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dc.contributor.authorLawson, Seth Augustusen_US
dc.date.accessioned2014-03-14T20:31:39Z
dc.date.available2014-03-14T20:31:39Z
dc.date.issued2007-02-08en_US
dc.identifier.otheretd-02092007-155521en_US
dc.identifier.urihttp://hdl.handle.net/10919/31190
dc.description.abstractThe heat transfer characteristics through arrays of pin fins were studied for the further development of internal cooling methods for turbine airfoils. Low aspect ratio pin fin arrays were tested through a range of Reynolds numbers between 5000 and 30,000 to determine the effects of pin spacing as well as aspect ratio on pin and endwall heat transfer. Experiments were also conducted to determine the independent effects of pin spacing and aspect ratio on arrays with different flow incidence angles. The pin Nusselt numbers showed almost no dependence on pin spacing or flow incidence angle. Using an infrared thermogaphy technique, spatially-resolved Nusselt numbers were measured along the endwalls of each array. The endwall results showed that streamwise spacing had a larger effect than spanwise spacing on array-averaged Nusselt numbers. Endwall heat transfer patterns showed that arrays with flow incidence angles experienced less wake interaction between pins than arrays with perpendicular flow, which caused a slight decrease in heat transfer in arrays with flow incidence angles. The effect of flow incidence angle on array-average Nusselt number was greater at tighter pin spacings. Even though the pin Nusselt number was independent of pin spacing, the ratio of pin-to-endwall Nusselt number was dependent on flow conditions as well as pin spacing. The pin aspect ratio had little effect on the array-average Nusselt number for arrays with perpendicular flow; however, the effect of flow incidence angle on array-average Nusselt number increased as aspect ratio decreased.en_US
dc.publisherVirginia Techen_US
dc.relation.haspartEntireThesisDraft8.pdfen_US
dc.relation.haspartEntireThesisDraft9.pdfen_US
dc.rightsI hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to Virginia Tech or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.en_US
dc.subjectpin finsen_US
dc.subjectinternal coolingen_US
dc.subjectheat transfer augmentationen_US
dc.subjectgas turbinesen_US
dc.subjectheat transferen_US
dc.titleHeat Transfer from Multiple Row Arrays of Low Aspect Ratio Pin Finsen_US
dc.typeThesisen_US
dc.contributor.departmentMechanical Engineeringen_US
dc.description.degreeMaster of Scienceen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineMechanical Engineeringen_US
dc.contributor.committeechairThole, Karen A.en_US
dc.contributor.committeememberO'Brien, Walter F. Jr.en_US
dc.contributor.committeememberVick, Brian L.en_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-02092007-155521/en_US
dc.date.sdate2007-02-09en_US
dc.date.rdate2010-10-27
dc.date.adate2007-02-22en_US


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