scholarly journals Rayleigh waves in air saturated axisymmetrical soft porous media

2009 ◽  
Vol 106 (1) ◽  
pp. 014906 ◽  
Author(s):  
J. F. Allard ◽  
O. Dazel ◽  
J. Descheemaeker ◽  
N. Geebelen ◽  
L. Boeckx ◽  
...  
Keyword(s):  
Porous Media ◽  
Rayleigh Waves ◽  
Soft Porous Media

Capillarity in Soft Porous Solids

2020 ◽  
Vol 52 (1) ◽  
pp. 263-284 ◽  
Author(s):  
Jonghyun Ha ◽  
Ho-Young Kim
Keyword(s):  
Porous Media ◽  
Porous Materials ◽  
Porous Solids ◽  
Resurrection Plants ◽  
Wetting And Drying ◽  
Practical Applications ◽  
Capillary Interactions ◽  
Soft Porous Media ◽  
Experimental Findings ◽  
Physical Principles

Soft porous solids can change their shapes by absorbing liquids via capillarity. Such poro-elasto-capillary interactions can be seen in the wrinkling of paper, swelling of cellulose sponges, and morphing of resurrection plants. Here, we introduce physical principles relevant to the phenomena and survey recent advances in the understanding of swelling and shrinkage of bulk soft porous media due to wetting and drying. We then consider various morphing modes of porous sheets, which are induced by localized wetting and swelling of soft porous materials. We focus on physical insights with the aim of triggering novel experimental findings and promoting practical applications.

Foamability of soft porous media using compression

2019 ◽  
Vol 579 ◽  
pp. 123569 ◽  
Author(s):  
Phillip Johnson ◽  
Mauro Vaccaro ◽  
Connor O’Donnell ◽  
Anna Trybala ◽  
Victor Starov
Keyword(s):  
Porous Media ◽  
Soft Porous Media

scholarly journals Foam Formation by Compression/Decompression Cycle of Soft Porous Media

2020 ◽  
Vol 4 (3) ◽  
pp. 31
Author(s):  
Phillip Johnson ◽  
Mauro Vaccaro ◽  
Victor Starov ◽  
Anna Trybala
Keyword(s):  
Mechanical Properties ◽  
Porous Media ◽  
Porous Material ◽  
Foam Formation ◽  
Compression Device ◽  
The Media ◽  
Minimum Separation ◽  
Soft Porous Media ◽  
Predicted Values ◽  
Good Agreement

A theory of the amount of foam produced by compression/decompression cycles of a soft porous media is developed. The amount of foam produced was found to be dependent on both the amount of surfactant within the media and the minimum separation between the plates of the compression device. The latter is determined by the mechanical properties of the soft media. The theory also shows the importance of the decompression of the media as this is the mechanism of where the air penetrates into the soft porous material. The accumulated air is used during the compression stage for foam formation. The theoretically predicted values of foam mass are found to have good agreement with experimental observations, which validates the theory predictions. The theory also predicts independence of the foam produced in terms of the frequency of compression/decompression cycles, which agrees with our experimental observations.

Permeability of soft porous media under one-dimensional compaction

2011 ◽  
Vol 66 (1) ◽  
pp. 1-14 ◽  
Author(s):  
H.D. Akaydin ◽  
A. Pierides ◽  
S. Weinbaum ◽  
Y. Andreopoulos
Keyword(s):  
Porous Media ◽  
One Dimensional ◽  
Soft Porous Media

On the study of fluid flow in a soft porous media using a scaled-up indenter

2019 ◽  
Vol 76 ◽  
pp. 332-339 ◽  
Author(s):  
Qiuyun Wang ◽  
Zenghao Zhu ◽  
Rungun Nathan ◽  
Qianhong Wu
Keyword(s):  
Porous Media ◽  
Fluid Flow ◽  
Soft Porous Media

scholarly journals Foam Formation and Interaction with Porous Media

Coatings ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 143 ◽  
Author(s):  
Phillip Johnson ◽  
Mauro Vaccaro ◽  
Victor Starov ◽  
Anna Trybala
Keyword(s):  
Porous Media ◽  
Critical Micelle Concentration ◽  
Sodium Dodecyl ◽  
Surfactant Solution ◽  
Foam Formation ◽  
Compression Device ◽  
Time Interaction ◽  
The Media ◽  
Soft Porous Media ◽  
First Time

Foams are a common occurrence in many industries and many of these applications require the foam to interact with porous materials. For the first time interaction of foams with porous media has been investigated both experimentally and theoretically by O. Arjmandi-Tash et al. It was found that there are three different regimes of the drainage process for foams in contact with porous media: rapid, intermediate and slow imbibition. Foam formation using soft porous media has only been investigated recently, the foam was made using a compression device with soft porous media containing surfactant solution. During the investigation, it was found that the maximum amount of foam is produced when the concentration of the foaming agent (dishwashing surfactant) is in the range of 60–80% m/m. The amount of foam produced was independent of the pore size of the media in the investigated range of pore sizes. This study is expanded using sodium dodecyl sulphate (SDS), which has the same critical micelle concentration as the commercial dishwashing surfactant, where the foam is formed using the same porous media and compression device. During the investigation, it was found that 10 times the critical micelle concentration (CMC) is the optimum concentration for a pure SDS surfactant solution to create foam. Any further increase in concentration after that point resulted in no further mass of foam being generated.

scholarly journals A homogenised model for flow, transport and sorption in a heterogeneous porous medium

2021 ◽  
Vol 932 ◽  
Author(s):  
L.C. Auton ◽  
S. Pramanik ◽  
M.P. Dalwadi ◽  
C.W. MacMinn ◽  
I.M. Griffiths
Keyword(s):  
Porous Medium ◽  
Porous Media ◽  
Multiple Scales ◽  
Effective Diffusivity ◽  
Rectangular Lattice ◽  
Mathematical Framework ◽  
Anisotropic Flow ◽  
Flow And Transport ◽  
Soft Porous Media ◽  
The Impact

A major challenge in flow through porous media is to better understand the link between microstructure and macroscale flow and transport. For idealised microstructures, the mathematical framework of homogenisation theory can be used for this purpose. Here, we consider a two-dimensional microstructure comprising an array of obstacles of smooth but arbitrary shape, the size and spacing of which can vary along the length of the porous medium. We use homogenisation via the method of multiple scales to systematically upscale a novel problem involving cells of varying area to obtain effective continuum equations for macroscale flow and transport. The equations are characterised by the local porosity, a local anisotropic flow permeability, an effective local anisotropic solute diffusivity and an effective local adsorption rate. These macroscale properties depend non-trivially on the two degrees of microstructural geometric freedom in our problem: obstacle size and obstacle spacing. We exploit this dependence to construct and compare scenarios where the same porosity profile results from different combinations of obstacle size and spacing. We focus on a simple example geometry comprising circular obstacles on a rectangular lattice, for which we numerically determine the macroscale permeability and effective diffusivity. We investigate scenarios where the porosity is spatially uniform but the permeability and diffusivity are not. Our results may be useful in the design of filters or for studying the impact of deformation on transport in soft porous media.

Laser speckle probes of relaxation dynamics in soft porous media saturated by near-critical fluids

2014 ◽  
Vol 53 (10) ◽  
pp. B12 ◽  
Author(s):  
Dmitry A. Zimnyakov ◽  
Sergey P. Chekmasov ◽  
Olga V. Ushakova ◽  
Elena A. Isaeva ◽  
Victor N. Bagratashvili ◽  
...  
Keyword(s):  
Porous Media ◽  
Laser Speckle ◽  
Relaxation Dynamics ◽  
Soft Porous Media
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