heat transfer not working well

March 1, 2005, 01:22

Hi all,

I have a vertical duct where there is air inside.

The bottom walls of the duct heat up the air as it flows in through the inlet.

When i remove the insulation of the wall, only a small region near the wall shows temp decrease. The main bulk of the air still maintains a high temp.

Is this normal? or have i done something wrong? Pls help. Thanks in advance

March 2, 2005, 11:42

Check your flow regime. If you have laminar flow, you would expect a near-wall effect only.

March 1, 2005, 01:22	heat transfer not working well	#1
ocy Guest Posts: n/a	Hi all, I have a vertical duct where there is air inside. The bottom walls of the duct heat up the air as it flows in through the inlet. When i remove the insulation of the wall, only a small region near the wall shows temp decrease. The main bulk of the air still maintains a high temp. Is this normal? or have i done something wrong? Pls help. Thanks in advance

March 2, 2005, 11:42	Re: heat transfer not working well	#2
Evan Rosenbaum Guest Posts: n/a	Check your flow regime. If you have laminar flow, you would expect a near-wall effect only.

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