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Viscous characteristic frequency
The viscous characteristic frequency
is frequential intersection of the asymptotic behviors for the visco-inertial flow in the pores.
Below ,
the viscous forces are predominant compared to inertial ones and the flow regime is dissipative.
Beyond ,
the inertial forces are predominant compared to the viscous ones.
The expression of the viscous characteristic frequency is:
|
(1) |
where
is the static air flow resistivity of the material,
its open porosity,
its tortuosity
(the high frequency limit strictly speaking) and
the density at rest of the air.
References
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