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Phase decoupling frequency
The phase decoupling frequency
is the frequency beyond which it is
assumed that a motion of the fluid phase does not induce a motion of
the solid phase.
The motion of the solid phase is thus depending on mechanical
excitation only.
If no mechanical excitation is applied to the porous material, beyond the
phase decoupling frequency, the material skeleton (or solid phase) can
be considered as motionless.
An expression of the phase decoupling frequency is given by Zwikker and Kosten [ZK49]:
|
(1) |
where
is the static air flow resistivity of the material,
its open porosity and
its density.
References
[ZK49] Zwikker C. and Kosten C. W., Sound absorbin materials, Elsevier, New-York, 1949.
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