Browsing SINTEF Open by Author "Wilhelmsen, Øivind"
Now showing items 1-20 of 36
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Accurate quantum-corrected cubic equations of state for helium, neon, hydrogen, deuterium and their mixtures
Aasen, Ailo; Hammer, Morten; Lasala, Silvia; Jaubert, Jean-Noël; Wilhelmsen, Øivind (Peer reviewed; Journal article, 2020)Cubic equations of state have thus far yielded poor predictions of the thermodynamic properties of quantum fluids such as hydrogen, helium and deuterium at low temperatures. Furthermore, the shape of the optimal α functions ... -
Chemical Potential Differences in the Macroscopic Limit from Fluctuations in Small Systems
Bråten, Vilde; Wilhelmsen, Øivind; Schnell, Sondre Kvalvåg (Peer reviewed; Journal article, 2021)We present a new method for computing chemical potential differences of macroscopic systems by sampling fluctuations in small systems. The small system method, presented by Schnell et al. [Schnell et al., J. Phys. Chem. ... -
Choice of reference, influence of non-additivity and present challenges in thermodynamic perturbation theory for mixtures
Hammer, Morten; Aasen, Ailo; Ervik, Åsmund; Wilhelmsen, Øivind (Journal article; Peer reviewed, 2020) -
Choked liquid flow in nozzles: crossover from heterogeneous to homogeneous cavitation and insensitivity to depressurization rate
Wilhelmsen, Øivind; Aasen, Ailo (Journal article; Peer reviewed, 2021)The critical mass flow rate is the maximum flow rate that can pass through a constrained geometry such as a nozzle. For liquid CO2, it has been shown that homogeneous relaxation models systematically underpredict the ... -
CO2Mix Project: Experimental Determination of Thermo Physical Properties of CO2-Rich Mixtures
Løvseth, Sigurd Weidemann; Skaugen, Geir; Stang, Hans Georg Jacob; Jakobsen, Jana Poplsteinova; Wilhelmsen, Øivind; Span, Roland; Wegge, Robin (Peer reviewed; Journal article, 2013)The CO2Mix project is established in order to fill important knowledge gaps regarding thermophysical properties of CO2-rich mixtures relevant for CCS conditioning and transport. Even small amounts of impurities can have a ... -
A combined fluid-dynamic and thermodynamic model to predict the onset of rapid phase transitions in LNG spills
Lervåg, Karl Yngve; Skarsvåg, Hans Langva; Aursand, Eskil; Ouassou, Jabir Ali; Hammer, Morten; Reigstad, Gunhild Allard; Ervik, Åsmund; Fyhn, Eirik Holm; Gjennestad, Magnus Aashammer; Aursand, Peder; Wilhelmsen, Øivind (Peer reviewed; Journal article, 2020)Transport of liquefied natural gas (LNG) by ship occurs globally on a massive scale. The large temperature difference between LNG and water means LNG will boil violently if spilled onto water. This may cause a physical ... -
Combined temperature and RI sensor for exploring the phase transitions of ethanol solutions
Wahl, Markus Solberg; Wilhelmsen, Øivind; Hjelme, Dag Roar (Optics InfoBase Conference Papers;OSF2018, Chapter; Peer reviewed, 2018)A fiber optic interferometer based on core diameter mismatch is used in reflection mode to study the behavior of ethanol solutions with regards to concentration dependent thermal properties and phase transitions. A method ... -
Comparing exergy losses and evaluating the potential of catalyst-filled plate-fin and spiral-wound heat exchangers in a large-scale Claude hydrogen liquefaction process
Skaugen, Geir; Berstad, David Olsson; Wilhelmsen, Øivind (Journal article; Peer reviewed, 2020)Detailed heat exchanger designs are determined by matching intermediate temperatures in a large-scale Claude refrigeration process for liquefaction of hydrogen with a capacity of 125 tons/day. A comparison is made of ... -
Cryogenic CO2 condensation and membrane separation of syngas for large-scale LH2 production.
