Results 261 to 270 of about 21,192 (293)
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NMR in Biomedicine, 1995
AbstractRecent developments in solid‐boundary porous‐media theory have shown that useful structural information can be extracted from the time‐dependent diffusion coefficient, D(t), of the fluid filling the interstitial space. This theoretical framework provides a basis from which to understand the results from diffusion experiments performed in other ...
K G, Helmer, B J, Dardzinski, C H, Sotak
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AbstractRecent developments in solid‐boundary porous‐media theory have shown that useful structural information can be extracted from the time‐dependent diffusion coefficient, D(t), of the fluid filling the interstitial space. This theoretical framework provides a basis from which to understand the results from diffusion experiments performed in other ...
K G, Helmer, B J, Dardzinski, C H, Sotak
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Using Mindlin theory to model friction-dependent shear modulus in granular media
Geophysics, 2010Abstract An explicit expression for the effective shear modulus of a random packing of identical spheres is derived as a function of Mindlin's tangential stiffness with interparticle contact friction. The motivation behind the approach is to incorporate the effect of intergrain friction to predict velocities in unconsolidated sands ...
Kenneth Duffaut +2 more
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Fractals, 2015
Accurate prediction of the saturation dependence of different modes of transport in porous media, such as those due to conductivity, air permeability, and diffusion, is of broad interest in engineering and natural resources management. Most current predictions use a "bundle of capillary tubes" concept, which, despite its widespread use, is a severely ...
BEHZAD GHANBARIAN +3 more
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Accurate prediction of the saturation dependence of different modes of transport in porous media, such as those due to conductivity, air permeability, and diffusion, is of broad interest in engineering and natural resources management. Most current predictions use a "bundle of capillary tubes" concept, which, despite its widespread use, is a severely ...
BEHZAD GHANBARIAN +3 more
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A Frequency-dependent Velocity Prediction Model Based on Double-porosity Media Theory
78th EAGE Conference and Exhibition 2016, 2016A new frequency-dependent rock physics model is proposed to predict velocity. Generally, Kuster-Toksoz (KT) and Gassmann model are used to calculate dry rock and saturated rock modulus respectively. However, on the one hand, this traditional method can only compute single frequency band velocity; on the other hand, the Gassmann equation ignores ...
S.Z. Sun +3 more
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Basic theories for strain localization analysis of porous media with rate dependent model
Science Bulletin, 2005This paper analyzes the interaction between two kinds of internal length scales when the rate dependent plasticity is introduced to a multiphase material model to study the dynamic strain localization phenomenon of saturated and partially saturated porous media. The stability analysis demonstrates that the enhanced porous media model preserves the well-
Hongwu Zhang, Jianmin Qin
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Transport in Porous Media, 2009
A theory is developed providing a rational framework for spatial scale- dependent fluid’s flow and heat transfer, and mass of a component migrating with it through porous media. Introducing the assumption of a non-Brownian type motion and referring to asymptotic expansion in powers of a small defined parameter, we develop a novel approach associated ...
Shaul Sorek, Daniel Ronen, Vitaly Gitis
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A theory is developed providing a rational framework for spatial scale- dependent fluid’s flow and heat transfer, and mass of a component migrating with it through porous media. Introducing the assumption of a non-Brownian type motion and referring to asymptotic expansion in powers of a small defined parameter, we develop a novel approach associated ...
Shaul Sorek, Daniel Ronen, Vitaly Gitis
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New Theory for Forced Convection Through Porous Media by Fluids With Temperature-Dependent Viscosity
Journal of Heat Transfer, 2001A theoretical analysis is performed to predict the effects of a fluid with temperature-dependent viscosity flowing through an isoflux-bounded porous medium channel. For validation purposes, the thermo-hydraulic behavior of this system is obtained also by solving numerically the differential balance equations.
Arunn Narasimhan +2 more
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Some uniqueness and continuous dependence results in the micropolar mixture theory of porous media
International Journal of Engineering Science, 2006The present paper studies the uniqueness and continuous data dependence of solutions of the initial-boundary value problem associated with the micropolar mixture linear theory of porous media. For a binary homogeneous mixture of an isotropic micropolar elastic solid with an incompressible micropolar viscous fluid, an uniqueness result is established ...
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2008
Abstract An extended theory on the coherence function of log amplitude and phase for waves passing through random media is developed for a depth‐dependent background medium using the WKBJ‐approximated Green's function, the Rytov approximation, and the stochastic theory of the random velocity field.
Yingcai Zheng, Ru‐Shan Wu
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Abstract An extended theory on the coherence function of log amplitude and phase for waves passing through random media is developed for a depth‐dependent background medium using the WKBJ‐approximated Green's function, the Rytov approximation, and the stochastic theory of the random velocity field.
Yingcai Zheng, Ru‐Shan Wu
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