• Quantification of biofilm accumulation by an optical approach 

      Bakke, Rune; Kalvenes, Sigmund; Kommedal, Roald (Journal article; Peer reviewed, 2001-02)
      Methods for non-invasive, in situ, measurements of biofilm optical density and biofilm optical thickness were evaluated based on Pseudomonas aeruginosa experiments. Biofilm optical density, measured as intensity reduction ...
    • Raman Spectroscopy as an Online Monitoring Tool for CO2 Capture Process: Demonstration Using a Laboratory Rig 

      Jinadasa, Wathsala; Jens, Klaus-Joachim; Øi, Lars Erik; Halstensen, Maths (Journal article; Peer reviewed, 2017)
      A laboratory CO2 capture rig at USN was used as a demonstration plant to show the feasibility of Raman spectroscopy for online monitoring of speciation in CO2 capture process. The spectroscopy was integrated to lean and ...
    • Re-initiation of detonation across an inert region 

      Bjerketvedt, Dag (Doktor ingeniøravhandling;374, Doctoral thesis, 1985)
      Re-initiation of gaseous C-J detonation waves across a region of air has been studied experimentally. The experimental apparatus consisted of a 9 meter long square tube with internal dimensions of 125 mm. The Random Choice ...
    • A Real-Time Flow-Measuring Algorithm for Open Venturi Channel Non-Newtonian Flow 

      Welahettige, Prasanna Kumara Welahetti; Lie, Bernt; Vågsæther, Knut (Peer reviewed; Journal article, 2019)
      A real-time flow measuring algorithm is developed for the open Venturi channel non-Newtonian flow measurement. Using a single level sensor reading at downstream of the open Venturi channel, a drilling-well return flow rate ...
    • Recruiting engineering students from vocational school 

      Clausen, Trond; Hagen, Svein Thore; Hasleberg, Harald; Aarnes, Jens Harald (Conference report, 2003)
      By the consent of the Norwegian Ministry of Education and Research, Telemark University College (TUe), Porsgrunn, Norway, this fall semester started a pilot class in electrical engineering recruiting solely from vocational ...
    • Riemann solver for combustion waves 

      Vågsæther, Knut (Professional article, 2011-05-03)
    • The sampling interface—A critical Theory of Sampling success factor in process sampling and PAT 

      Esbensen, Kim; Sivalingam, Vasan (Journal article, 2022)
      In the process industry arena, analytical endeavors are today well served by the Process Analytical Technology (PAT) framework, offering a plentitude of on-line analytics, mostly spectroscopic: UV-VIS, NIR, RAMAN, NMR, ...
    • A Scoping Review on Environmental, Economic, and Social Impacts of the Gasification Processes 

      Barahmand, Zahir; Eikeland, Marianne Sørflaten (Peer reviewed; Journal article, 2022)
      In recent years, computer-based simulations have been used to enhance production processes, and sustainable industrial strategies are increasingly being considered in the manufacturing industry. In order to evaluate the ...
    • 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 ...
    • Selection of packing materials for gas absorption 

      Arachchige, Udara Sampath P.; Melaaen, Morten Christian (Journal article; Peer reviewed, 2012)
      Carbon dioxide (CO2) capture is the most viable option to minimize the environmental impact by CO2 emissions. Amine scrubbing process is the well-known technology to achieve that. There are several packing types available ...
    • Sensitivity Analysis and Anaerobic Digestion Modeling: A Scoping Review 

      Barahmand, Zahir; Samarakoon Arachchige, Gamunu (Peer reviewed; Journal article, 2022)
      A growing awareness of global climate change has led to an increased interest in investigating renewable energy sources, such as the anaerobic digestion of biomass. This process utilizes a wide range of microbial communities ...
    • 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. ...
    • Simple modelling approach using Modelica for microbial electrosynthesis 

      Arachchige, Gamunu L. Samarakoon; Winkler, Dietmar; Sivalingam, Vasan; Dinamarca, Carlos; Bakke, Rune (Peer reviewed; Journal article, 2020)
      This study intends to develop a simple mathematical model that contributes to the integration of Microbial Electrosynthesis (MES) in AD to reduce CO2 to CH4. Open-source modelling language Modelica was used to build the ...
    • Simulating CSF flow dynamics in the normal and chiari I subarachnoid space during rest and exertion 

      Linge, Svein; Mardal, Kent-Andre; Haughton, Victor; Helgeland, Anders (Journal article; Peer reviewed, 2012)
      BACKGROUND AND PURPOSE: CSF fluid dynamics in healthy subjects and patients with Chiari I have been characterized during rest with phase-contrast MR imaging and CFD. CSF flow velocities and pressures in the nonresting state ...
    • Simulation and Cost Comparison of CO2 Liquefaction 

      Øi, Lars Erik; Eldrup, Nils Henrik; Adhikari, Umesh; Bentsen, Mathias Håvåg; Badalge, Jayalanka Chathurangani Liyana; Yang, Songbo (Journal article; Peer reviewed, 2016)
      Liquefaction of CO2 is an intermediate step for storage or ship transport. Two processes are suggested. The traditional method is based on external refrigeration and the other is an integrated refrigeration process. In the ...
    • Simulation and Economic Optimization of Amine-based CO2 Capture using Excess Heat at a Cement Plant 

      Ali, Hassan; Øi, Lars Erik; Eldrup, Nils Henrik (Journal article; Peer reviewed, 2018)
      In order to remove CO2 from power or process industry, a well-known method is absorption in monoethanolamine (MEA) followed by desorption, and this technology has been in operation for decades. The major challenge is the ...
    • Simulation and Economic Optimization of Vapour Recompression Configuration for Partial CO2 capture 

      Øi, Lars Erik; Sundbø, Erik; Ali, Hassan (Journal article; Peer reviewed, 2017)
      A standard method for CO2 capture is by absorption in an amine based solvent followed by desorption. Such plants are traditionally designed for removal of 85-90 % CO2 from the exhaust gas as a reasonable trade-off between ...
    • Simulation and Impact of different Optimization Parameters on CO2 Capture Cost 

      Aromada, Solomon Aforkoghene; Karunarathne, Sumudu; Eldrup, Nils Henrik; Orangi, Sina; Farsi Madan, Farzan; Fajferek, Katarzyna Grazyna; Sæter, Njål Torgeir; Bahri, Syaiful; Øi, Lars Erik (Journal article; Peer reviewed, 2021)
      The influence of different process parameters/factors on CO2 capture cost, in a standard amine based CO2 capture process was studied through process simulation and cost estimation. The most influential factor was found to ...
    • Simulation and optimization of screw feeder in a bubbling fluidized bed gasification reactor 

      Thapa, Rajan Kumar; Vaa, Trym Fehn; Vaa, Oddvin; Jaiswal, Rajan; Jecmenica, Mladen (Journal article; Peer reviewed, 2022)
      A fluidized bed biomass gasification reactor is used to produce syngas from biomass and municipal wastes. Gasification is a flexible technology where many different types of feedstocks can be used. The University of ...