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Special Issue "Fluids in Porous Media"

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Materials Chemistry".

Deadline for manuscript submissions: 31 July 2020.

Special Issue Editor

Dr. David Faux
E-Mail Website
Guest Editor
University of Surrey, Guildford, United Kingdom
Interests: Nuclear magnetic resonance; NMR relaxometry; mathematical modelling; cement-based materials; plaster; clays; wood; zeolites; molecular dynamics modelling; Monte Carlo modelling; paramagnetic image contrast agents; water; rheology; Lattice-Boltzmann modelling

Special Issue Information

Dear Colleagues,

Porous materials come in a wide variety of different forms and pervade our everyday lives. For example, buildings are constructed using cement- and clay-based materials, or wood. Household products such as toothpaste (silica), washing powder (zeolites) and diapers (hydrogels), noise and heat insulators, and filtration systems also rely on porous materials. The characterisation of rock is essential for hydrocarbon recovery viability assessment, and clays may be useful as potential radioactive waste storage sites. Polymer systems have applications in fuel cells, and protein systems and tissue have applications in medicine, pharmacy research and biomedical engineering.

For each of these systems, it is vital to understand the properties of the fluid contained within the porous media. This is intrinsic to the understanding of their properties and hence to the development of new and improved products. Hence, much highly-significant research is being undertaken in a wide variety of porous systems. For example, cement production is the third largest contributor to CO2 emissions worldwide, and understanding the nanoscale behaviour of water within cement products is pivotal to designing new products with a lower carbon footprint and improved durability.

Nonetheless, porous media are notoriously complex and obtaining reliable data on pore structure and the fluid contained in the pores is a significant challenge. Experimental techniques such as nuclear magnetic resonance (NMR) imaging are valuable, and NMR relaxometry experiments can yield information on the nanoscale behaviour of fluids. Small-angle X-ray scattering and quasi-elastic or small-angle neutron scattering have made important contributions to this field of research as have more conventional measurements used to estimate porosity, tortuosity and permeability.

Many of these experimental techniques are used in tandem with theoretical or computational modelling to infer the dynamics and nano-microstructure of a fluid and its confining matrix. Computer simulations are used at the atomic scale through ab initio quantum mechanical calculations, at the nanoscale through molecular dynamics, at the nano-to-micro scales through Monte Carlo methods,  at the macro-scale through Lattice-Boltzmann, and through conventional continuum-mechanics flow modelling at larger scales.

This Special Issue aims to cover recent progress and trends in the understanding of the behaviour of fluids in porous media. This may focus on experimental techniques, advances in understanding the specific porous materials, theoretical developments and applications of computer simulations.

Submissions on, but not limited, to the topics listed below are welcome. Types of contributions to this Special Issue may include full research articles, short communications, and reviews focusing on the properties of fluid in porous media.

Dr. David Faux
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Molecules is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2000 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • experimental techniques for probing fluids in porous material
  • computer modelling of fluid in porous media
  • cement-based materials such as cement paste, mortar, concrete and plaster
  • water and hydrocarbon fluid in rock
  • porous silica-based material
  • soft porous material
  • metal–organic systems
  • polymeric systems

Published Papers (3 papers)

