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Laboratory experiments of multi-phase plumes in stratification and crossflow

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dc.contributor.advisor E. Eric Adams. en_US Socolofsky, Scott A. (Scott Alan) en_US
dc.contributor.other Massachusetts Institute of Technology. Dept. of Civil and Environmental Engineering. en_US 2012-11-19T19:15:19Z 2012-11-19T19:15:19Z 2001 en_US 2001 en_US
dc.description Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2001. en_US
dc.description Includes bibliographical references (p. 227-233). en_US
dc.description.abstract ocean, with applications ranging from carbon sequestration to the fate of oil and gas released from an oil well blowout. Experimental techniques included LASER induced fluorescence, shadowgraph visualization, salinity and dye concentration profiling, stratification generated by the two-tank method (using a 1.2 m square by 2.4 m deep, glass-walled tank), and crossflow generated by a towed source (using a 28 m long flume with 0.8 m square cross-section). Size spectra of droplets and bubbles were measured using a phase Doppler particle analyzer. To control particle size, sediment was also used; sediment size was measured using a micrometer. Slip velocities among all buoyancy sources ranged from 3 to 35 cm/s. Stratified experiments investigated the dependence of plume properties on the nondimensional slip velocity, UN= us/(BN)1/4 , where u, is the slip velocity, B is the total kinematic buoyancy flux, and N is the Brunt-Vaissld buoyancy frequency. First, UN predicts the transitions among characteristic plume types, and a new plume type was identified where the bubbles are dispersed by the intruding fluid. Second, non-dimensional variables (including characteristic length scales, volume and buoyancy fluxes, and fraction peeled) correlate with UN and were chosen to provide insight and calibration data to models. Crossflow experiments demonstrated fractionation (sorting of bubbles based on slip velocity) and separation (entrained fluid completely separating from the dispersed phase). Plumes were observed to have a fully-developed plume stage followed by separation at a critical height, hs, dependent on B, us, and the crossflow velocity, u[infinity]. A single-phase model was applied to these plumes by treating the separated fluid as a buoyant momentum jet. Stratified crossflow experiments showed that separation occurs at the lower of hs or the peel height in stagnant stratification (which correlates with UN). en_US
dc.description.statementofresponsibility by Scott A. Socolofsky. en_US
dc.format.extent 233 p. en_US
dc.language.iso eng en_US
dc.publisher Massachusetts Institute of Technology en_US
dc.rights M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. en_US
dc.rights.uri en_US
dc.subject Civil and Environmental Engineering. en_US
dc.title Laboratory experiments of multi-phase plumes in stratification and crossflow en_US
dc.type Thesis en_US Ph.D. en_US
dc.contributor.department Massachusetts Institute of Technology. Dept. of Civil and Environmental Engineering. en_US
dc.identifier.oclc 48067359 en_US

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