Modeling Coupled Transport, Aggregation, and In Situ Gelation of Nanoparticles in Porous Media

2017 ◽  
Author(s):  
Elsayed Abdelfatah ◽  
Maysam Pournik ◽  
Bor-Jier Ben Shiau ◽  
Jeffrey Harwell
Keyword(s):  
Porous Media ◽  
Coupled Transport ◽  
In Situ Gelation

An Experimental Study of the In-Situ Gelation of Chromium(+ 3)/Polyacrylamide Polymer in Porous Media

1986 ◽  
Vol 1 (06) ◽  
pp. 583-592 ◽  
Author(s):  
Chyi-Gang Huang ◽  
Don W. Green ◽  
Paul G. Willhite
Keyword(s):  
Experimental Study ◽  
Porous Media ◽  
In Situ Gelation

scholarly journals Flow Control in Porous Media: From Numerical Analysis to Quantitative μPAD for Ionic Strength Measurements

Sensors ◽  
2021 ◽  
Vol 21 (10) ◽  
pp. 3328
Author(s):  
Pouya Mehrdel ◽  
Hamid Khosravi ◽  
Shadi Karimi ◽  
Joan Antoni López Martínez ◽  
Jasmina Casals-Terré
Keyword(s):  
Porous Media ◽  
Limit Of Detection ◽  
Fluid Dynamic ◽  
Porous Membrane ◽  
External Pressure ◽  
Paper Substrate ◽  
Sensor Performance ◽  
Food Applications ◽  
Substrate Nature

Microfluidic paper-based analytical devices (µPADs) are a promising technology to enable accurate and quantitative in situ assays. Paper’s inherent hydrophilicity drives the fluids without the need for external pressure sources. However, controlling the flow in the porous medium has remained a challenge. This study addresses this problem from the nature of the paper substrate and its design. A computational fluid dynamic model has been developed, which couples the characteristics of the porous media (fiber length, fiber diameter and porosity) to the fluidic performance of the diffusion-based µPAD sensor. The numerical results showed that for a given porous membrane, the diffusion, and therefore the sensor performance is affected not only by the substrate nature but also by the inlets’ orientation. Given a porous substrate, the optimum performance is achieved by the lowest inlets’ angle. A diffusion-based self-referencing colorimetric sensor was built and validated according to the design. The device is able to quantify the hydronium concentration in wines by comparison to 0.1–1.0 M tartaric acid solutions with a 41.3 mM limit of detection. This research showed that by proper adjustments even the simplest µPADs can be used in quantitative assays for agri-food applications.

Microfluidic synthesis of monodisperse pectin hydrogel microspheres based on in situ gelation and settling collection

2016 ◽  
Vol 92 (1) ◽  
pp. 201-209 ◽  
Author(s):  
Chaeyeon Kim ◽  
Ki-Su Park ◽  
Jongmin Kim ◽  
Seong-Geun Jeong ◽  
Chang-Soo Lee
Keyword(s):  
In Situ Gelation ◽  
Hydrogel Microspheres

scholarly journals In Situ Characterisation of Three-Phase Flow in Mixed-Wet Porous Media Using Synchrotron Imaging.

2020 ◽  
Author(s):  
Alessio Scanziani ◽  
Abdulla Alhosani ◽  
Qingyang Lin ◽  
Catherine Spurin ◽  
Gaetano Garfi ◽  
...  
Keyword(s):  
Porous Media ◽  
Phase Flow ◽  
Three Phase ◽  
Three Phase Flow ◽  
Synchrotron Imaging

A coupled transport-crystallization FE model for porous media

2010 ◽  
pp. 471-479
Author(s):  
H Derluyn ◽  
R Espinosa-Marzal ◽  
P Moonen ◽  
J Carmeliet
Keyword(s):  
Porous Media ◽  
Fe Model ◽  
Coupled Transport

scholarly journals On the measurement of solute concentrations in 2-D flow tank experiments

2007 ◽  
Vol 4 (6) ◽  
pp. 4175-4210
Author(s):  
M. Konz ◽  
P. Ackerer ◽  
E. Meier ◽  
P. Huggenberger ◽  
E. Zechner ◽  
...  
Keyword(s):  
Porous Media ◽  
Resistivity Measurement ◽  
Power Laws ◽  
Image Resolution ◽  
Porous Media Flow ◽  
Photometric Method ◽  
Analysis Method ◽  
Resistivity Method ◽  
Concentration Time Series

Abstract. In this study we describe and compare photometric and resistivity measurement methodologies to determine solute concentrations in porous media flow tank experiments. The first method is the photometric method, which directly relates digitally measured intensities of a tracer dye to concentrations without previously converting the intensities to optical densities. This enables an effective processing of a large amount of images to compute concentration time series at various points of the flow tank. Perturbations of the measurements are investigated and both lens flare effects and the image resolution turned out to be the major sources of error. An attached mask is able to minimize the lens flare effects. The second method for in situ measurement of salt concentrations in porous media experiments is the resistivity method. The resistivity measurement system uses two different input voltages at gilded electrode sticks to enable the measurement of salt concentrations from 0 to 300 g/l. Power laws are used to relate apparent resistivity values and salt concentrations. However, due to the unknown measurement volume of the electrodes, we consider the image analysis method more appropriate for intermediate scale laboratory benchmark experiments to evaluate numerical codes.

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