Temperature and Entropy Generation in Rectangular Ducts with 3-D Heat Transfer Coupling (Conduction and Convection)
- Paper number
IAC-06-C2.P.1.05
- Author
MSc Robson Leal da Silva, Instituto Tecnológico de Aeronáutica - ITA, Brazil
- Coauthor
Dr. Ezio Castejon Garcia, Instituto Tecnológico de Aeronáutica – ITA – IEM, Brazil
- Year
2006
- Abstract
The aim of this work is to elaborate a three-dimensional mathematical and computational model for analyses of the coupling of the three heat transfer modes, which are, conduction, convection and radiation without setting the temperature on contour. The coupling of equations results from the energy balancing at elements of the tube walls. These are temperature distribution dependencies. The conduction in analysis is 1-D, once the walls are considered of small thickness. For the convection problem, the formulations and methods are developed considering temperature variation in the transversal and longitudinal section (3-D) of circular or rectangular pipes, for fully developed laminar fluid flow. For the radiation problem, it is being considered the band model, which is an advance to the method that considers the treatment of heat exchange between gray bodies. One of the applications to be studied is in solar collectors for renewable energy sources, at the pipes used for fluid heating. These pipes act as extended surfaces (vanes) where there is a coupling of heat conduction and the external radiation, and between the heat conduction with internal convection that comes from the flow. The numerical method is based on finite differences applied to the algebraic equation system, which is solved by direct and interaction methods.
- Abstract document
- Manuscript document
IAC-06-C2.P.1.05.pdf (🔒 authorized access only).
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