Browsing Institutt for energi og prosessteknikk by Title
Now showing items 3880-3899 of 4147
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Turbulent Couette–Poiseuille flow with zero wall shear
(Journal article, 2017)A particular pressure-driven flow in a plane channel is considered, in which one of the walls moves with a constant speed that makes the mean shear rate and the friction at the moving wall vanish. The Reynolds number ... -
Turbulent shear flows subject to system rotation
(Doktoravhandlinger ved NTNU, 1503-8181; 2009:187, Doctoral thesis, 2009)Turbulent flows in rotating frame-of-reference are of considerable interest in a variety of industrial, geophysical and astrophysical applications. In these flows, the system rotation induces additional body forces, i.e. ... -
Turbulent wake behind a concave curved cylinder
(Journal article; Peer reviewed, 2019)We present a detailed study of the turbulent wake behind a quarter-of-ring curved cylinder at Reynolds number Re = 3900 (based on cylinder diamter and incoming ow velocity), by means of Direct Numerical Simulation (DNS). ... -
Two routes for sonochemical synthesis of platinum nanoparticles with narrow size distribution
(Journal article; Peer reviewed, 2021)A novel sonochemical approach to synthesize platinum (Pt) nanoparticles has been developed to produce smaller, and more monodisperse particles than traditional chemical reduction methods such as the sodium borohydride ... -
Two-fluid CFD model for R744 two-phase ejectors
(Chapter, 2020)This paper presents early results from a novel two-fluid Eulerian-Eulerian multiphase model for R744 two-phase ejectors, which to the authors knowledge has not previously been presented in literature. As opposed to previous ... -
Two-phase Flow Distribution in Heat Exchanger Manifolds
(Doktoravhandlinger ved NTNU, 1503-8181; 2004:1, Doctoral thesis, 2004)The current study has investigated two-phase refrigerant flow distribution in heat exchange manifolds. Experimental data have been acquired in a heat exchanger test rig specially made for measurement of mass flow rate and ... -
TWO-PHASE FLOW INSTABILITIES AND FLOW MAL-DISTRIBUTION IN PARALLEL CHANNELS
(Doktoravhandlinger ved NTNU, 1503-8181; 2013:245, Doctoral thesis, 2013)Boiling flow instabilities are present in several heat exchanging systems, covering different applications and scales. Two–phase flow unstable phenomena can take place in nuclear reactors, cryogenic and chemical processes ... -
Two-phase Flow Instabilities during Flow Boiling and Control of Wettability by Micro-structured Surfaces
(Doctoral theses at NTNU;2018:245, Doctoral thesis, 2018)Boiling heat transfer is of relevance in a variety of applications in power and process industries. In spite of the vast research performed in the last decades, fundamental questions about mechanisms related to the boiling ... -
Two-Phase pipeflow simulations with OpenFoam
(Master thesis, 2013)The main purpose of this thesis is to develop two-phase simulations using OpenFOAM. Two different situations are studied: open and closed channel flow. Different parameters are changed in each case to obtain different ... -
Two-stage evaporator for R744 heat pumps using greywater as heat source
(Peer reviewed; Journal article, 2023)Heat pumps are pinpointed as a key technology in decarbonizing buildings' heat supply, which is currently dominated by fossil-fuel based systems. To minimize the environmental impact of heat pumps over their lifetime, ... -
Two-way coupled fluid-structure interaction of gas-liquid slug flow in a flexible riser: Small-scale experiments and simulations
(Journal article; Peer reviewed, 2019)Flexible risers might be subjected to large pressure and density fluctuations when transporting multiphase mixtures as different flow patterns may take place. Those fluctuations might induce large forces on the structure, ... -
Two-way coupled simulation of the Francis-99 hydrofoil using model order reduction
(Journal article; Peer reviewed, 2019)The Francis-99 hydrofoil is simulated using a quasi two-way Fluid-Structure Interaction procedure. The structural domain is reduced by the use of modal decomposition, and solved for inside the commercial fluid solver ANSYS ... -
Typologier for norske boligbygg - Eksempler på tiltak for energieffektivisering
(Research report, 2016)Denne rapporten presenterer en såkalt typologi-brosjyre for norske boligbygg med vekt på å vise effekter av tiltak for energieffektivisering i typiske norske boligbygg. Arbeidet er utført innen rammene av prosjektet EPISCOPE ... -
Ultra-high surface area and mesoporous N-doped carbon derived from sheep bones with high electrocatalytic performance toward the oxygen reduction reaction
(Journal article; Peer reviewed, 2017)A nitrogen (N)-doped mesoporous carbon material exhibiting ultra-high surface area was successfully synthesized from sheep bones via a facile and low-cost method. The obtained carbon material had an ultra-high specific ... -
An Ultra-Low Temperature Transcritical R744 Refrigeration System for Future Detectors at CERN LHC
(Peer reviewed; Journal article, 2021)The cooling systems of the future tracking detectors of the ATLAS and CMS experiments at the Large Hadron Collider (LHC) at CERN will be entirely based on CO2 refrigeration technology. The system is a booster refrigeration ... -
Ultra-Low-Temperature Refrigeration Systems: A Review and Performance Comparison of Refrigerants and Configurations
(Peer reviewed; Journal article, 2023)During the last decade, many industrial and medical applications have shown a requirement for low-temperature-cooling usage (from −40 to −80 °C), which cannot be efficiently obtained via the conventional refrigeration ... -
Uncertainty in multiphase flow estimates for a field development case
(Master thesis, 2013)Commercial multiphase flow simulators typically give one value for each output parameter simulated in a pipeline. Field development project managers want to know the uncertainty in these predictions in order to assess the ... -
Uncertainty of the allocation factors of heat and electricity production of combined cycle power plant
(Journal article; Peer reviewed, 2015)There are many different methods for the allocation of CO2 emissions in Combined Heat and Power plants. The choice of allocation method has a great effect on energy pricing and CO2 allocation in Combined Heat and Power ... -
Understanding Energy Conversion in Combustion
(Master thesis, 2021)I dette prosjektet har tre forskjellige modeller for flammer blitt undersøkt: forblandet velblandet reaktor, forblandet fritt-spredene flamme, og ikke-forblandet motstrøms flamme. Målet med prosjekter var å først bestemme ... -
Understanding GHG emissions from Swedish consumption - Current challenges in reaching the generational goal
(Journal article; Peer reviewed, 2019)The Swedish generational goal is a unique initiative governing all Swedish environmental policy, aiming at solving all major domestic environmental problems for the next generation without increasing environmental damage ...