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Viscous characteristic length
The viscous characteristic length, usually represented by letter
, is a parameter used to describe the
viscous effects at medium and high acoustical frequencies. This
parameter has been introduced by Johnson, Koplik and Dashen [JKD87].
Schematic representation of a pore. The viscous characteristic length, controlling the viscous effects at medium and high acoustical frequencies is related to the size of the inter-connection between two pores.
The viscous characteristic length can be estimated from standing wave tube measurements or ultrasound techniques.
References
[JKD87] Johnson D. L., Koplik J. and Dashen R.,
Theory of dynamic permeability and tortuosity in fluid-saturated porous media,
J. Fluid Mech., 176, 1987, pp. 379-402
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