Local heat transfer in an enclosed corotating disk with axial throughflow

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dc.contributor.advisorHan, Je Chin
dc.contributor.committeeMemberAhmed, A.
dc.contributor.committeeMemberAnand, N. K.
dc.contributor.committeeMemberKhim, K. D.
dc.creatorKim, Soo Yong
dc.date.accessioned2024-02-09T21:09:18Z
dc.date.available2024-02-09T21:09:18Z
dc.date.issued1992
dc.descriptionVitaen
dc.descriptionMajor subject: Mechanical Engineeringen
dc.description.abstractLocal heat transfer in an enclosed corotating disk with axial throughflow was investigated. The rotating cavity has two plane disks and a cylindrical rim (shroud). The ratio of the rim span to the disk outer radius is 0.4 and the ratio of the disk inner radius to outer radius is 0.25. The objectives of this study are to investigate the effects of axial coolant flow rate, rotational speed, and disk surface temperature on the local heat transfer coefficient distributions inside the disk cavity. Six disk surface heating conditions (BC1, BC2, BC3, BC4, BC5 and BC6) were tested for the axial flow Reynolds numbers between 2500 and 25,000, the rotational Reynolds numbers between 0 and 5.11x10^5 and the rotational Grashof numbers between 1.8x10^6 and 2.2x10^10, respectively. The results showed that the disk cavity local heat transfer coefficients for the non-rotating cavity increase with increasing axial flow Reynolds number. However, the cavity local heat transfer coefficients decrease with increasing rotational Reynolds number and then increase with further increasing rotational Reynolds number. The downstream disk and rim generally have higher Nusselt numbers than the upstream disk. The Nusselt numbers on the upstream disk for BC 4, BC 5 and BC 6 are respectively lower than BC 1 and the Nusselt numbers on the downstream disk for BC 3, BC 5 and BC 6 are respectively lower than BC 1. However, the uneven disk temperature effect on the local Nusselt numbers decrease with decreasing axial Reynolds number and decrease with low rotational Reynolds number (Re[x] = 0 - 3.19x10^5), however, increase with high rotational Reynolds number (Re[x] = 5.11x10^5). The disk cavity Nusselt numbers for BC 1 and BC 2 are comparable. In general, the modified Nusselt numbers (NU[y]) on the upstream and downstream disks of this study and Farthing et al. (1990b) are lower than the flat verical wall natural convection correlations. The Nusselt numbers for Re[z] = 25,000 agree well with that of Farthing et al. (Re[z] = 2x10^4) except the present data are higher and lower, respectively, near the disk entrance (Gry = 1010) and near the rim (Gr[y] = 10^7). The averaged Nusselt numbers on the rim increase with increasing rotational Grashof numbers. However, the present rim data are lower than the natural convection correlation from the face down heated plate.en
dc.format.digitalOriginreformatted digitalen
dc.format.extentxviii, 232 leavesen
dc.format.mediumelectronicen
dc.format.mimetypeapplication/pdf
dc.identifier.oclc31191605
dc.identifier.urihttps://hdl.handle.net/1969.1/DISSERTATIONS-1397370
dc.language.isoeng
dc.publisher.digitalTexas A&M University. Libraries
dc.rightsThis thesis was part of a retrospective digitization project authorized by the Texas A&M University Libraries. Copyright remains vested with the author(s). It is the user's responsibility to secure permission from the copyright holder(s) for re-use of the work beyond the provision of Fair Use.en
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subjectMajor mechanical engineeringen
dc.subject.classification1992 Dissertation K497
dc.subject.lcshTurbomachinesen
dc.subject.lcshCoolingen
dc.subject.lcshHeaten
dc.subject.lcshTransmissionen
dc.subject.lcshDisks, Rotatingen
dc.subject.lcshThermal propertiesen
dc.titleLocal heat transfer in an enclosed corotating disk with axial throughflowen
dc.typeThesisen
dc.type.genredissertationsen
dc.type.materialtexten
thesis.degree.disciplineMechanical Engineeringen
thesis.degree.grantorTexas A&M Universityen
thesis.degree.levelDoctorialen
thesis.degree.nameDoctor of Philosophyen
thesis.degree.namePh. Den

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