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008			220601s2011 sz | o |||| 0|eng d
020			_a9783031793332
024	7		_a10.1007/978-3-031-79333-2 _2doi
040			_aES-MaUEC _bspa _cES-MaUEC _dES-MaUEC
050		4	_aQC320 _b2011 EB
100	1		_aLorenzini, G. _q(Giulio) _eautor _4aut _4http://id.loc.gov/vocabulary/relators/aut _9686615
245	1	0	_aFin-Shape Thermal Optimization Using Bejan's Constuctal Theory _cby Giulio Lorenzini, Simone Moretti, Alessandra Conti
250			_a1st edition 2011
264		1	_aCham _bSpringer International Publishing _c2011
300			_a1 recurso en línea (XIII, 205 páginas)
336			_aTexto _btxt _2rdacontent
337			_aelectrónico _bc _2rdamedia
338			_arecurso electrónico _bcr _2rdacarrier
347			_aarchivo de texto _bPDF
490	0		_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 showed a 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.
988			_aSynthesis Collection of Technology_2011
650		7	_2embne _9169425 _aCalor _xTransmisión
650		7	_2embne _9139804 _aTermodinámica
700	1		_aMoretti, Simone _eautor _4aut _4http://id.loc.gov/vocabulary/relators/aut _9688310
700	1		_aConti, Alessandra _eautor _4aut _4http://id.loc.gov/vocabulary/relators/aut _9688311
776	0	8	_iPrinted edition: _z9783031793325
776	0	8	_iPrinted edition: _z9783031793349
856	4	0	_uhttps://go.openathens.net/redirector/universidadeuropea.es?url=https://doi.org/10.1007/978-3-031-79333-2 _zAcceso a este recurso digital (usuarios Universidad Europea de Madrid)
942			_2lcc _cLE
998			_b04/2023 _dz _eb _zSI