The influence of moisture and recycled porous medium on the acoustical properties of soil substratum used on green noise barriers and absorbing building facades.

2010 ◽  
Vol 128 (4) ◽  
pp. 2367-2367
Author(s):  
Kirill Horoshenkov ◽  
Amir Khan ◽  
Hadj Benkreira ◽  
Agnès Mandon
Keyword(s):  
Porous Medium ◽  
Noise Barriers ◽  
Acoustical Properties ◽  
Building Facades ◽  
Green Noise ◽  
Properties Of Soil

Determination of Physical Properties of Isotropic Porous Materials by Impedance Tube

2009 ◽  
Author(s):  
Sanjay Sharma ◽  
Dennis Siginer
Keyword(s):  
Porous Medium ◽  
Fluid Flow ◽  
Physical Properties ◽  
Porous Materials ◽  
Low Frequency ◽  
Permeability Measurement ◽  
Impedance Tube ◽  
Acoustical Properties ◽  
Acoustical Method

Simulation of fluid flow in porous materials depends upon the accuracy of permeability measurement. This study details the development of an acoustical method to determine permeability of porous medium. Standardized acoustical testing for low frequency using impedance tube is carried out to determine the acoustical properties of the fibers. Physical properties of porous medium are determined by reverse calculation from the acoustical properties. The acoustical method is validated by comparing the measured acoustical properties of the porous medium by the analytical method. A variety of foams and fibers are tested using this methodology.

Determination of Hydraulic Properties of Soil as a Porous Medium

2001 ◽  
Vol 2 (1) ◽  
pp. 120-124
Author(s):  
A.A. Siyal . ◽  
A.G. Siyal . ◽  
Z.A. Abro . ◽  
F.C. Oad . ◽  
M.A. Samo . ◽  
...  
Keyword(s):  
Porous Medium ◽  
Hydraulic Properties ◽  
Properties Of Soil

Modelling Of Transport And Capture Of Particles In A Porous Medium

2019 ◽  
pp. 56-60
Keyword(s):  
Porous Medium ◽  
Asymptotic Solution ◽  
Retention Mechanism ◽  
Inverse Filtering ◽  
Underground Structures ◽  
Loose Soil ◽  
Monodisperse Suspension ◽  
Homogeneous Porous Medium ◽  
Model Equations ◽  
Pass Through

The study of the transport and capture of particles moving in a fluid flow in a porous medium is an important problem of underground hydromechanics, which occurs when strengthening loose soil and creating watertight partitions for building tunnels and underground structures. A one-dimensional mathematical model of long-term deep filtration of a monodisperse suspension in a homogeneous porous medium with a dimensional particle retention mechanism is considered. It is assumed that the particles freely pass through large pores and get stuck at the inlet of small pores whose diameter is smaller than the particle size. The model takes into account the change in the permeability of the porous medium and the permissible flow through the pores with increasing concentration of retained particles. A new spatial variable obtained by a special coordinate transformation in model equations is small at any time at each point of the porous medium. A global asymptotic solution of the model equations is constructed by the method of series expansion in a small parameter. The asymptotics found is everywhere close to a numerical solution. Global asymptotic solution can be used to solve the inverse filtering problem and when planning laboratory experiments.

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