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dc.rights.licenseRestricted to current Rensselaer faculty, staff and students. Access inquiries may be directed to the Rensselaer Libraries.
dc.contributorJensen, M. K.
dc.contributorJansen, Kenneth E.
dc.contributorHirsa, Amir H.
dc.contributorSchwendeman, Donald W.
dc.contributor.authorKim, Je-Hoon.
dc.date.accessioned2021-11-03T08:55:26Z
dc.date.available2021-11-03T08:55:26Z
dc.date.created2017-12-15T11:55:12Z
dc.date.issued2000-12
dc.identifier.urihttps://hdl.handle.net/20.500.13015/2101
dc.descriptionDecember 2000
dc.descriptionSchool of Engineering
dc.description.abstractFrom both local and global analysis of the flow field and heat transfer, it was indicated that significant variations (as much as 20%) in both friction factors and Nusselt numbers can occur depending on small changes in fin profile in microfin tubes. A complete set of local flow visualization results and analysis for four different fin shapes are presented to help explain governing flow mechanisms which cause this phenomenon.
dc.description.abstractNumerical results show that under fully developed flow conditions without flow separation in the streamwise direction, only two layers of elements in the streamwise direction are needed to resolve the entire flow field, thus leading to significant computational savings. Efficient heat transfer simulations are also realized by reusing and periodically copying the converged flow field information without simulating the entire geometry. Issues encountered in the simulation of complex geometries such as turbulent time scales, laminarization, non-trivial initial conditions for ??-ε models, and performance comparison of four popular RANS turbulence models (Spalart-Allmaras model, ??-ε model ofLam-Bremhorst, SST model of Menter, and ??-ε model of Goldberg) are discussed.
dc.description.abstractA stabilized finite element solver is used to solve turbulent flows and heat transfer in complex, three-dimensional spirally finned tubes. One- and two-equation turbulence models are implemented and evaluated for their performance. Details of the stabilized finite element formulations for incompressible flow are presented, and cost effective model simplifications and solution procedures are introduced.
dc.language.isoENG
dc.publisherRensselaer Polytechnic Institute, Troy, NY
dc.relation.ispartofRensselaer Theses and Dissertations Online Collection
dc.subjectMechanical engineering
dc.titleFin shape effects in turbulent heat transfer in tubes with helical fins
dc.typeElectronic thesis
dc.typeThesis
dc.digitool.pid178715
dc.digitool.pid178717
dc.digitool.pid178719
dc.rights.holderThis electronic version is a licensed copy owned by Rensselaer Polytechnic Institute, Troy, NY. Copyright of original work retained by author.
dc.description.degreePhD
dc.relation.departmentDept. of Mechanical Engineering


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