Numerical optimisation of square pin-fins for minimum thermal resistance with non-uniform design dimensions

dc.contributor.upauthorOlakoyejo, O.T. (Olabode Thomas)
dc.contributor.upauthorMeyer, Josua P.
dc.date.accessioned2015-04-23T09:56:34Z
dc.date.available2015-04-23T09:56:34Z
dc.date.issued2014
dc.description.abstractPaper presented to the 10th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Florida, 14-16 July 2014.en_ZA
dc.description.abstractIn this paper we apply constructal theory and design to present a three-dimensional geometric optimisation of cooling square pin-fins in forced convection of solid base material subject to constant temperature at the bottom. The main objective was to optimise the configuration in such a way that the peak temperature was minimised from the solid to the fluid of the pin fin. The cross–sectional area of solid base was fixed and the thickness of the solid is allowed to change. Three design cases are considered; the Case 1 has the pin-fins in a single row, Case 2 configuration has the pin-fins in two rows and Case 3 has configuration of the pin-fins in three rows arrangement. In all the three cases, the pin-fins geometric dimension are not uniform. The structure had four degrees of freedom as design variables: thickness of the solid base, hydraulic diameter of the pin, the height of the pin and pin spacing. The shape of the pin was not fixed but allowed to morph to determine the best configuration which gave the lowest thermal resistance. The cooling fluid (air) was driven by forced convection to the pin-fin by the stream velocity. An optimisation algorithm called Dynamic-Q was applied in order to search for the best optimal geometric configuration which improved thermal performance by minimising thermal resistance for a wide range of Reynolds number. The effect of applied Reynolds number and constant wall temperature on the optimal geometry was reported. There was unique optimal design geometry for a given Reynolds number. Results obtained show that the effects of Reynolds number on minimised thermal resistance are consistent with those obtained in the open literature.en_ZA
dc.format.mediumPDFen_ZA
dc.identifier.citationOlakoyejo, OT, Meyer, JP 2014, 'Numerical optimisation of square pin-fins for minimum thermal resistance with non-uniform design dimensions', Paper presented to the 10th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Florida, 14-16 July 2014.en_ZA
dc.identifier.isbn97817759206873
dc.identifier.urihttp://hdl.handle.net/2263/44555
dc.publisherInternational Conference on Heat Transfer, Fluid Mechanics and Thermodynamicsen_ZA
dc.rights© 2014 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria.en_ZA
dc.subjectThermal resistanceen_ZA
dc.subjectNumerical optimisationen_ZA
dc.subjectNon-uniformen_ZA
dc.titleNumerical optimisation of square pin-fins for minimum thermal resistance with non-uniform design dimensionsen_ZA
dc.typePresentationen_ZA

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