# Simple heat transfer problem....Desperate for help

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 February 16, 2005, 00:05 Simple heat transfer problem....Desperate for help #1 abong Guest   Posts: n/a Hi all, I am at my wits' end. I need to study heat transfer through a chimney. Up till now, I have tried all sorts of methods...but i just couldn't get my flow going. I am doing a 2D modeling. Anyone can help me by suggesting way to model the heat source? I tried specifying the bottom wall as the boundary condition, with a heat flux value. I tired inserting a radiator at the base of the chimney. Anyone have any suggestion as to how i can heat up my flow at the base of the chimney?? Millions of thanks to whoever that helps me.

 February 17, 2005, 06:41 Re: Simple heat transfer problem....Desperate for #2 JB Guest   Posts: n/a Hi, what kind of chimney? (materials, shape, etc..) what are your assumptions?

 February 17, 2005, 11:08 Re: Simple heat transfer problem....Desperate for #3 ocy Guest   Posts: n/a Hi JB, Thanks for your reply. It's a chimney made of concrete. The shape will be rectangle in 2D. The wall will be insulated. That's all. As simple as it sounds, but i can't get it work. Hope you can bring some light to me. Thanks!

 February 17, 2005, 12:08 Re: Simple heat transfer problem....Desperate for #4 JB Guest   Posts: n/a Ok, I never had to modelize free convection, but I guess that's what it is.... I think you should define at one point 2 temperatures: 1 would be the temperature of your oven, or whatever. the other one would be the outside temperature. I don't know anything about how to modelize free convection, but I'm sure you can find some data on the web Hope this will help! cheers jb

 February 17, 2005, 22:49 Re: Simple heat transfer problem....Desperate for #5 ocy Guest   Posts: n/a thanks JB, My heat source has to be specified by either a constant heat flux or heat generation rate, not by constant temp. Anyway, thanks for ur help

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