Evaluation of tortuosity in acoustic porous materials saturated by air
Jean F. Allard, Bernard Castagnède, Michel Henry, Walter Lauriks
Review of Scientific Instruments, Vol. 65, Issue 3, pp. 754–755 (1994)
10.1063/1.1145097
Abstract
Tortuosity is an important parameter for the prediction of the acoustical properties of porous sound absorbing materials. The evaluation of tortuosity by resistivity measurements is now used in several laboratories, although this method presents several drawbacks. In particular, the complete saturation by a conducting fluid of a porous foam having a high flow resistivity is difficult to obtain without partially damaging the structure of the cells. A simple technique based on ultrasonic wavespeed measurements in a material saturated by air is described. This method has been used previously only for water or superfluid helium saturated materials.
Topics
Field: Engineering · Subfield: Biomedical Engineering
Keywords
Tortuosity,Porosity,Materials science,Porous medium,Saturation (graph theory),Electrical resistivity and conductivity,Airflow,Composite material,Helium,Superfluid helium-4
UN Sustainable Development Goals
- Clean water and sanitation (0.57)
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