On-chip porous media: Porosity and permeability measurements

Joseph, Jerry; Gunda, Naga Siva Kumar; Mitra, Sushanta K.

doi:10.1016/j.ces.2013.05.065

Cited by 47 publications

(31 citation statements)

References 71 publications

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“…R100, Thermo 257 Scientific TM ) excited by UV light (X-Cite series 120Q, Lumen media. [60][61][62][63] The slope of pressure drop versus flow rate curves differs in the forward and in the backward directions. This difference, also known as directional permeability, is typical for an anisotropic pore-shape structure.…”

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confidence: 99%

Microfluidic rectifier for polymer solutions flowing through porous media

2019

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Fluidic rectification refers to anisotropic flow resistance upon changing the flow direction. Polymeric solutions, in contrast to Newtonian fluids, can exhibit an anisotropic flow resistance in microfluidic devices by tuning the channel shape at low Reynolds number. Such a concept has not been investigated in an anisotropic porous medium. We have developed a fluidic rectifier based on an anisotropic porous medium consisting of a periodic array of triangular pillars that can operate at a low Reynolds number. Rectification is achieved, when the type of high Weissenberg number elastic instabilities changes with the flow direction. The flow resistance differs across the two directions of the anisotropic porous medium geometry. We have identified the type of elastic instabilities that appear in both forward and backward directions. Particularly, we found a qualitative relation between the dead-zone instability and the onset of fluidic rectification.

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confidence: 99%

Microfluidic rectifier for polymer solutions flowing through porous media

2019

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“…Joseph et al measured the permeability of four different types of pore networks by measuring the absolute pressure near the inlet of the microfluidic chip [19]. The outlet tubing of the chip was open to atmosphere.…”

Section: Methods Detailsmentioning

confidence: 99%

A semi-experimental procedure for the estimation of permeability of microfluidic pore network

et al. 2019

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“…Porosity and permeability K measurements are mainly conducted on a laboratory scale using core-flooding experimental systems [228]. Volumetric measurements of core samples like petrographic image analysis (PIA), mercury injection methods and fluid re-saturation methods are used to assess porosity [229].…”

Section: Permeability/porositymentioning

confidence: 99%

Modelling Methods and Validation Techniques for CFD Simulations of PEM Fuel Cells

et al. 2021

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The large-scale adoption of fuel cells system for sustainable power generation will require the combined use of both multidimensional models and of dedicated testing techniques, in order to evolve the current technology beyond its present status. This requires an unprecedented understanding of concurrent and interacting fluid dynamics, material and electrochemical processes. In this review article, Polymer Electrolyte Membrane Fuel Cells (PEMFC) are analysed. In the first part, the most common approaches for multi-phase/multi-physics modelling are presented in their governing equations, inherent limitations and accurate materials characterisation for diffusion layers, membrane and catalyst layers. This provides a thorough overview of key aspects to be included in multidimensional CFD models. In the second part, advanced diagnostic techniques are surveyed, indicating testing practices to accurately characterise the cell operation. These can be used to validate models, complementing the conventional observation of the current–voltage curve with key operating parameters, thus defining a joint modelling/testing environment. The two sections complement each other in portraying a unified framework of interrelated physical/chemical processes, laying the foundation of a robust and complete understanding of PEMFC. This is needed to advance the current technology and to consciously use the ever-growing availability of computational resources in the next future.

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On-chip porous media: Porosity and permeability measurements

Cited by 47 publications

References 71 publications

Microfluidic rectifier for polymer solutions flowing through porous media

Microfluidic rectifier for polymer solutions flowing through porous media

A semi-experimental procedure for the estimation of permeability of microfluidic pore network

Modelling Methods and Validation Techniques for CFD Simulations of PEM Fuel Cells

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