Air Permeability - Air Permeability The principle of the...

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A ir P ermeability The principle of the test is that air is drawn through a specified area of fabric. The rate of airflow is adjusted until a specified pressure difference between the two fabric surfaces ( face and back ) is achieved. The airflow is measured and the air permeability is calculated. Permeability needs to be measured, either directly ( using Darcy's law ) or through estimation using empirically derived formulas. A common unit for permeability is the Darcy (D), or more commonly the millidarcy (mD).
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(1 Darcy 10 −12 m 2 ) Other units are cm 2 and the SI m 2 . Permeability is part of the proportionality constant in Darcy's law which relates discharge ( flow rate ) and fluid physical properties ( e.g. viscosity ) , to a pressure gradient applied to the porous media. For a rock to be considered as an exploitable hydrocarbon reservoir without stimulation, its permeability must be greater than approximately P A L q K
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C lassification o f P ermeability A bsolute P ermeability
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