4
votes
Accepted
What is "flow instability" in porous media?
So, I've only been able to find the abstract of the paper but it seems to outline the basic concept.
The device in question is forcing air through a porous ceramic medium in order to dissipate the ...
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4
votes
How safe is this assumption for turbulence modelling in porous media?
It is just saying that since there is no turbulence or dissipation being computed; your solution will be less accurate for lower and lower permeability. As I read it; eddy currents in this model will ...
- 7,794
2
votes
Accepted
Is there a relation between porosity and PPI density in porous media?
The answer is system specific. That is, unless you know something else about the structure of your porous material, there is no clear relation between pore density and pore size. A simplified 2D ...
- 498
1
vote
Small building basement foundation moisture: permeable vs impermeable
You are missing seepage with humidity. Seepage is the infiltration of water into the living space (basement) and makes the space wet or moist. It does cause concern about humidity, but seepage alone ...
- 8,084
1
vote
Accepted
Up flow vs down flow through a porous fixed bed
With gravity assisted flow, you have a higher potential of channel flow through the media, so sections of your plant packing won't be wetted by the solvent. Making sure you have the optimal flow ...
- 478
1
vote
Accepted
How to force creating a conformal mesh interface between zones in Fluent?
I found the issue addressed in Fluent user guide:
Parts are groups or collections of bodies. Parts can include multiple
bodies and are then referred to as multibody parts. If your
geometry contains ...
- 2,160
1
vote
Accepted
How safe is this assumption for turbulence modelling in porous media?
Short answer: The FLUENT approach is trivial.
Many information are lost due to the space-averaging process - over a representative elementary volume - of the governing equations (which is the essence ...
- 2,160
1
vote
What is "flow instability" in porous media?
Expanding Dan's answer (after some research), The main reasons for the so-called instability in porous media that is subjected to a heat flux (e.g. Solar irradiance) with air as a working medium are ...
- 2,160
1
vote
What is "flow instability" in porous media?
In the unstable sense, the reactor will become a fludizied bed reactor. i.e. the different flow densities will cause some spots to flow more than others. This means that "wide" openings, with more ...
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