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By Amimul Ahsan

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06 10 0. 0 8 0. 0 08 0. 04 Fig. 18. 06 26 Convection and Conduction Heat Transfer It is worth observing that, the fluid heated in the first heater reaches the second one, and then the third one. Thus, this process of increasing temperature provides undesirable situations when cooling is aimed. Re = 10, γ = 0° Re = 100, γ = 0° Re = 10, γ = 45° Re = 100, γ = 45° Re = 10, γ = 90° Re = 100, γ = 90° Fig. 19. Velocity vectors for Gr = 105, Re = 10 and 100, and γ = 0°, 45°and 90° Figure (19) depicts the velocity vectors for Re = 10 and 100 and Gr = 105 for γ = 0°, 45°, and 90°.

31, pp. 217-234. M. (2007). Phd. Thesis: Heat transfer analysis of mixed convection using the Petrov-Galerkin technique and the penalty, Brazil. Guimarães, P. M. (2008). Combined free and forced coonvection in an inclined channel with discrete heat sources, Int. Communications of Heat and Mass Transfer, Vol. 35, pp. 1267-1274. 0 2 Periodically Forced Natural Convection Through the Roof of an Attic-Shaped Building Suvash Chandra Saha School of Engineering and Physical Sciences, James Cook University Australia 1.

Therefore, the channel inclination angles 45° and 90° were the best ones with little difference between them. An exception was the case with Gr = 105 and Re = 1000, where γ = 0° was the ideal inclination. The authors found an interesting behaviour in all three cases with one, two or three heat sources: There is a moment in all three cases studied when oscillations in time near the heat sources appear, featuring their initial strength and then reaching its maximum and, eventually, ending up going weaker until the flow does not present these time oscillations anymore.

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