An Experimental study of two phase flow in inclined pipes

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dc.contributor.advisorStanislav, Jaroslav F.
dc.contributor.authorKokal, Sunil L.
dc.date.accessioned2005-07-21T21:37:08Z
dc.date.available2005-07-21T21:37:08Z
dc.date.issued1987
dc.descriptionBibliography: p. 185-199.en
dc.description.abstractA series of oil-air two phase flow experiments were conducted with a 25 m long acrylic pipe installed on an inclinable trestle at the University of Calgary flow loop. Three different pipe diameters of 25.8 mm, 51.2 mm and 76.3 mm at seven angles of 0°, ±1 °, ±5° and ±9° were studied. The fluids used were air and a light oil of 858 kg/m 3 density and 7 mPa.s viscosity at an average temperature of 23°C and pressure of 230 to 350 kPa. The data include flow pattern observations, liquid holdup, and pressure drop information over a wide range of gas and liquid flow rates. In addition, for the intermittent flow regime, bubble velocity, holdup in the liquid slug, bubble length, liquid fraction in the bubble portion, bubble/slug frequency and slug length are also reported. Such comprehensive data have not been reported previously on any two phase system. These data have been analyzed to test existing semi-theoretical models and new mechanistic models have been developed. The flow pattern transitions have been compared with the Taitel and Dukler flow pattern map. The transition from stratified to intermittent flow regime is predicted correctly by this analysis but the intermittent-annular and intermittent-dispersed bubble boundaries are not. Mechanistic models have been proposed for these transitions and the new theory predicts the transitions correctly. The pressure drop and liquid holdup were found to be flow pattern dependent. Intermittent flow was the dominant flow regime in upward flow while stratified flow dominated in downward inclined pipes. For intermittent flow the experimental results were compared with a modified Hubbard-Dukler analysis. Almost all parameters in this model were calculated from first principles and an interfacial shear term was added for the gas film. This model yields excellent results even for the transition region between the intermittent and truly annular flow designated as "proto" slug flow. A separated model has been proposed for stratified flow and homogeneous models for dispersed bubble and annular flow for predicting pressure drop and liquid holdup in inclined pipes. The results show good agreement with the experimental data.en
dc.format.extentxxiii, 295 leaves : ill. ; 30 cm.en
dc.identifier.citationKokal, S. L. (1987). An Experimental study of two phase flow in inclined pipes (Doctoral thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca. doi:10.11575/PRISM/14066en_US
dc.identifier.doihttp://dx.doi.org/10.11575/PRISM/14066
dc.identifier.isbn0315380179en
dc.identifier.lccTA 357 K64 1988en
dc.identifier.urihttp://hdl.handle.net/1880/23721
dc.language.isoeng
dc.publisher.institutionUniversity of Calgaryen
dc.publisher.placeCalgaryen
dc.rightsUniversity of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.
dc.subject.lccTA 357 K64 1988en
dc.subject.lcshPipe - Fluid dynamics
dc.subject.lcshTwo-phase flow
dc.titleAn Experimental study of two phase flow in inclined pipes
dc.typedoctoral thesis
thesis.degree.disciplineChemical and Petroleum Engineering
thesis.degree.grantorUniversity of Calgary
thesis.degree.nameDoctor of Philosophy (PhD)
ucalgary.item.requestcopytrue
ucalgary.thesis.accessionTheses Collection 58.002:Box 623 520535266
ucalgary.thesis.notesoffsiteen
ucalgary.thesis.uarcreleaseyen
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