Heat Transfer from Low Aspect Ratio Pin Fins

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dc.contributor.authorLyall, Michael Ericen
dc.contributor.committeechairThole, Karen A.en
dc.contributor.committeememberDiller, Thomas E.en
dc.contributor.committeememberVick, Brian L.en
dc.contributor.departmentMechanical Engineeringen
dc.date.accessioned2014-03-14T20:39:34Zen
dc.date.adate2006-06-19en
dc.date.available2014-03-14T20:39:34Zen
dc.date.issued2006-06-02en
dc.date.rdate2006-06-19en
dc.date.sdate2006-06-07en
dc.description.abstractThe performance of many engineering devices from power electronics to gas turbines is limited by thermal management. Pin fins are commonly used to augment heat transfer by increasing surface area and increasing turbulence. The present research is focused on but not limited to internal cooling of turbine airfoils using pin fins. Although the pin fins are not limited to a single shape, circular cross-sections are most common. The present study examines heat transfer from a single row of circular pin fins with the row oriented perpendicular to the flow. The configurations studied have spanwise spacing to pin diameter ratios of two, four, and eight. Low aspect ratio pin fins were studied whereby the channel height to pin diameter was unity. The experiments are carried out for a Reynolds number range of 5000 to 30,000. Heat transfer measurements are taken on both the pin and on the endwall covering several pin diameters upstream and downstream of the pin row. The results show that the heat transfer augmentation relative to open channel flow is highest for the smallest spanwise spacing for the lowest Reynolds number flows. The results also indicate that the pin fin heat transfer is higher than on the endwall.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-06072006-150605en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-06072006-150605/en
dc.identifier.urihttp://hdl.handle.net/10919/33470en
dc.publisherVirginia Techen
dc.relation.haspartLyall_Thesis.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectpin finsen
dc.subjectHeat--Transmissionen
dc.subjectgas turbinesen
dc.subjectinternal coolingen
dc.subjectHeat--Transmission augmentationen
dc.titleHeat Transfer from Low Aspect Ratio Pin Finsen
dc.typeThesisen
thesis.degree.disciplineMechanical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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