Browsing Institutt for energi og prosessteknikk by Document Types "Doctoral thesis"
Now showing items 41-60 of 360
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Boiling and Condensation Heat Transfer of Zeotropic Mixtures in Smooth Tubes
(Doctoral thesis at NTNU;2016:330, Doctoral thesis, 2016)Boiling and condensation of mixtures are widely encountered in liquefaction of natural gas process, refrigeration systems, and other chemical and power generation industries. Zeotropic mixtures present a temperature glide ... -
Building design strategy for cold climate using passive design and renewable technologies
(Doctoral theses at NTNU;2017:168, Doctoral thesis, 2017)This thesis presents an analysis of various measures and technologies leading to establishing a strategy to achieve energy efficiency in buildings, particularly in the context of Kazakhstan. The developed strategies can ... -
Bulk and interfacial thermodynamics of mixtures: From aqueous systems to ultracryogenic fluids
(Doctoral theses at NTNU;2020:38, Doctoral thesis, 2020) -
Calculation of interface curvatures with the level-set method for two-phase flow simulations and a second-order diffuse-domain method for elliptic problems in complex geometries
(Doktoravhandlinger ved NTNU, 1503-8181; 2013:214, Doctoral thesis, 2013)This thesis considers in the first part the mathematical modelling of incompressible two-phase flow, in particular the calculation of interface curvatures and normal vectors with the level-set method. The main contribution ... -
A Cartesian Cut-Cell Methodology, Applied to Large Scale Interface Dynamics and Wave Impacts Spray Formation
(Doctoral theses at NTNU;2020:277, Doctoral thesis, 2020)The present thesis focus on developing numerical methods that can resolve various problems in computational fluid dynamics. The Cartesian cut-cell method is used to solve continuity and momentum equations. The method will ... -
Cartesian Grid Method for Compressible Flow Simulation
(Doctoral Theses at NTNU, 1503-8181; 2012:85, Doctoral thesis, 2012)The Cartesian grid method is an alternative to the existing methods to solve a physical problem governed by partial differential equations (PDEs) computationally. Researchers are interested in this method due to its ... -
Catalytic conversion of biomass to produce higher quality liquid bio-fuels
(Doktoravhandlinger ved NTNU, 1503-8181; 2005:187, Doctoral thesis, 2005) -
CFD Modelling for Improved Components in CO2 and Ammonia Vapour Compression Systems
(Doctoral theses at NTNU;2023:180, Doctoral thesis, 2023)Refrigeration and heat-pumping systems are shifting to natural, environmentallyfriendly refrigerants like CO2 to combat global warming. Ejectors are often used in these systems for expansion work recovery to enhance ... -
Characteristics of reversible-pump turbines
(Doktoravhandlinger ved NTNU, 1503-8181; 2012:301, Doctoral thesis, 2012)The primary goal for this PhD project has been to investigate instability of reversiblepump turbines (RPTs) as a phenomenon and to find remedies to solve it. The instability occurs for turbines with s-shaped characteristics, ... -
Chemical and Process Integration for Environmental Assessment – Development and Evaluation of a Chemical Recycling Concept for Plastic Waste
(Doktoravhandlinger ved NTNU, 1503-8181; 2007:106, Doctoral thesis, 2007)The thesis focuses on systems oriented methods in conceptual design and analysis of chemical processes, both with respect to environmental performance. The areas of process synthesis and process systems engineering offer ... -
Chemical looping combustion : fuel conversion with inherent CO2 capture
(Doktoravhandlinger ved NTNU, 1503-8181; 2005:2, Doctoral thesis, 2005)Chemical looping combustion (CLC) is a new concept for fuel energy conversion with CO2 capture. In CLC, fuel combustion is split into seperate reduction and oxidation processes, in which a solid carrier is reduced and ... -
Chemical Looping Reactor System Design: Double Loop Circulating Fluidized Bed (DLCFB)
(Doktoravhandlinger ved NTNU, 1503-8181; 2012:152, Doctoral thesis, 2012)Chemical looping combustion (CLC) is continuously gaining more importance among the carbon capture and storage (CCS) technologies. It is an unmixed combustion process which takes place in two steps. An effective way to ... -
CO2-expansion work recovery by impulse turbine
(Doktoravhandlinger ved NTNU, 1503-8181; 2006:7, Doctoral thesis, 2006) -
Colliding jamming fronts in a dense suspension
(Doctoral theses at NTNU;2021:366, Doctoral thesis, 2021)Mixtures of liquids and solid particles, known as suspensions, are a quite common material both in natural and industrial processes. For a high concentration of particles, some of these mixtures exhibit a quite remarkable ... -
Combined Air Conditioning and Tap Water Heating Plant, Using CO2 as Refrigerant for Indonesian Climate Condition
(Dr. ingeniøravhandling, 0809-103X; 2001:54, Doctoral thesis, 2001)A combined air-conditioning and water heating system using carbon dioxide as refrigerant has been investigated theoretically and experimentally. A computer program simulates the combined system has been developed and ... -
Combustion modeling in turbulent boundary-layer flows
(Doktor ingeniøravhandling;2003:38, Doctoral thesis, 2003)This thesis presents an investigation of turbulence modeling and chemical-kinetics effects, including local extinction, for turbulent reacting boundary-layer flows by using Favre-averaged Navier-Stokes equations. Local ... -
Combustion Modeling in Turbulent Boundary-Layer Flows
(Dr. ingeniøravhandling, 0809-103X; 2003:38, Doctoral thesis, 2003)This thesis presents an investigation of turbulence modeling and chemical-kinetics effects, including local extinction, for turbulent reacting boundary-layer flows by using Favre-averaged Navier-Stokes equations. Local ... -
Compact Interior Heat Exchangers for CO2 Mobile Heat Pumping Systems
(Dr. ingeniøravhandling, 0809-103X; 2003:69, Doctoral thesis, 2003)The natural refrigerant carbon dioxide (CO2) offers new possibilities for design of flexible, efficient and environmentally safe mobile heat pumping systems. As high-efficient car engines with less waste heat are developed, ... -
Computational fluid dynamics (CFD) modeling for biomass and wate to energy production
(Doctoral theses at NTNU;2021:177, Doctoral thesis, 2021)Solid fuel particles are usually modeled as point particles in simulations using the Eulerian-Lagrangian approach. The particles and gas phases can be resolved on vastly different scales. Since the particles are treated ... -
Computational Fluid Dynamics Modeling of Flow and Heat Transfer i Fin-Tube Bundles
(Doctoral theses at NTNU;2019:18, Doctoral thesis, 2019)Steam bottoming cycles, powered by gas turbine exhaust heat, are considered for offshore applications as a means of increasing the energy efficiency of power supply and reducing CO2 emissions from oil and gas production. ...