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14 декабря, 2021
Сегодня каждый, кто собирается в отпуск и не знает, с кем оставить своего котика или кошку, может во[...]
FLOW RESISTIVITY
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The flow resistivity is defined by the ratio of the static pressure difference (AP )to the product of the velocity V and the thickness l of the porous sample, as given in Eq. (9). Its unit is Ns/m4
For measuring flow resistivity a sample of 25.4 mm thickness was used. With increasing the flow resistivity the sound absorption increases till an optimum value of the resistivity, beyond which the material reflects and the sound absorption decreases.