Abstract:The critical wave number of an ultrasonic slow wave can be directly related to the permeability of the porous material. In particular, this technique can be used to identify pore closure in a porous medium such as a micro-or ultrafiltration membrane. A 10.5 mm-thick porous alumina sample was tested using four broadband transducers with central frequencies from 1 MHz to 20 MHz. Experimental results demonstrate the sensitivity of this method to the change of permeability caused by closure of the pores. This tech… Show more
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