Please use this identifier to cite or link to this item:
http://hdl.handle.net/11375/8774
Full metadata record
DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | Wood, P.E. | en_US |
dc.contributor.author | Johnson, Andrew David | en_US |
dc.date.accessioned | 2014-06-18T16:43:55Z | - |
dc.date.available | 2014-06-18T16:43:55Z | - |
dc.date.created | 2011-03-08 | en_US |
dc.date.issued | 1994-06 | en_US |
dc.identifier.other | opendissertations/3950 | en_US |
dc.identifier.other | 4967 | en_US |
dc.identifier.other | 1858906 | en_US |
dc.identifier.uri | http://hdl.handle.net/11375/8774 | - |
dc.description.abstract | <p>The flow of jets in confining enclosures has significant application in many engineering processes. In particular, two jet flows have been studied; the impingement of axisymmetric jets in a confined space and a turbulent inlet wall jet in a confining enclosure.</p> <p>The impingement ofaxisynunetric jets in a cavity has been examined using<br />flow visualization, laser Doppler anemometry, and numerical simulations. When the<br />flow fIeld was examined under various geometrical and fluid parameters several flow<br />regions were found, depending on the geometrical and fluid parameters. Initially, a<br />steady flow field existed for all arrangements for Red < -90 but subsequent increments in the fluid velocity caused an oscillating flow field to emerge. The onset of the<br />oscillations and the upper limit of fmite oscillations were found to be a function of the<br />nozzle diameter to chamber dimeasion ratio. Although steady numerical simulations<br />predicted the steady flow field well. steady simulations of the oscillating flow field<br />over-predicted the peak axial velocities. The oscillating flow field is considered to be<br />a class of self-sustaining oscillations where instabilities in the jet shear layer are<br />amplified because of feed back from pressure disturbances in the impingement region.</p> <p>The turbulent wall jet in a cavity has been studied using flow visualization,<br />laser Doppler anemometry (LDA), particle streak velocimetry (PSV) and numerical<br />simulations. Instantaneous PSV measurements agreed well with time averaged LDA measurements. Two dimensional simulations using an algebraic stress turbulence<br />model (ASM) were in better agreement with the experimental data than two and three<br />dimensional simulations using a k - ɛ turbulence model in the wall jet region. A wall jet growth rate was found to be 54% higher than a wall jet in stagnant surroundings due to the enclosure boundaries.</p> | en_US |
dc.subject | Mechanical Engineering | en_US |
dc.subject | Mechanical Engineering | en_US |
dc.title | Studies of Jet Flow in Enclosures | en_US |
dc.type | thesis | en_US |
dc.contributor.department | Mechanical Engineering | en_US |
dc.description.degree | Doctor of Philosophy (PhD) | en_US |
Appears in Collections: | Open Access Dissertations and Theses |
Files in This Item:
File | Size | Format | |
---|---|---|---|
fulltext.pdf | 16.93 MB | Adobe PDF | View/Open |
Items in MacSphere are protected by copyright, with all rights reserved, unless otherwise indicated.