000 05599nam a22005415i 4500
001 978-3-031-79333-2
003 DE-He213
005 20240730164300.0
007 cr nn 008mamaa
008 220601s2011 sz | s |||| 0|eng d
020 _a9783031793332
_9978-3-031-79333-2
024 7 _a10.1007/978-3-031-79333-2
_2doi
050 4 _aTA174
072 7 _aTBD
_2bicssc
072 7 _aTEC016000
_2bisacsh
072 7 _aTBD
_2thema
082 0 4 _a620.0042
_223
100 1 _aLorenzini, Giulio.
_eauthor.
_4aut
_4http://id.loc.gov/vocabulary/relators/aut
_983509
245 1 0 _aFin-Shape Thermal Optimization Using Bejan's Constuctal Theory
_h[electronic resource] /
_cby Giulio Lorenzini, Simone Moretti, Alessandra Conti.
250 _a1st ed. 2011.
264 1 _aCham :
_bSpringer International Publishing :
_bImprint: Springer,
_c2011.
300 _aXIII, 205 p.
_bonline resource.
336 _atext
_btxt
_2rdacontent
337 _acomputer
_bc
_2rdamedia
338 _aonline resource
_bcr
_2rdacarrier
347 _atext file
_bPDF
_2rda
490 1 _aSynthesis Lectures on Engineering,
_x1939-523X
505 0 _aGeneral Introduction -- General Overview on Heat Transfer -- Conservation Equations -- Dimensionless group -- Units and conversion factors -- Overview of heat transfer on extended surfaces -- State of the art in the T-Shaped Fins -- Thermal exchange basis -- T-Shaped fins -- Y-Shaped fins -- Modular systems of Y-Shaped fins -- Heat removal vs Pressure drops -- Conclusions.
520 _aThe book contains research results obtained by applying Bejan's Constructal Theory to the study and therefore the optimization of fins, focusing on T-shaped and Y-shaped ones. Heat transfer from finned surfaces is an example of combined heat transfer natural or forced convection on the external parts of the fin, and conducting along the fin. Fin's heat exchange is rather complex, because of variation of both temperature along the fin and convective heat transfer coefficient. Furthermore possible presence of more fins invested by the same fluid flow has to be considered. Classical fin theory tried to reduce the coupled heat transfer problem to a one-dimensional problem by defining an average temperature of the fin and writing equations using this parameter. However, it was shown that this approach cannot be used because of the effects of two-dimensional heat transfer, especially in the presence of short fins. CFD codes offer the possibility to consider bi-dimensional (and more generally, three-dimensional) effects and then a more real approach to the physic phenomena of finned surface's heat exchange. A commercial CFD code was used to analyse the case of heat exchange in presence of T-shaped fins, following an approach suggested by Bejan's Constructal Theory. The comparative results showed a significant agreement with previous research taken as a reference, and this result allows for the application of this approach to a wider range of systems. T-shaped optimized fin geometry is the starting point for further research. Starting from the optimal results (T-shape optimized fins), we show the trend of the assessment parameter (the dimensionless conductance) in function of the angle a between the two horizontal arms of the fin. A value for a, 90° < a < 180° capable of a higher value of the dimensionless conductance, has not been found. The thermal efficiency showeda significant increase of this parameter, especially for values of a smaller than 100°. Thus, a new definition of optimisation is achieved by introducing the fundamental ""space factor."" The present work unifies the ""classic"" definitions of optimisation and efficiency in a new general performance criterion, opening a new perspective on multi-fin systems. The last chapter deals with a brief overview on Bejan's Constructal Theory. It explains either tree-shape natural flows or other geometric form in nature and engineering, applying the principle of performance maximization. The Constructal principle also recognizes that a new good form comes to another previous good form which serve the same objective and have the same constraints. Changes in configuration are dynamic, thus a time arrow is then associated to the evolution in system's configuration. Table of Contents: General Introduction / General Overview on Heat Transfer / Conservation Equations / Dimensionless group / Units and conversion factors / Overview of heat transfer on extended surfaces / State of the art in the T-Shaped Fins / Thermal exchange basis / T-Shaped fins / Y-Shaped fins / Modular systems of Y-Shaped fins / Heat removal vs Pressure drops / Conclusions.
650 0 _aEngineering design.
_93802
650 0 _aMaterials.
_97549
650 0 _aProfessional education.
_941513
650 0 _aVocational education.
_941514
650 1 4 _aEngineering Design.
_93802
650 2 4 _aMaterials Engineering.
_932311
650 2 4 _aProfessional and Vocational Education.
_941516
700 1 _aMoretti, Simone.
_eauthor.
_4aut
_4http://id.loc.gov/vocabulary/relators/aut
_983511
700 1 _aConti, Alessandra.
_eauthor.
_4aut
_4http://id.loc.gov/vocabulary/relators/aut
_983513
710 2 _aSpringerLink (Online service)
_983515
773 0 _tSpringer Nature eBook
776 0 8 _iPrinted edition:
_z9783031793325
776 0 8 _iPrinted edition:
_z9783031793349
830 0 _aSynthesis Lectures on Engineering,
_x1939-523X
_983517
856 4 0 _uhttps://doi.org/10.1007/978-3-031-79333-2
912 _aZDB-2-SXSC
942 _cEBK
999 _c85522
_d85522