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-   -   Simple heat transfer problem....Desperate for help (http://www.cfd-online.com/Forums/fluent/35746-simple-heat-transfer-problem-desperate-help.html)

abong February 16, 2005 00:05

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

JB February 17, 2005 06:41

Re: Simple heat transfer problem....Desperate for
 
Hi,

what kind of chimney? (materials, shape, etc..) what are your assumptions?

ocy February 17, 2005 11:08

Re: Simple heat transfer problem....Desperate for
 
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!

JB February 17, 2005 12:08

Re: Simple heat transfer problem....Desperate for
 
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

ocy February 17, 2005 22:49

Re: Simple heat transfer problem....Desperate for
 
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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