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 May 9, 2009, 06:22 #2 New Member   Join Date: May 2009 Posts: 9 Rep Power: 10 Ok, i have tested the sst transitional k-w model in fluent. 3D model, 1.2m cells with horizontal central distance of 750mm yields 171W/m2 while 2d soulution gives 141 W/m2, thats 82% (1.6m vertical parallel plates 333.15K isothermal). Pretty close, now i have to test the influence of the turbulent intensity and hydraulic diameter on the vertical open boundary between radiators. Testing laminar model in 2d gives 141 W/m2 while 3d model (same settings as 3d sst transitional k-w) gives 140 W/m2. Let's continue testing...

 May 9, 2009, 14:41 #3 Senior Member   Ahmed Join Date: Mar 2009 Location: NY Posts: 251 Rep Power: 11 It depends on what exactly are the objectives of your analysis. If you really want to understand what is taking place there, and be able to answer all kinds of questions that might come to your mind, I would put CFD aside and start developing a mathematical model for that heat exchanger. The procedure is straight forward though it will lead to a coupled set of partial differential equations, in the simplest case it will lead to an ugly mathematical expression obtained by a Laplace Transformation technique but it can answer any raised questions. Check the literature on Heat Exchangers Performance and the works by Vedat Arpaci Cheers and enjoy your math journey.

 May 9, 2009, 15:31 #4 New Member   Join Date: May 2009 Posts: 9 Rep Power: 10 I only need heat transfer coefficient and emission dependence of oil flow speed on heat transfer, but i have not found any literature on this topic yet. Using parallel plates heat transfer coefficient clearly does not work, as the flow is turbulent on the edges. The air speed is around 0.9m/s in 2d geometry, so i fall in transitional or turbulent range (plates are 0.035m apart)...

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