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.

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

Hi,

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

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!

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

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