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Memorial University - Electronic Theses and Dissertations 3
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Document Description
TitleQuantitative flow visualization system for gas-liquid two phase flows
AuthorHiscock, John E., 1974-
DescriptionThesis (M.Eng.)--Memorial University of Newfoundland, 2000. Engineering and Applied Science
Paginationxiv, 151 leaves : ill.
SubjectFlow visualization; Two-phase flow
Degree GrantorMemorial University of Newfoundland. Faculty of Engineering and Applied Science
DisciplineEngineering and Applied Science
NotesBibliography: leaves 120-124
AbstractThe main objective of this research was to develop a quantitative flow visualization technique to measure gas bubble size and velocities of vertical-up gas-liquid flows. A system to acquire high-speed digital images was designed and integrated with a hot-film anemometry system in the test section of the 76 mm flow loop at Memorial University of Newfoundland. Digital image processing algorithms were developed to obtain the gas bubble size and velocity information from the high-speed flow images. The gas slug and bubble velocities were estimated using two separate image processing algorithms: a supervised motion tracking algorithm and an edge detection cross-correlation algorithm. The supervised motion tracking algorithm allows the user to identify and track the movement of distinguishable gas bubbles and slugs. The edge detection cross-correlation algorithm uses standard edge detection routines to identify the boundaries of the slugs and bubbles. The bubble size information is obtained through morphological operations on the edge-detected images. The displacement of the bubbles between two frames is obtained through a cross-correlation analysis between the frames. Measurements were performed in the slug flow regime at several gas and liquid superficial velocities. Results obtained from the quantitative noninvasive flow visualization and image analysis techniques are in good agreement with results from simultaneous hot film anemometry measurements.
Resource TypeElectronic thesis or dissertation
FormatImage/jpeg; Application/pdf
SourcePaper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries
Local Identifiera1493371
RightsThe author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission.
CollectionElectronic Theses and Dissertations
Scanning StatusCompleted
PDF File(15.86 MB) --
CONTENTdm file name202909.cpd