Hi all,

I am doing heat transfer through a channel. The channel is a 2D rectangle. The air flows in from the bottom, and flow out at the top.

As the air flows in, it is being heated by a solid heat source.

In my modeling, i marked out a small square (which has the same width as the rectangle) at the bottom to simulate as heat source.

However, ONLY my solid face zone shows temp variation, the remaining fluid face zone shows a constant ambient temperature.

Does anyone know why isn't my fluid being heated? Is there anything that i did wrong?

Thanks in advance to anyone who reply.

The heated zone and the unheated zones must share common faces where they meet. Make sure you merge coincident edges before exporting your mesh. This can cause the effect you describe.

Hi Evan,

My heat source is a small square measuring 0.4m x 1m at the base of my chimney which is 1m x 50m.

How can I let them share a common face? I tried to merge faces, but error message suggested that the two faces are not connected.

Pls help. Thanks.

i guess u got to merge the edge not the face cause its 2D.

if your heat source, the small square is within the chimney then u got to merge the edge.i guess they are sharing the common edge right?

if u still have problems then first draw lines in gambit, then create face using wireframe model.

hope i understood your problem right.

take care.