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-   -   Heating/Drying in a closed area (http://www.cfd-online.com/Forums/cfx/118957-heating-drying-closed-area.html)

Szczepan June 7, 2013 04:33

Heating/Drying in a closed area
 
Hello,

I would like to simulate a temperature distribution on the steel-articles which are dried in a drying cabine.
In this cabine there is an heat exchanger and air circulates in a closed area. See the attached file.
I would like to do an transient simulation and check, which ist the temperatur of this articles after x seconds.
Because air circulate in a closed area I don't know, where I should give bonudary conditions... (for example outlet don't mean in this case that the air go outside but this air is still in our simulation area).

http://s3.postimg.org/4101rql0v/heating.jpg

Thank you.

Szczepan June 9, 2013 07:13

Hello,

- I made in my simulation a simplification: I skip the modeling of fan and heat exchanger and I defined only the inlet and outlet temperature from a heat exchanger documentation (inlet to heat exchanger 25 C, outlet 90 C). See the first attached file.

http://s3.postimg.org/v50oivvgf/image.jpg

- I would like to do a transient analyse to check drying of steel articles. My CFD Model - see the second attached file (orange colour is air, grey colour are steel articles).

http://s24.postimg.org/uidceeva9/model.jpg

- I defined a domain interface between air and steel articles
- I have a question about the results of a temperature distribution: On all 3 steel parts we have a quite the same temperature (+- 0.1 C). See the third attached file. It is rather not possible,

http://s21.postimg.org/gfpzq2gnn/results.jpg

My BC about heat transfer:
Specific heat capacity [1/(J*K)] for steel is defined.
Heat transfer by air-domain and steel-domain is: Thermal Energy
Heat transfer by domain-interfaces (steel vs air) are Conservative Interface Flux
Which parameter more can miss here?

Thank You
Michal Szczepaniak

ghorrocks June 10, 2013 22:40

Quote:

On all 3 steel parts we have a quite the same temperature (+- 0.1 C). See the third attached file. It is rather not possible,
Why not? The duct you drew would result in fairly even air flow in each heating station so you would then expect the result at each station to be quite similar. If they are not similar then there is an additional effect you have not included which is causing it.


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