On the relationship of the observed acoustical and related non-acoustical behaviours of nanofibers membranes using Biot- and Darcy-type models

There is a general lack of publications on the acoustical and related non-acoustical properties nanofibrous media. This work attempts to contribute this gap highlight problems associated with acoustic non-acoustic characterisation these materials. The work, presumably for first time, applies Biot- Darcy-type mathematical models explain observed behaviours nanofibres. It identifies theoretical gaps physical phenomena which can be responsible membranes it presents recommendations fill gaps. novelty in use robust model measured behaviour thin placed foam substrate. With actual flow resistivity nanofibers estimated from data. demonstrated that classical fibrous media does not when Knudsen number becomes greater than 0.02, i.e. then diameter nanofibres comparable mean free path.