Questions tagged [porous-medium]

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Up flow vs down flow through a porous fixed bed

How do I analyse for, or what do I need to consider, when comparing gravity-opposed vs gravity assisted flow in a tube containing a porous bed that partially shrinks (through partial mass loss) over a ...
2
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1answer
3k views

How to force creating a conformal mesh interface between zones in Fluent?

I am trying to perform simple 2D CFD analysis on Fluent having 3 adjacent zones(inlet, porous and outlet). The problem I have is whenever I select non-equilibrium thermal model in porous zone in Cell ...
7
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1answer
2k views

Is there a relation between porosity and PPI density in porous media?

I've seen two methods to describe porosity of porous media (specifically metal foams): Porosity $\epsilon$ which is a ratio between volume of voids and total volume of the medium. PPI (Pores Per Inch)...
4
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2answers
578 views

How safe is this assumption for turbulence modelling in porous media?

I am studying the performance of volumetric solar receivers (specifically ceramic foams) versus the change of many parameters: solar flux, surface temperature, porosity, pore diameter, flow pressure ...
7
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3answers
239 views

What is “flow instability” in porous media?

Pressure drop across a porous medium can be described by the Forchheimer extension to Darcy’s law: $$-\frac{dp}{dx} = \frac{\mu}{K_1}\cdot v + \frac{\rho}{K_2}\cdot v^2$$ where $K_1$ and $K_2$ are ...