Berstad, David Olsson; Wilhelmsen, Øivind; Skjervold, Vidar T.; Nekså, Petter (Science et technique du froid;2017-3, Chapter; Peer reviewed, 2017) -
Dissecting the exergy balance of a hydrogen liquefier: Analysis of a scaled-up claude hydrogen liquefier with mixed refrigerant pre-cooling
Berstad, David Olsson; Skaugen, Geir; Wilhelmsen, Øivind (Peer reviewed; Journal article, 2020)For liquid hydrogen (LH2) to become an energy carrier in energy commodity markets at scales comparable to for instance LNG, liquefier capacities must be scaled up several orders of magnitude. While state-of-the-art liquefiers ... -
Electrodialysis in Hydrometallurgical Processes
Zimmermann, Pauline; Tekinalp, Önder; Deng, Liyuan; Forsberg, Kerstin; Wilhelmsen, Øivind; Burheim, Odne Stokke (The Minerals, Metals & Materials Series;2020, Chapter; Peer reviewed, 2020)Electrodialysis (ED) is an ionic exchange membrane process for separation of different components and species. In desalination, a large part of the energy is used to sustain a concentration difference between the solutions, ... -
Energy efficient design of membrane processes by use of entropy production minimization
Magnanelli, Elisa; Wilhelmsen, Øivind; Johannessen, Eivind; Kjelstrup, Signe (Journal article; Peer reviewed, 2018) -
Equation of state and force fields for Feynman-Hibbs-corrected Mie fluids. II. Application to mixtures of helium, neon, hydrogen and deuterium
Aasen, Ailo; Hammer, Morten; Müller, Erich; Wilhelmsen, Øivind (Peer reviewed; Journal article, 2020)We extend the statistical associating fluid theory of quantum corrected Mie potentials (SAFT-VRQ Mie), previously developed for pure fluids [Aasen et al., J. Chem. Phys. 151, 064508 (2019)], to fluid mixtures. In this ... -
Equation of state and force fields for Feynman–Hibbs-corrected Mie fluids. I.Application to pure helium, neon, hydrogen, and deuterium
Aasen, Ailo; Hammer, Morten; Ervik, Åsmund; Müller, Erich A.; Wilhelmsen, Øivind (Journal article; Peer reviewed, 2019)We present a perturbation theory that combines the use of a third-order Barker–Henderson expansion of the Helmholtz energy with Miepotentials that include first- (Mie-FH1) and second-order (Mie-FH2) Feynman–Hibbs quantum ... -
Estimating metastable thermodynamic properties by isochoric extrapolation from stable states
Aasen, Ailo; Hammer, Morten; Reguera, David; Wilhelmsen, Øivind (Peer reviewed; Journal article, 2024)The description of metastable fluids, those in local but not global equilibrium, remains an important problem of thermodynamics, and it is crucial for many industrial applications and all first order phase transitions. One ... -
Evaluation of SPUNG* and Other Equations of State for Use in Carbon Capture and Storage Modelling
Wilhelmsen, Øivind; Skaugen, Geir; Jørstad, Oddvar; Li, Hailong (Journal article; Peer reviewed, 2012)In this work, Equations of State (EoS) relevant for carbon capture and storage modelling have been evaluated for pure CO2 and CO2-mixtures with particular focus on the extended corresponding state approach, SPUNG/SRK. Our ... -
Exploring the potential for waste heat recovery during metal casting With thermoelectric generators: On-site experiments and mathematical modelling
Børset, Marit Takla; Wilhelmsen, Øivind; Kjelstrup, Signe; Burheim, Odne Stokke (Journal article; Peer reviewed, 2016) -
A flexible and robust modelling framework for multi-stream heat exchangers
Skaugen, Geir; Kolsaker, Kjell; Walnum, Harald Taxt; Wilhelmsen, Øivind (Peer reviewed; Journal article, 2013)Heat exchangers are important units in most industrial processes. They involve physical phenomena such as condensation and evaporation including several boiling regimes. Different types of heat exchangers constructed for ... -
Heat transport through a solid-solid junction: the interface as an autonomous thermodynamic system
Rurali, R.; Colombo, L.; Cartoixà, X.; Wilhelmsen, Øivind; Trinh, Thuat; Bedeaux, Dick; Kjelstrup, Signe (Journal article; Peer reviewed, 2016) -
Heat transport through a solid-solid junction: the interface as an autonomous thermodynamic system
Rurali, R.; Colombo, L.; Cartoixà, X.; Wilhelmsen, Øivind; Trinh, Thuat; Bedeaux, Dick; Kjelstrup, Signe (Journal article; Peer reviewed, 2016)