Change search
ReferencesLink to record
Permanent link

Direct link
CFD study of a rotating gas-liquid separator: Design og bygging av flere mikro-dråpe generatorer
Norwegian University of Science and Technology, Faculty of Engineering Science and Technology, Department of Energy and Process Engineering.
2013 (English)MasteroppgaveStudent thesis
Abstract [en]

Extracting Natural Gas from the reservoirs and transporting it to shore requires the gas to be pure from liquids and contaminants. These contaminants can be extracted from the gas by separators. A new separation technology, the Lynx separator, has been developed at NTNU, where a rotating element inside the separator is to capture liquid particles and introduce a centrifugal force for increasing the separation efficiency. The knowledge on how this element influences the flow and performs is limited, and there are no known experiments performed on this system per today. Using CFD tools to construct a suitable model can contribute to increase the knowledge on how this capturing element impacts the flow. The work presented in this thesis has been looking into the structure of metal foams used as the separation mechanism in Lynx separator. A model of a single cell representing a microstructure of the real life foam geometry has been constructed in ANSYS Mechanical APDL and further included in ANSYS FLUENT, where three cells were united as one element with a capturing cylinder around to represent a simple small scale model of the separator. By turbulent k-omega modeling in combination with the Discrete Phase Model, simulations on gas-liquid flow represented by air with inert water particles of different diameters has been calculated upon, where the focus has been set on the interaction between the particles and the metal foam cells. Different cases have been investigated where the capturing element has been set into different angular velocities to quantify the impact on the gas flow and particle behavior. The presented model shows the influence of the different rotating velocities on both gas and particle flow. The capture of particles with a stationary metal foam is mainly limited to larger particles with a diameter of 100 µm and 500 µm. Introducing a centrifugal force results in swirling flow for both gas and larger particles, reducing the interaction of larger particles with the metal foam cells as these particles swirl out towards the walls. The flow of 10 µm particles result in a radial displacement as a result of colliding with the metal foam, separating them from the gas, while capture of 1 µm has showed to be very limited. Introducing a very high rotational velocity has shown to reduce the reliability of the proposed model, and it cannot be verified that this model is reliable as the rotational velocity exceeds 2000 rotations per minute.

Place, publisher, year, edition, pages
Institutt for energi- og prosessteknikk , 2013. , 98 p.
URN: urn:nbn:no:ntnu:diva-22661Local ID: ntnudaim:10160OAI: diva2:651211
Available from: 2013-09-24 Created: 2013-09-24 Last updated: 2013-09-24Bibliographically approved

Open Access in DiVA

fulltext(13729 kB)2517 downloads
File information
File name FULLTEXT01.pdfFile size 13729 kBChecksum SHA-512
Type fulltextMimetype application/pdf
cover(184 kB)11 downloads
File information
File name COVER01.pdfFile size 184 kBChecksum SHA-512
Type coverMimetype application/pdf

By organisation
Department of Energy and Process Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 2517 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 77 hits
ReferencesLink to record
Permanent link

Direct link