The flow resistance of a material describes the pressure drop through a porous material sample based on the flow volume. It is measured according to DIN EN 29053 according to the direct airflow method on samples with a diameter of 100 mm.
Flow resistance is generally used for the evaluation of sound absorbing materials:
Input parameters for computational models
- The sound-absorbing properties of porous materials such as fabrics, fibre insulating materials, etc. can be described with the aid of mathematical models, wherein flow resistance represents an important input parameter.
Selection of suitable materials for Sound absorption
- Based on the flow resistance, a pre-selection of different materials intended for use as sound absorbers can be made.
- Flow resistance can also be used as a control parameter for sound-absorbing materials when monitoring production. (m|ars)