scholarly journals Characterization of rigid porous medium via ultrasonic reflected waves at oblique incidence

2015 ◽  
Vol 138 (3) ◽  
pp. 1940-1940
Author(s):  
Mustapha Sadouki ◽  
Amine Berbiche ◽  
Mohamed fellah ◽  
Zine El Abidine fellah ◽  
Claude Depollier
Keyword(s):  
Porous Medium ◽  
Oblique Incidence ◽  
Reflected Waves

scholarly journals Characterization of rigid porous medium via ultrasonic reflected waves at oblique incidence

2015 ◽  
Author(s):  
Mustapha Sadouki ◽  
Amine Berbiche ◽  
Mohamed Fellah ◽  
Zine E. A. Fellah ◽  
Claude Depollier
Keyword(s):  
Porous Medium ◽  
Oblique Incidence ◽  
Reflected Waves

Characterization of the crossover from capillary invasion to viscous fingering to fracturing during drainage in a vertical 2D porous medium

2014 ◽  
Vol 58 ◽  
pp. 279-291 ◽  
Author(s):  
Amina Islam ◽  
Sylvie Chevalier ◽  
Imen Ben Salem ◽  
Yves Bernabe ◽  
Ruben Juanes ◽  
...  
Keyword(s):  
Porous Medium ◽  
Viscous Fingering

Characterization of Pore Diameters in Highly Porous Media

2003 ◽  
Author(s):  
H. L. Pan ◽  
O. Pickena¨cker ◽  
D. Trimis
Keyword(s):  
Porous Medium ◽  
Porous Media ◽  
Pore Diameter ◽  
Laminar Flame ◽  
Combustible Mixture ◽  
Critical Conditions ◽  
Flame Velocity ◽  
Geometrical Properties ◽  
Highly Porous

In this paper, a method for the experimental characterization of the equivalent pore diameter of highly porous open structures is presented. The commonly used characterization of such structures through geometrical properties like ppi number (porous per inch) and porosity proves to be not sufficient for the characterization of length scales related to heat and mass transfer. The procedure used here utilizes the quenching limits for flame propagation as characterization criterion. The determined equivalent pore diameter corresponds to the quenching diameter for a tube-geometry filled with the same combustible mixture. The quenching limit was determined by adjusting critical conditions, which are defined by a constant critical Pe´clet number comprising the laminar flame velocity instead of the flow velocity. Variations of oxygen content and air ratio were used in order to change the laminar flame speed and find the quenching limit for a given porous medium. The equivalent pore diameter determined with this method is a characteristic length scale of the porous medium geometry and is related to the heat transfer between the gas phase and the solid porous structure. The validation of the method was performed on sphere packings with well-documented properties. Several practically relevant highly porous media like foams and fabric lamellae structures were characterized and the results are discussed. Based on the effective heat conductivity (EHC) models of Zehner, Bauer and Schlu¨nder [1–3] for packed beds, an adapted model for foam structures was developed. The adapted model utilizes the equivalent pore diameters determined in the paper and predictions are presented.

CHARACTERIZATION OF POROUS MEDIA WITH GEOMETRICAL MULTIFRACTALS

Fractals ◽  
1993 ◽  
Vol 01 (04) ◽  
pp. 894-903 ◽  
Author(s):  
ANTOINE SAUCIER ◽  
JIRI MULLER
Keyword(s):  
Porous Medium ◽  
Porous Media ◽  
Spatial Distribution ◽  
Multifractal Spectrum ◽  
Spatial Variations ◽  
Local Porosity

In a porous medium the local porosity often exhibits spatial variations. These variations can be characterized by a multifractal spectrum, as long as suitable scaling characteristics are present. We derive some of the properties of such geometrical multifractals, and discuss how the spatial distribution of a set is related to its multifractal spectrum.

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