A Model for Thermal Conductivity of Granular Porous Media

1992 ◽  
Vol 114 (2) ◽  
pp. 505-508 ◽  
Author(s):  
F. B. Nimick ◽  
J. R. Leith
Keyword(s):  
Thermal Conductivity ◽  
Porous Media ◽  
Granular Porous Media

Experimental and Numerical Research on Effective Thermal Conductivity of Granular Porous Media

2011 ◽  
Vol 320 ◽  
pp. 353-358
Author(s):  
Yu Feng Shi ◽  
Wen Ce Sun ◽  
Li Hua Shi ◽  
Jing Cui
Keyword(s):  
Thermal Conductivity ◽  
Porous Media ◽  
Effective Thermal Conductivity ◽  
Experimental System ◽  
Two Dimensional ◽  
Infinite Body ◽  
Fractal Method ◽  
Granular Porous Media ◽  
Unsteady Heat Conduction ◽  
Numerical Research

Effective thermal conductivity of granular porous media is investigated by experimental and numerical methods. Using the unsteady heat conduction formula of semi-infinite body, effective thermal conductivity is obtained by measuring temperature field of the experimental system. In this experiment, solid particle is pebble and pore fluid is water or brine with salinity of 20.2%. Granular porous media is not applicable for fractal method, therefore based on structural character of granular porous media; two-dimensional cylinder model is used to calculate effective thermal conductivity of granular porous media in this paper. The simulation results correspond well with the experimental results. This proves that calculating effective thermal conductivity of granular porous media by using this two-dimensional model is accurate. This model could be extrapolated to unsaturated porous media. Research shows that effective thermal conductivity increases logarithmically with the increasing of saturation.

Effect of deformation on the thermal conductivity of granular porous media with rough grain surface

2017 ◽  
Vol 44 (16) ◽  
pp. 8285-8293 ◽  
Author(s):  
Roohollah Askari ◽  
S. Hossein Hejazi ◽  
Muhammad Sahimi
Keyword(s):  
Thermal Conductivity ◽  
Porous Media ◽  
Granular Porous Media ◽  
Grain Surface

Analysis of process of emulsions transport in hydrophilic/oleophilic granular porous media driven by capillary force

2018 ◽  
Vol 2 (21) ◽  
pp. 85-101
Author(s):  
Olga Shtyka ◽  
Łukasz Przybysz ◽  
Mariola Błaszczyk ◽  
Jerzy P. Sęk
Keyword(s):  
Porous Media ◽  
Experimental Research ◽  
Granular Media ◽  
Single Phase ◽  
Influential Factor ◽  
Dispersed Phase ◽  
Porous Structures ◽  
Phase Concentration ◽  
Granular Porous Media ◽  
Kinetics Of

The research focuses on the issues concerning a process of multiphase liquids transport in granular porous media driven by the capillary pressure. The current publication is meant to introduce the results of experimental research conducted to evaluate the kinetics of the imbibition and emulsions behavior inside the porous structures. Moreover, the influence of the dispersed phase concentration and granular media structure on the mentioned process was considered. The medium imbibition with emulsifier-stabilized emulsions composed of oil as the dispersed phase in concentrations of 10 vol%, 30 vol%, and 50 vol%, was investigated. The porous media consisted of oleophilic/hydrophilic beads with a fraction of 200–300 and 600–800 μm. The experimental results provided that the emulsions imbibition in such media depended stronger on its structure compare to single-phase liquids. The increase of the dispersed phase concentration caused an insignificant mass decreasing of the imbibed emulsions and height of its penetration in a sorptive medium. The concentrations of the imbibed dispersions exceeded their initial values, but reduced with permeants front raise in the granular structures that can be defined as the influential factor for wicking process kinetics.

scholarly journals Waterfall Algorithm as a tool of investigation the geometrical features of granular porous media

2021 ◽  
Author(s):  
Wojciech Sobieski
Keyword(s):  
Particle Size ◽  
Porous Media ◽  
Lattice Boltzmann ◽  
Granular Media ◽  
Density Ratio ◽  
Geometrical Features ◽  
Granular Porous Media ◽  
Collision Density ◽  
Boltzmann Method ◽  
The Impact

AbstractThe paper describes the so-called Waterfall Algorithm, which may be used to calculate a set of parameters characterising the spatial structure of granular porous media, such as shift ratio, collision density ratio, consolidation ratio, path length and minimum tortuosity. The study is performed for 1800 different two-dimensional random pore structures. In each geometry, 100 individual paths are calculated. The impact of porosity and the particle size on the above-mentioned parameters is investigated. It was stated in the paper, that the minimum tortuosity calculated by the Waterfall Algorithm cannot be used directly as a representative tortuosity of pore channels in the Kozeny or the Carman meaning. However, it may be used indirect by making the assumption that a unambiguous relationship between the representative tortuosity and the minimum tortuosity exists. It was also stated, that the new parameters defined in the present study are sensitive on the porosity and the particle size and may be therefore applied as indicators of the geometry structure of granular media. The Waterfall Algorithm is compared with other methods of determining the tortuosity: A-Star Algorithm, Path Searching Algorithm, Random Walk technique, Path Tracking Method and the methodology of calculating the hydraulic tortuosity based on the Lattice Boltzmann Method. A very short calculation time is the main advantage of the Waterfall Algorithm, what meant, that it may be applied in a very large granular porous media.

scholarly journals Wettability-dependent Wave Velocities and Attenuation in Granular Porous Media

2021 ◽  
Author(s):  
Jimmy Xuekai Li ◽  
Reza Rezaee ◽  
Tobias M. Müller ◽  
Mahyar Madadi ◽  
Rupeng Ma ◽  
...  
Keyword(s):  
Porous Media ◽  
Wave Velocities ◽  
Granular Porous Media
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