluidized Beds 

      Bandara, Janitha; Nielsen, Henrik Kofoed; Moldestad, Britt Margrethe Emilie; Eikeland, Marianne Sørflaten (Journal article; Peer reviewed, 2018)
      Fluidized bed technology is broadly applied in industry due to its distinct advantages. CFD simulation of fluidized beds is still challenging compared to single-phase systems and needs extensive validation. Multiphase ...
    • Sensitivity and Uncertainty Analysis in a Circulating Fluidized Bed Reactor Modeling 

      Barahmand, Zahir; Jayarathna, Chameera; Ratnayake, Chandana (Peer reviewed; Journal article, 2022)
      As in many real applications, in the world of fine powders and small particles, there are uncertainties and vagueness in the parameters such as particle size, sphericity, initial solid void fraction, envelope density, etc. ...