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October 13, 2014, 11:02 |
effect of porosity in the porous media
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#1 |
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Join Date: Jul 2014
Location: Portugal
Posts: 36
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Hello to all,
I am modeling two-phase flow (water and air) through a channel that as a porous and a non-porous region. I am confused about the effects of the porosity of the porous media in the simulation. By reading Fluent's manual I understand that, as I was expecting, porosity is the void space of the porous region, i.e., the space where the fluid(s) can flow. However, when i changed the porosity, the results are not as i expected. In the figure attached*, you can observed that increasing the porosity makes water to flow "slower" in the porous media, and i was expecting the opposite! * Air is entering at the upper part of the channel (from left to right) while water is entering at the bottom part of the channel (the porous media) and through a porous directly into the upper part of the channel I also found in Fluent's manual that porosity affects heat transfer properties (which is not considered here) and the time-derivative in the continuity equation. However, I don't understand how can this lead to the results i obtained. Can someone help me? Thanks! |
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October 22, 2014, 14:03 |
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#2 |
Member
Join Date: Jul 2014
Location: Portugal
Posts: 36
Rep Power: 12 |
The answer to this question:
"With a low porosity the physical velocity is higher and therefore the water would seem to flow faster. Essentially at low porosity there is less open volume and therefore for a given inlet volumetric flow the time to fill will reduce. At a porosity of 1 the volume is at its maximum and therefore the time to fill is longest." Thanks to David Stanbridge (swiftaircraft) |
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