Miguel Bernard
James M. Sabatier
Natl. Ctr. for Phys. Acoust., Univ. of Mississippi, University, MS 38677
The effects on sound propagation is investigated in air-filled capillary-tube-type ceramic porous media that result from the presence of small quantities of absorbed water in the tube walls. Specific acoustic impedance measurements are performed for a rigid-backed sample for the cases of both porous and nonporous tube walls. For the nonporous tube walls measurements are performed on dry and water wetted walls. Preliminary results suggest a contribution to the increased attenuation of sound in the air-filled porous samples due to the presence of a thin water film. [Work supported in part by ONR.]