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Conjugate, non-isothermal u-pipe, time-dependent study

Posted 1 mai 2012, 17:04 UTC−4 Fluid & Heat, Heat Transfer & Phase Change Version 4.2a 2 Replies

He Qi
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I wanted to simulate the heat transfer of fluid in a u-pipe. However, I'm really confused about which module and model should I use?

Initially what I wanted to do is to choose the heat transfer in porous media modulue, however, I found difficulties of solving the problem of directing the fluid from vertical pipe into u-shaped corner by defining a velocity. Based on my shallow experience with Comsol so far, it seems that this modulus only allows the fixed velocity vector to be defined at the input stage, and I found it difficult to resolve for the model.

I have also tried to use the conjugate heat transfer as well as non-isothermal flow... then I started to get more confused because my analysis has to be carried in time-depenent study. Would anyone give me some advices?

Thanks for your advice in advance!

2 Replies Last Post 14 mai 2012, 07:31 UTC−4
Steven Chiuta
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Posted: 1 decade ago 14 mai 2012, 05:56 UTC−4
I am alos new to Comsol but i would suggest that you start simple. Just forget about using the conjugate heat transfer application mode and try to do it stepwise using simpler physics that when coupled approximate conjugate heat transfer. For example, you could start by solving the fluid flow alone then couple this to heat transfer or reaction and see what you get.
I am alos new to Comsol but i would suggest that you start simple. Just forget about using the conjugate heat transfer application mode and try to do it stepwise using simpler physics that when coupled approximate conjugate heat transfer. For example, you could start by solving the fluid flow alone then couple this to heat transfer or reaction and see what you get.
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 14 mai 2012, 07:31 UTC−4
Hi
Indeed I would say that is a wise advice, but do not foret that, depening on your model, you do not always who is "master" and who is "slave" between flow and heat. So ending up with a fully coupled and pre-cooked Conjugated Heat Flow model is good practice too

--
Good luck
Ivar
Hi Indeed I would say that is a wise advice, but do not foret that, depening on your model, you do not always who is "master" and who is "slave" between flow and heat. So ending up with a fully coupled and pre-cooked Conjugated Heat Flow model is good practice too -- Good luck Ivar

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