CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   FLOW-3D (http://www.cfd-online.com/Forums/flow-3d/)
-   -   heat transfer to porous media... (http://www.cfd-online.com/Forums/flow-3d/81340-heat-transfer-porous-media.html)

club68512 October 24, 2010 11:30

heat transfer to porous media...
 
hello~everyone

I have a problem about ...heat transfer to porous media.
the model is porous media with water ...
the initial condition is 300K (include water and porous media and the porous media is copper)
when the water is heating 400K and the porous is only 320k...

I don't know why the porous medis's temperature is so low...

MuxaB October 29, 2010 00:21

Quote:

Originally Posted by club68512 (Post 280521)
hello~everyone

I have a problem about ...heat transfer to porous media.
the model is porous media with water ...
the initial condition is 300K (include water and porous media and the porous media is copper)
when the water is heating 400K and the porous is only 320k...

I don't know why the porous medis's temperature is so low...

Where does the heat come from? Is hot fluid coming from a mesh boundary or is there viscous heating or another heat source?

club68512 October 31, 2010 22:49

thanks !

from the flow3D's user guide,I found....
OSPOR(m)
0.0
Surface area per unit bulk volume for porous component m (used for heat transfer only).
but I am not clearly about how to use...

the "Surface area per unit bulk volume for porous component m" ... does it means the holes? or the component?

MuxaB November 1, 2010 00:46

Quote:

Originally Posted by club68512 (Post 281590)
thanks !

from the flow3D's user guide,I found....
OSPOR(m)
0.0
Surface area per unit bulk volume for porous component m (used for heat transfer only).
but I am not clearly about how to use...

the "Surface area per unit bulk volume for porous component m" ... does it means the holes? or the component?

It means the total surface area inside all the pores in a unit bulk volume of the component. It is a function of the internal structure of the porous media and can be different for the same volumetric porosity. For examples, extruded filters or sponge or foam filters all have different surface area, even though their porosities may be the same.

club68512 November 2, 2010 10:23

thank you!
so... if i want the porous media have the heat transfer effect,the ospor can't use the default value 0 ?
you said that means the "total surface area inside all the pores in a unit bulk volume of the component",do you mean the all the porous media's surface area?

MuxaB November 4, 2010 00:20

Quote:

Originally Posted by club68512 (Post 281831)
thank you!
so... if i want the porous media have the heat transfer effect,the ospor can't use the default value 0 ?
you said that means the "total surface area inside all the pores in a unit bulk volume of the component",do you mean the all the porous media's surface area?

that's correct, ospor must be positive for heat transfer to take place. and yes, it includes all the porous media surface area.


All times are GMT -4. The time now is 17:53.