• A 7-field Lagrangian slug capturing and slug tracking model with higher order methods 

      Smith, Ivar Eskerud (Doctoral theses at NTNU;2017:246, Doctoral thesis, 2017)
      In this thesis, a 7-field Lagrangian slug capturing and slug tracking model with higher order methods and an adaptive grid is investigated for predicting the behaviour of two-phase gasliquid flow in multiphase flow pipelines. ...
    • A numerical study on vortex-induced vibrations and the effect of slurry density variations on fatigue of ocean mining risers 

      Thorsen, Mats Jørgen; Challabotla, Niranjan Reddy; Sævik, Svein; Nydal, Ole Jørgen (Journal article; Peer reviewed, 2019)
      Ocean mining emerges as a way of meeting future demands for valuable minerals. Risers conveying ore from the seabed to the surface must withstand large wave and current loads. In addition, vortex-induced vibrations (VIV) ...
    • A study of two-phase gas-liquid flow with viscous oil in a vertical pipe and annuli channel 

      Bolarinwa, Olusegun Damilare (Master thesis, 2016)
      The knowledge of gas-liquid flows in annulus geometries can be found in several applications such as the geothermal, nuclear, space, chemical and petroleum. Over time, the design of ducts with annulus geometries for transport ...
    • Absorber for concentrating solar heat collectors 

      Veslum, Trygve Stansberg (Master thesis, 2011)
      Open volumetric absorbers have been tested and evaluated with the objective to determine their ability to heat air for small scale concentrating solar systems, more exactly a solar oven where a stove is heated up by a rock ...
    • Adsorption-Based Heat Storage for Cooking 

      Jaya, Pomto (Master thesis, 2019)
      With the increasing effort to develop renewable technology, chemical heat storage has become more and more attractive. By using this type of storage, the heat dissipation issue is solved by storing the energy in the form ...
    • Beregningsprogram for sammenligning av flerfase strømningsmodeller 

      Stene, Marius (Master thesis, 2010)
      Flerfasestrømning er et komplekst forskningsområde med mange usikkerheter. Kompleksiteten gjør at litteraturen består av mange modeller med vilt forskjellige innfallsvinker for hvordan fasefraksjoner, trykkfall og ...
    • CFD Simulations of Multiphase Flows with Particles 

      Bikmukhametov, Timur (Master thesis, 2016)
      This Master s thesis describes two CFD studies particle plug propagation in bent pipes and critical velocity determination in dilute slurry flows. The objective of this study is to extend an understanding of these phenomena ...
    • Coupling of discrete-element method and smoothed particle hydrodynamics for liquid-solid flows 

      Huang, Jun; Nydal, Ole Jørgen (Journal article; Peer reviewed, 2012)
      Particle based methods can be used for both the simulations of solid and fluid phases in multiphase medium, such as the discrete-element method for solid phase and the smoothed particle hydrodynamics for fluid phase. This ...
    • Dampgenerering i en solfanger 

      Andreassen, Harald (Master thesis, 2013)
      Av praktiske og kulturelle årsaker har ikke tradisjonelle solkokere blitt implementert i landlige områder i afrikanske land. I områder med dårlig eller ikke-eksisterende strømnett blir mye tid brukt på å finne biodrivstoff ...
    • Design and Development of Solar Thermal Injera Baking: Steam Based Direct Baking 

      Tesfay, Asfafaw H; Kahsay, Mulu Bayray; Nydal, Ole Jørgen (Journal article; Peer reviewed, 2014)
      Ethiopia, the second most populated country in Africa, meets 96% of its energy need from bio-mass and majority of this energy goes entirely to Injera baking. Injera, a pan-cake like bread that is consumed by most of the ...
    • Direct Charging of a Solar Thermal Battery: Direkte soloppvarming av et termisk batteri 

      Sivertsen, Victoria (Master thesis, 2013)
      Direct illumination of a thermal storage from a concentrating solar collector can be used to charge a phase change material (PCM) for the purpose of storing heat for cooking. Top illumination can be achieved by a double ...
    • Displacement of liquid in pipe flow: Two-dimensional simulations 

      Worren, Helene Ingeborg Kleiven (Master thesis, 2012)
      In the oil and gas industries it is crucial to handle flow assurance in a good manner in order to ensure a safe and economical operation. In subsea areas there are challenging conditions, with high pressure and low ...
    • Dynamic model of a small scale concentrating solar cooker with rock bed heat storage 

      Nyeinga, Karidewa; Nydal, Ole Jørgen; Okello, Denis; Banda, Eldad John K.B. (Peer reviewed; Journal article, 2016)
      This study presents a dynamic model for a concen-trating solar energy collector with an integrated rockbed heat storage system. The model is based onnumerical integration of a set of conservation equa-tions for mass, ...
    • Dynamic two phase flow models for flushing 

      Rahbari, Ahmadreza (Master thesis, 2014)
      This thesis aims at modeling the separated liquid-liquid flows with application for flushing. In the beginning, there will be a short review of the governing equations and the fundamental concepts used in this thesis. Two ...
    • Efficient Numerical Methods for Waves in One-Dimensional Two-Phase Pipe Flows 

      Akselsen, Andreas Holm (Doctoral thesis at NTNU;2016:207, Doctoral thesis, 2016)
      This thesis is aimed at improving simulation efficiency for stratified-wavy gasliquid flows. Towards this goad, the simpler nature of incompressible two-phase flows is utilized for predicting hydraulic wave dynamics, ...
    • Eksperimentell undersøkelse av faseinversjon for olje-vann systemer 

      Lamberg, Håvard (Master thesis, 2010)
      Denne rapporten fokuserer på en eksperimentell undersøkelse av fase inversjon for olje-vann blandinger. Undersøkelsen har blitt utført ved batch forsøk og direkte strømnings forsøk (uten å øke den dispergerte fasen), og ...
    • Eksperimentell undersøkelse av faseinversjon for olje-vann systemer. 

      Tysnes, Anders Nilsen (Master thesis, 2010)
      Denne rapporten fokuserer på en eksperimentell undersøkelse av fase inversjon for olje-vann blandinger. Undersøkelsen har blitt utført ved batch forsøk og direkte strømnings forsøk (uten å øke den dispergerte fasen), og ...
    • Evaluation of a Flow Simulator for Multiphase Pipelines 

      Jansen, Jeppe Mathias (Master thesis, 2009)
      This thesis concerns the terrain slugging capabilities of LedaFlow; it is showed that LedaFlow is indeed able to simulate terrain slugging type 1 and 2 in a S-riser geometry with air and water at atmospheric conditions, ...
    • Expansion driven Unstable Two Phase Flows in Long Risers and Wells 

      Kanu, Elizabeth (Master thesis, 2011)
      Flow instabilities in long wells and risers under certain flow conditions, is well known. Expansion driven flow instability (EDI) which is relatively little known, refers to occurrence of flow instabilities in long wells ...
    • An experimental investigation of multiphase gas-liquid pipe flow at low liquid loading 

      Chupin, Gaël (Dr.ing;2003:83, Doctoral thesis, 2003)
      In this thesis, the co-current flow of gas, oil and water in pipes has been studied at low input liquid loading. Despite the frequent occurrence of low liquid loaded gas flow in pipes involved in the production of gas ...