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Numerical Implementation and Evaluation of a Set of Population Balance Breakage Closures
(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 Investigation of the Pressure Drop Characteristics of Isothermal Ice Slurry Flow under Variable Ice Particle Diameter
(Peer reviewed; Journal article, 2020)Ice slurry is an advanced secondary refrigerant that has been attracting considerable attention for the past decade due to the growing concerns regarding energy shortage and environmental protection. To stimulate the ... -
Numerical Study of Mass Transfer Limitations in a Bioreactor Operated in the Heterogeneous Flow Regime
(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, ... -
The O-factor: using the H-factor concept to predict the outcome of organosolv pretreatment
(Peer reviewed; Journal article, 2021)The H-factor, a parameter used extensively to analyze and predict the outcome of kraft pulping, is applied to organosolv pretreatment. The total solid yield after organosolv pretreatment fits well with the H-factor. The ... -
Offshore Gas-to-Liquid Production
(Master thesis, 2013)Gas-to-liquid (GTL) production technology is a process by which associated natural gas is chemically converted into liquid products, such as liquefied natural gas (LNG), methanol and liquid transportation fuels. The process ... -
Oil-in-Water Emulsions Stabilized by Cellulose Nanofibrils—The Effects of Ionic Strength and pH
(Journal article; Peer reviewed, 2019)Pickering o/w emulsions prepared with 40 wt % rapeseed oil were stabilized with the use of low charged enzymatically treated cellulose nanofibrils (CNFs) and highly charged 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized ... -
On combining self-optimizing control and extremum-seeking control - Applied to an ammonia reactor case study
(Journal article; Peer reviewed, 2019) -
On intermetallic phases formed during interdiffusion between aluminium alloys and stainless steel
(Peer reviewed; Journal article, 2022)One of the major challenges in welding of aluminium (Al) alloys and steels is the growth of brittle intermetallic phases, which depends on the thermomechanical processing history and the alloying elements. This work focuses ... -
On the Durability of Protective Titania Coatings on High-Voltage Spinel Cathodes
(Peer reviewed; Journal article, 2022)TiO2-coating of LiNi0.5-xMn1.5+xO4 (LNMO) by atomic layer deposition (ALD) has been studied as a strategy to stabilize the cathode/electrolyte interface and mitigate transition metal (TM) ion dissolution. The TiO2 coatings ... -
On the effect of the approach velocity on the coalescence of fluid particles
(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 interfacial roughness scale in turbulent stratified two-phase flow: 3D lattice Boltzmann numerical simulations with forced turbulence and surfactant
(Journal article; Peer reviewed, 2015)Numerical 3D simulations of turbulent, stratified two-phase shear flow with a surfactant laden interface were used to test and develop a phenomenological interfacial roughness scale model where the energy required to deform ... -
On the nature of Pt-carbon interactions for enhanced hydrogen generation
(Peer reviewed; Journal article, 2020)Understanding the metal-support interactions in heterogeneous catalysis is critical yet complicated to tailor-design the catalysts with desirable properties. Exemplified with Pt-catalyzed ammonia borane (AB) hydrolysis, a ... -
On the role of the surface rheology in film drainage between fluid particles
(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
(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 ... -
On-Line PI Controller tuning Using Closed-Loop Setpoint Response
(Journal article; Peer reviewed, 2010)The proposed method is similar to the Ziegler-Nichols (1942) tuning method, but it is faster to use and does not require the system to approach instability with sustained oscillations. The method requires one closed-loop ... -
Once-Through Gas-to-Liquid Process Concept for Offshore Applications
(Master thesis, 2015)The worlds energy demand is increasing, and at the same time the amount of easily accessible oil is reduced. Associated gas for most off-shore applications are flared or injected in the reservoir due to transportation ... -
One-pot catalytic vinyl chloride (VCM) production
(Master thesis, 2019)Målet med denne tesen var å syntetisere metallfrie katalysatorer for ett-steg syntese av vinylkloridmonomer (VCM), samt videre studie av katalysatorene ved bruk av ulike karakteriseringsteknikker som N2-fysisorbsjon, Raman ... -
One-pot conversion of biomass to chemicals
(Master thesis, 2017)One-pot conversion of biomass to diols can be a simple and fast alternative to other methods of biomass conversion. The catalyst for this conversion is required to be bifunctional, catalysing both hydrogenation and retro-aldol ... -
One-pot Conversion of Biomass to Chemicals on Ni-Cu/ZnO Based Catalysts
(Master thesis, 2015)Optimization of the one-pot hydrothermal reaction of cellulose to polyols have been investigated. Ni-Cu-ZnO catalysts supported by carbon nanotubes (CNT) with varying nickel (Ni) and copper (Cu) mole ratio was synthesized ... -
One-Pot Conversion of Cellulose to Ethylene Glycol and Propylene Glycol over Nickel Zinc Oxide Catalysts with CNT Support
(Master thesis, 2013)Ni-Zn oxide catalysts with CNT support were prepared by the pechini method, and evaluated for the conversion of cellulose to polyols. The catalysts were characterized by XRD, SEM/TEM, N2 adsorption, temperature programmed ...