# Modelling heat flux through pipe wall

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 July 31, 2019, 12:17 Modelling heat flux through pipe wall #1 New Member   Ziad El Koussa Join Date: Jul 2019 Posts: 2 Rep Power: 0 I have a simple case to model however I am constantly getting errors. Given a copper pipe with interior diameter 4.75mm and outer diameter 6mm, water flowing at velocity 0.3m/s through the pipe at 293K. The pipe has a constant heat flux of 166W/m^ 2. I tried running an extruded circle (cylinder) with 4.75mm diameter and then applied a heat flux of 166 with a wall thickness of 1.25mm. I also tried running a pipe (two circles at 4.75mm and 6mm which were then extruded). Also, a cylinder with the BC at the wall to have shell conduction set to 1 layer at 1.25mm. For the cylinder cases, I applied an inflated mesh. However, for all these results, I would not get the expected temperature profile.

 August 1, 2019, 00:22 #2 Senior Member   Alexander Join Date: Apr 2013 Posts: 2,363 Rep Power: 34 may be the problem is your expectations best regards

 August 1, 2019, 10:57 #3 New Member   Join Date: Jul 2019 Posts: 3 Rep Power: 7 Did you define the volume surrounding the pipe? Heat flux is dependent on the delta T. Q = h A dT

August 2, 2019, 14:26
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Ziad El Koussa
Join Date: Jul 2019
Posts: 2
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no i did not

i just modelled the pipe itself.

i varied the conditions a bit making them the same as those found in literature.
I applied a heat flux of 10^6 W/m.m and an inlet temperature = 273K at 3m/s
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 August 2, 2019, 15:34 #5 New Member   Join Date: Jul 2019 Posts: 3 Rep Power: 7 If you do not define a fluid with a given temperature outside the pipe it can only transfer energy through radiation. The fluid (assuming air in this case) is required for conduction simulations.

 August 14, 2019, 13:54 #6 Member   MIDHUN Join Date: Nov 2012 Location: calicut Posts: 46 Rep Power: 13 please give inflation and set wall y plus less than 5 or close to 1 if possible and retry

 Tags conjugate heat transfer, heat flux, pipe flow, temperature profile

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