On the experimental evaluation of the permeability in porous media using a gas flow method
Several studies indicate that experimental determination of porous medium permeability by a gas flow method may be influenced by gas properties and ambient temperature. In order to explain these influences, a very simple model is developed based on the idea that the flow in the porous medium may results...
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| Format: | article |
| Language: | eng |
| Published: |
2012
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| Online Access: | http://hdl.handle.net/10174/5464 |
| Country: | Portugal |
| Oai: | oai:dspace.uevora.pt:10174/5464 |
| Summary: | Several studies indicate that experimental determination of porous medium permeability by a gas flow method may be influenced by gas properties and ambient temperature. In order to explain these influences, a very simple model is developed based on the idea that the flow in the porous medium may results from both pressure-driven and free molecular flows. Measurements of the permeability of sand and a woven fibrous material performed with air and helium flows seem to corroborate this view. Based on the approach developed, we also study the phenomenon known as slip, and a methodology to quantify the slip length is presented. |
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