Blar i NTNU Open på forfatter "Jakobsen, Hugo Atle"

A multifluidPBE model for reactive bubbly flow: Applied to biofuel production via the Fischer Tropsch synthesis operated in a slurry bubble column
Vik, Camilla Berge (Doktoravhandlinger ved NTNU;2018:291, Doctoral thesis, 2018)Summary of thesis: A multifluidPBE model for reactive bubbly flow Although electricity is transforming the transportation sector, liquid fuels are believed to remain in demand in the near future. With the ... 
A multifluidPBE model for simulation of mass transfer limited processes operated in bubble columns
Vik, Camilla Berge; Solsvik, Jannike; Hillestad, Magne; Jakobsen, Hugo Atle (Journal article, 2017)Modeling of reactive dispersed flows with interfacial mass transfer limitations require an accurate description of the interfacial area, mass transfer coefficient and the driving force. The driving force is given by the ... 
Determination of Breakage Parameters in Turbulent FluidFluid Breakage
Herø, Eirik Helno; Forgia, Nicolas La; Solsvik, Jannike; Jakobsen, Hugo Atle (Journal article; Peer reviewed, 2019)Numerous sets of single‐particle breakage experiments are required in order to provide a sufficient database for improving the modeling of fluid particle breakage mechanisms. This work focuses on the interpretation of the ... 
Dissipation rate estimation in a rectangular shaped test section with periodic structure at the walls
La Forgia, Nicolas; Herø, Eirik Helno; Solsvik, Jannike; Jakobsen, Hugo Atle (Journal article; Peer reviewed, 2018)An experimental study of turbulent flow concerning the characterization of turbulence by twopoint correlation and estimations of the turbulent dissipation rate is presented. The fluid used is deionized water and the test ... 
An hpadaptive quadrature method for irregular integrands: Application to the population balance equation birth term
Engh, Mathias; Solsvik, Jannike; Jakobsen, Hugo Atle (Peer reviewed; Journal article, 2019)The solution of the population balance equation requires the integration of several source terms. In the numerical weighted residuals methods, Gaussian quadrature is a natural candidate for numerical integration. Previous ... 
Interfacial mass transfer limitations in the FischerTropsch synthesis operated in a slurry bubble column at industrial conditions
Vik, Camilla Berge; Solsvik, Jannike; Hillestad, Magne; Jakobsen, Hugo Atle (Journal article; Peer reviewed, 2018)At high catalyst volume fractions the FischerTropsch synthesis (FTS) operated in a slurry bubble column (SBC) is driven into the mass transfer limited regime. This study utilized literature models for the gasliquid mass ... 
Interfacial mass transfer limitations of the FischerTropsch synthesis operated in a slurry bubble column reactor at industrial conditions
Vik, Camilla Berge; Solsvik, Jannike; Hillestad, Magne; Jakobsen, Hugo Atle (Journal article; Peer reviewed, 2018)At high catalyst volume fractions the FischerTropsch synthesis (FTS) operated in a slurry bubble column (SBC) is driven into the mass transfer limited regime. This study utilized literature models for the gasliquid mass ... 
Mass Transfer Coefficients and Bubble Sizes in Oxidative Ladle Refining of Silicon
Bjørnstad, Erlend Lunnan (Master thesis, 2016)The mass transfer of [Al] and [Ca] between three synthetic SiO_{2}CaOAl_{2}O_{3} slags, and 8N silicon, has been investigated to find the overall mass transfer coefficient k_{i,t} for the individual species. Samples were ... 
Measuring gasliquid mass transfer in very small bubbles
Kindsbækken, Fredrik (Master thesis, 2018)Modern industry is always striving for process optimization and reducing emissions, which in many cases requires an accurate modeling of interfacial gasliquid mass transfer. To study the interfacial gasliquid mass ... 
Modeling and Simulation of Chemical Looping Combustion Using a CopperBased Oxygen Carrier in a DoubleLoop Circulating Fluidized Bed Reactor System
Zhang, Yuanwei; Langørgen, Øyvind; Saanum, Inge; Chao, Zhongxi; Jakobsen, Hugo Atle (Journal article; Peer reviewed, 2017)In this work, a computational fluid dynamics simulator has been developed for a novel doubleloop circulating fluidized bed reactor which is used for a chemical looping combustion process. The simulator is implemented in ... 
Modelling and simulation of chemical looping combustion process in a double loop circulating fluidized bed reactor
Zhang, Yuanwei; Chao, Zhongxi; Jakobsen, Hugo Atle (Journal article, 2017)A reactive CFD model has been developed and implemented numerically in an inhouse code for a coupled double loop circulation fluidized bed reactor. In the current work it is utilized for the chemical looping combustion ... 
Modelling and simulation of hydrodynamics in double loop circulating fluidizedbed reactor for chemical looping combustion process
Zhang, Yuanwei; Chao, Zhongxi; Jakobsen, Hugo Atle (Journal article, 2017)A multiphase CFD model has been developed and implemented in an inhouse code for a coupled double loop circulation fluidized bed (DLCFB) reactor which can be utilized for the chemical looping combustion process. The air ... 
Numerical Implementation and Evaluation of a Set of Population Balance Breakage Closures
Skjervold, Vidar Torarin (Master thesis, 2016)The population balance equation (PBE) can be used to model multiphase processes, where one or more dispersed phases are distributed in a continuous medium. In such systems, the interfacial area is an important quantity, ... 
Numerical Study of Mass Transfer Limitations in a Bioreactor Operated in the Heterogeneous Flow Regime
Kure, Ida Kristine (Master thesis, 2017)With the increased focus on detaining a more environmental friendly industry, biological processes have been given more attention over the last years. Such a biological process is single cell protein (SCP) production, ... 
On the effect of the approach velocity on the coalescence of fluid particles
Ozan, Suat Canberk; Jakobsen, Hugo Atle (Journal article; Peer reviewed, 2019)The effect of the constant relative approach velocity of two Newtonian fluid particles on their coalescence is investigated via a film drainage model. The interfaces are deformable and allowed to have any degree of mobility. ... 
On the role of the surface rheology in film drainage between fluid particles
Ozan, Suat Canberk; Jakobsen, Hugo Atle (Journal article; Peer reviewed, 2019) 
On the Solution of the Pellet and Reactor Model for the Steam Methane Reforming Process Using the Methods of Weighted Residuals
Tangen, Stian (Master thesis, 2012)The purpose of the thesis is to prove that the mole based formulation of a pellet model simulating the steam methane reforming reaction is identical to the novel mass based formulation. To prove this, the numerical methods ... 
Optimization of the Numerical Solution of the Population Balance Equation
Engh, Mathias (Master thesis, 2016)The population balance equation (PBE) is a frequently applied equation in the modeling of multiphase reactors. Accurate solution of the PBE is important in order to have a precise estimate of the interfacial area, which ... 
"The numerical Solver BVP5c tested on AdvectionDiffusion Equations in a Chemical Reactor Model."
Larsen, Sunniva Bang (Master thesis, 2010)This thesis will consider the modeling of a fixed bed multi tube reactor  in a numerical perspective. To do this, the adaptive boundary value solver BVP5c is investigated as a possible contribution to the modeling picture. ...