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Research

Open AccessArticle
Effect of Initial Conformation on the Starch Biopolymer Film Formation Studied by NMR
Molecules 2020, 25(5), 1227; https://doi.org/10.3390/molecules25051227 - 09 Mar 2020
Abstract
The formation of a rigid porous biopolymer scaffold from aqueous samples of 1% w/v (suspension) and 5% w/v (gel) corn starch was studied using optical and nuclear magnetic resonance (NMR) techniques. The drying process of these systems was observed using a single-sided NMR [...] Read more.
The formation of a rigid porous biopolymer scaffold from aqueous samples of 1% w/v (suspension) and 5% w/v (gel) corn starch was studied using optical and nuclear magnetic resonance (NMR) techniques. The drying process of these systems was observed using a single-sided NMR scanner by application of the Carr–Purcell–Meiboom–Gill pulse sequence at different layer positions. The echo decays were analyzed and spin–spin relaxation times (T2) were obtained for each layer. From the depth dependent T2 relaxation time study, it was found that the molecular mobility of water within the forming porous matrix of these two samples varied notably at different stages of film formation. At an intermediate stage, a gradual decrease in mobility of the emulsion sample towards the air–sample interface was observed, while the gel sample remained homogeneous all along the sample height. At a later stage of drying, heterogeneity in the molecular dynamics was observed in both samples showing low mobility at the bottom part of the sample. A wide-angle X-ray diffraction study confirmed that the structural heterogeneity persisted in the final film obtained from the 5% corn starch aqueous sample, whereas the film obtained from the 1% corn starch in water was structurally homogeneous. Full article
(This article belongs to the Special Issue Fluids in Porous Media)
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Open AccessArticle
Unsteady Radiative Natural Convective MHD Nanofluid Flow Past a Porous Moving Vertical Plate with Heat Source/Sink
Molecules 2020, 25(4), 854; https://doi.org/10.3390/molecules25040854 - 14 Feb 2020
Abstract
In this research article, we investigated a comprehensive analysis of time-dependent free convection electrically and thermally conducted water-based nanofluid flow containing Copper and Titanium oxide (Cu and TiO 2 ) past a moving porous vertical plate. A uniform transverse magnetic field is imposed [...] Read more.
In this research article, we investigated a comprehensive analysis of time-dependent free convection electrically and thermally conducted water-based nanofluid flow containing Copper and Titanium oxide (Cu and TiO 2 ) past a moving porous vertical plate. A uniform transverse magnetic field is imposed perpendicular to the flow direction. Thermal radiation and heat sink terms are included in the energy equation. The governing equations of this flow consist of partial differential equations along with some initial and boundary conditions. The solution method of these flow interpreting equations comprised of two parts. Firstly, principal equations of flow are symmetrically transformed to a set of nonlinear coupled dimensionless partial differential equations using convenient dimensionless parameters. Secondly, the Laplace transformation technique is applied to those non-dimensional equations to get the close form exact solutions. The control of momentum and heat profile with respect to different associated parameters is analyzed thoroughly with the help of graphs. Fluid accelerates with increasing Grashof number (Gr) and porosity parameter (K), while increasing values of heat sink parameter (Q) and Prandtl number (Pr) drop the thermal profile. Moreover, velocity and thermal profile comparison for Cu and TiO 2 -based nanofluids is graphed. Full article
(This article belongs to the Special Issue Fluids in Porous Media)
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Open AccessArticle
Brownian Motion and Thermophoresis Effects on MHD Three Dimensional Nanofluid Flow with Slip Conditions and Joule Dissipation Due to Porous Rotating Disk
Molecules 2020, 25(3), 729; https://doi.org/10.3390/molecules25030729 - 07 Feb 2020
Abstract
This paper examines the time independent and incompressible flow of magnetohydrodynamic (MHD) nanofluid through a porous rotating disc with velocity slip conditions. The mass and heat transmission with viscous dissipation is scrutinized. The proposed partial differential equations (PDEs) are converted to ordinary differential [...] Read more.
This paper examines the time independent and incompressible flow of magnetohydrodynamic (MHD) nanofluid through a porous rotating disc with velocity slip conditions. The mass and heat transmission with viscous dissipation is scrutinized. The proposed partial differential equations (PDEs) are converted to ordinary differential equation (ODEs) by mean of similarity variables. Analytical and numerical approaches are applied to examine the modeled problem and compared each other, which verify the validation of both approaches. The variation in the nanofluid flow due to physical parameters is revealed through graphs. It is witnessed that the fluid velocities decrease with the escalation in magnetic, velocity slip, and porosity parameters. The fluid temperature escalates with heightening in the Prandtl number, while other parameters have opposite impacts. The fluid concentration augments with the intensification in the thermophoresis parameter. The validity of the proposed model is presented through Tables. Full article
(This article belongs to the Special Issue Fluids in Porous Media)
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