Book description
The book contains research results obtained by applying Bejan's Constructal Theory to the study and therefore the optimization of fins, focusing on Tshaped and Yshaped 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 onedimensional 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 twodimensional heat transfer, especially in the presence of short fins. CFD codes offer the possibility to consider bidimensional (and more generally, threedimensional) 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 Tshaped 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. Tshaped optimized fin geometry is the starting point for further research.
Starting from the optimal results (Tshape optimized fins), we show the trend of the assessment parameter (the dimensionless conductance) in function of the angle α between the two horizontal arms of the fin. A value for α, 90° < α < 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 α 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 multifin systems.
The last chapter deals with a brief overview on Bejan's Constructal Theory. It explains either treeshape 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 TShaped Fins / Thermal exchange basis / TShaped fins / YShaped fins / Modular systems of YShaped fins / Heat removal vs Pressure drops / Conclusions
Table of contents
 Preface
 Introduction
 Methods of analysis
 Models

Constructal Theory
 Constructal Law: A New Sight on Engineering and Nature
 The Concepts of Objective, Constraints and ``Better''
 The VolumeToPoint Flow Problem
 Elemental Volume
 First Construct
 Second and Higher Order Constructs
 Three Dimensional Trees in Fluid flows
 Rivers and Ducts
 Turbulence
 Dendritic Crystals
 TreeShaped Living Systems
 Fluid Layers Heated from Below: The Case of Benard Convection
 Optimized Flow Paths in Fluid Layers Heated from Below
 ParallelPlate Channels (1/2)
 ParallelPlate Channels (2/2)
 Flow Spacing in Forced and Natural Convection
 Multiobjective Architectures
 Duct with Wrinkled Entrances
 Thermodynamics of Flow Structures
 Bibliography for the Appendix
 Bibliography
 Authors' Biographies
Product information
 Title: FinShape Thermal Optimization Using Bejan's Constuctal Theory
 Author(s):
 Release date: January 2011
 Publisher(s): Morgan & Claypool Publishers
 ISBN: 9781608456086
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