Browsing Institutt for energi og prosessteknikk by Title
Now showing items 2793-2812 of 4152
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Oil-free turbocompressors for CO2 as working fluid
(Doktoravhandlinger ved NTNU, 1503-8181; 2013:299, Doctoral thesis, 2013)Compressing equipment can be found in almost every area of our industrialized society. Compressors drive our fridges, air conditioning systems and enable turbine engines to propel the aircrafts we use when going for holidays ... -
Olje-vann separasjon i rør
(Master thesis, 2012)Transiente motstrøms tyngdekrafts-drevne olje-vann strømningsforsøk ble gjort i en to meter lang lukket plexiglass sylinder. Et enkelt eksperimentelt oppsett baser på visuelle observasjoner ble laget med formål for disse ... -
Olje-vann separasjon i rør
(Master thesis, 2012)Transiente motstrøms tyngdekrafts-drevne olje-vann strømningsforsøk ble gjort i en to meter lang lukket plexiglass sylinder. Et enkelt eksperimentelt oppsett baser på visuelle observasjoner ble laget med formål for disse ... -
On exergy analysis of industrial plants and significance of ambient temperature
(Doktoravhandlinger ved NTNU, 1503-8181; 2011:80, Doctoral thesis, 2011)The exergy analysis has been a relatively mature theory for more than 30 years. However, it is not that developed in terms of procedures for optimizing systems, which partly explains why it is not that common. Misconceptions ... -
On Flywheel Batteries
(Bachelor thesis, 2023)Energilagringssystemer forbedrer effektiviteten i elektriske systemer under ubalanser mellom tilbud og etterspørsel, og bidrar til å øke nettverkets stabilitet og kvalitet. De reduserer ujevnheten i fornybar energiproduksjon ... -
On heat transfer in Bödewadt flow
(Journal article, 2017)Heat transfer in revolving Bo¨dewadt flow above a planar surface has been considered. We have shown that a similarity solution of the thermal energy problem does not exist as long as the surface is impermeable. The failure ... -
On interface transfer terms in two-fluid models
(Journal article; Peer reviewed, 2012)In this note we consider two-fluid models based on the usual formulations for conservation of mass, total momentum and total energy. We present some potentially useful general relationships between the interface exchange ... -
On isotropic turbulence in the dark fluid universe
(Journal article; Peer reviewed, 2011)As a first part of this work, experimental information about the decay of isotropic turbulence in ordinary hydrodynamics, is used as input in FRW equations in order to investigate how an initial fraction f of turbulent ... -
On Mathematical Modeling and Numerical Simulation of Chemical Kinetics in Turbulent Lean Premixed Combustion
(Doktoravhandlinger ved NTNU, 1503-8181; 2011:206, Doctoral thesis, 2011)This thesis investigates turbulent reacting lean premixed flows with detailed treatment of the chemistry. First, the fundamental equations which govern laminar and turbulent reacting flows are presented. A perfectly stirred ... -
On mathematical modelling and mumerical simulation of transient compressible flow across open boundaries
(Dr. ingeniøravhandling, 0809-103X; 2003:73, Doctoral thesis, 2003)In numerical simulations of turbulent reacting compressible flows, artificial boundaries are needed to obtain a finite computational domain when an unbounded physical domain is given. Artificial boundaries which fluids are ... -
On Numerical Simulation of Turbulent Flows and Combustion
(Doktoravhandlinger ved NTNU, 1503-8181; 2014:76, Doctoral thesis, 2014)The goal of the present doctoral thesis was to develop a turbulence-chemistry interaction model for turbulent combustion simulations for high Reynolds number flows of practical interest. Present simulations were carried ... -
On particle transport and turbulence in wellbore flows of non-Newtonian fluids - Findings from a cuttings transport process analysis by means of computational fluid dynamics, rheometry, and dimensional analysis
(Doctoral theses at NTNU;2020:95, Doctoral thesis, 2020)Cuttings transport modeling was analyzed with a major focus on three dimensional (3D) Computational Fluid Dynamics (CFD) approaches including rheometry and to a lesser extent on one-dimensional modeling and dimensional ... -
On solutions to equilibrium problems for systems of stiffened gases
(Journal article; Peer reviewed, 2011)We consider an isolated system of N immiscible fluids, each following a stiffened-gas equation of state. We consider the problem of calculating equilibrium states from the conserved fluid-mechanical properties, i.e., the ... -
On Soot Sampling: Considerations when Sampling for TEM Imaging and Differential Mobility Spectrometer
(Journal article; Peer reviewed, 2019)Particulate matter (PM) has been sampled from a compression ignition engine using a differential mobility spectrometer (Cambustion DMS 500) and for imaging in a transmission electron microscope (TEM) with the aim of coupling ... -
On the choice of closure complexity in anisotropic drag closures for filtered Two Fluid Models
(Peer reviewed; Journal article, 2019)Filtered Two Fluid Models (fTFMs) aim to enable accurate industrial-scale simulations of fluidized beds by means of closures accounting for the effects of bubbles and clusters. The present study aims to improve anisotropic ... -
On The Development of a Counter-Flow Mixing Reactor for Fast Hydrothermal Liquefaction
(Peer reviewed; Journal article, 2022)A laboratory-scale continuous tubular flow reactor system has been developed for fast HTL (hydrothermal liquefaction) of lignin, adopting the nozzle reactor concept with a counter-flow mixing design. The reactor is capable ... -
On the Effect of Boundary Conditions on the Flow around a Cylinder in a Channel
(Chapter, 2015)In this paper, the incompressible external flow around an offshore drilling riser with fairings at Reynolds number 5000 is used to study the effects of varying boundary conditions in numerical simulations. We use a direct ... -
On the effect of wicking on the droplet cooling
(Master thesis, 2018)Several thermal management applications operating at low temperatures require the liquid to spread as much as fast as possible in order to improve the cooling performance. Due to the recent progresses in micro/nano technology, ... -
On the exergy efficiency of CO<inf>2</inf> capture: The relation between sub-process and overall efficiencies
(Peer reviewed; Journal article, 2023)A generic exergy targeting tool for gas separation processes is developed, which is applicable to any defined boundary conditions for incoming feed gas as well as delivered separation products. Whereas targeting tools in ... -
On the financial balance of input–output constructs: revisiting an axiomatic evaluation
(Journal article; Peer reviewed, 2016-04-11)Financial balance is fundamental to input–output analysis (IO), andconsequently the respect of this balance is one of the dominant criteria inevaluating IO constructs. Kop Jansen and ten Raa (1990) proved that ...