The threshold pressure is critical to characterizing multi-phase nonlinear flow through tight porous media under effective stress. Due the complex and heterogeneous pore structures, essential controls on of are not determined. In this study, based fractal theory, a theoretical model for gas–water two-phase proposed. derived considers stress, capillary pressure, boundary layer. predicted from de...

Highly porous carbon cryogels with tunable pore structure and chemical composition were synthesized through controlled hydrolysis and polycondensation reactions using different chemicals as precursors and either NaOH or hexamine (C6N12N4) as catalysts. Gelation was followed with freeze drying to preserve the highly porous structure during solvent removal and controlled pyrolysis of the organic ...

The numerical analysis of the mechanisms governing the flow in the porous region is of a priority interest for modeling porous media flows. The present study is a prerequisite for elaborating the efficient turbulence modeling techniques in porous media flows. The main objective of present study is to provide a detailed pore scale description of fluid flow and to analyze the formation of the coh...

Scientific image processing involves a variety of problems including image modeling, reconstruction, and synthesis. In this paper we develop a constrained sampling approach for porous media synthesis and reconstruction in order to generate artificial samples of porous media. Our approach is different from current porous media reconstruction methods in which the Gibbs probability distribution is...

it has been demonstrated that anxiety is accompanied by significant warm up in the periorbital area. this warm up was attributed to the increased blood circulation in the area around the eyes. the whole pattern makes physiological and evolutionary sense since it represents a mechanism to facilitate rapid eye movements during preparedness for fight. this increased blood flow dissipates convectiv...

This paper presents the architecture and implementation of a multi-service streaming system for broadcast of MPEG4 elementary streams. The proposed system promotes the use of the push channel model for information distribution [1]. The system architecture accommodates two main layers for broadcast service management and media delivery. The broadcast service management layer uses the publisher-s...

A novel numerical formulation of the two-phase macroscopic balance equations governing the flow field in incompressible porous media is presented. The numerical model makes use of the Weighted Average Flux (WAF) method and Total Variation Diminishing (TVD) flux limiting techniques, and results in a second-order accurate scheme. A shock tube study was carried out to examine the interaction of a ...

This study investigates the effect of modeling the slatted floor as porous media on prediction of ammonia emissions and airflow patterns. Two approaches to determine the resistance coefficients of porous media modeling are adopted by using two geometries in CFD modeling. The results reveal that the ammonia emission with slatted floor modeled as actual size (SLM) is generally lower than the valu...

Nuclear magnetic resonance measurements of scale dependent dynamics in a random solid open-cell foam reveal a characteristic length scale for transport processes in this novel type of porous medium. These measurements and lattice Boltzmann simulations for a model foam structure indicate dynamical behavior analogous to lower porosity consolidated granular porous media, despite extremely high por...

In this paper, we discuss some applications of multiscale finite element methods to two-phase immiscible flow simulations in heterogeneous porous media. We discuss some extensions of multiscale finite element methods which take into account some limited global information. These methods are well suited for channelized porous media, where the long-range effects are important. This is typical for...