The effect of rank, lithotype and roughness on contact angle measurements in coal cleats

Mahoney, Shilo A.; Rufford, Thomas E.; Johnson, David W.; Rodrigues, Sandra; Esterle, Joan; Rudolph, Victor; Steel, Karen M.

doi:10.1016/j.coal.2017.07.001

Cited by 45 publications

(29 citation statements)

References 62 publications

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“…To investigate the oxidant effect on coal cleats, we used the cleat flow cell (CFC) reported by Mahoney et al (2017) to observe the change in the width of artificial channels in coals before and after oxidation by flowing oxidant through scribed channels.…”

Section: Cleat Flow Cell (Cfc)mentioning

confidence: 99%

A preliminary study of oxidant stimulation for enhancing coal seam permeability: Effects of sodium hypochlorite oxidation on subbituminous and bituminous Australian coals

Jing

Mahoney

Rodrigues

et al. 2018

International Journal of Coal Geology

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Section: Cleat Flow Cell (Cfc)mentioning

confidence: 99%

A preliminary study of oxidant stimulation for enhancing coal seam permeability: Effects of sodium hypochlorite oxidation on subbituminous and bituminous Australian coals

Jing

Mahoney

Rodrigues

et al. 2018

International Journal of Coal Geology

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“…Fabrication of geomaterial microfluidics has received attention in the fields of hydrology and petroleum engineering, in which pore-scale flow and/or transport is often dictated by surface chemistry (Bowden et al 2016;Gerami et al 2017;Mahoney et al 2015Mahoney et al , 2017Morais et al 2016;Oh et al 2017;Porter et al 2015b;Song et al 2014;Tanino et al 2018;Wang et al 2017;Zhang et al 2018). In Fig.…”

Section: Geomaterials Microfluidicsmentioning

confidence: 99%

Microfluidics for Porous Systems: Fabrication, Microscopy and Applications

et al. 2018

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No matter how sophisticated the structures are and on what length scale the pore sizes are, fluid displacement in porous media can be visualized, captured, mimicked and optimized using microfluidics. Visualizing transport processes is fundamental to our understanding of complex hydrogeological systems, petroleum production, medical science applications and other engineering applications. Microfluidics is an ideal tool for visual observation of flow at high temporal and spatial resolution. Experiments are typically fast, as sample volume is substantially low with the use of miniaturized devices. This review first discusses the fabrication techniques for generating microfluidics devices, experimental setups and new advances in microfluidic fabrication using three-dimensional printing, geomaterials and biomaterials. We then address multiphase transport in subsurface porous media, with an emphasis on hydrology and petroleum engineering applications in the past few decades. We also cover the application of microfluidics to study membrane systems in biomedical science and particle sorting. Lastly, we explore how synergies across different disciplines can lead to innovations in this field. A number of problems that have been resolved, topics that are under investigation and cutting-edge applications that are emerging are highlighted. Keywords Microfluidics • Porous media • Flow visualization • On-a-chip applications • Lab-on-a-chip • Micromodels Alireza Gerami and Yara Alzahid have contributed equally to this manuscript.

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“…Hudson et al and Liu et al separately discussed different effective medium theories and determined the fracture size, porosity, and relative permeability of uid-saturated materials with their fractures aligned with longitudinal wave (Hudson et al, 2001 ;Liu et al, 2015). Mahoney et al studied the dependence of coal grade and lithology on coal wettability, which provided a basis for the improved relative permeability model (Mahoney et al, 2017). Recently, Liu explored the relationships of water saturation, porosity, permeability, micro-cracks as well as coal grade to longitudinal wave velocity with focus on quantitatively measuring the relationship between water saturation and longitudinal wave velocity by nuclear magnetic resonance (Liu et al,2017).…”

Section: Introductionmentioning

confidence: 99%

Effects of Briquettes with Different Crack Structures on Propagation Characteristics of Ultrasonic Waves under Wetting Conditions

Wang

Liu

et al. 2020

Preprint

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In order to examine the effect of briquettes with different crack structures on ultrasonic characteristics under different wetting conditions, a series of ultrasonic testing are carried out on briquettes at different wetting heights and the ultrasonic characteristics in these coal samples are explored. The results show that ultrasonic amplitude is positively correlated with the emission voltage, whereas ultrasonic frequency is negatively correlated with the emission voltage. Changes in both are closely related to the particle size and density. The ultrasonic velocity is positively correlated with the wetting degree. Sample mass has the greatest effect on the ultrasonic velocity, followed by particle size, and pressure has the smallest effect. At dry stage, ultrasonic velocity in gas coal is less than that in bituminous coal. The opposite is true in the fully wet state. The influence of crack thickness on ultrasonic velocity gradually increases with the wetting degree increasing. At dry stage, the velocity gradually increases with the crack dip increasing, while as the wetting height increasing, magnitude of velocity increase gradually decreases with the dip increasing. The ultrasonic attenuation in the briquettes reduces with the emission voltage enhancing. The attenuation decreases with sample particle size, crack thickness and crack size decreasing and with sample mass, pressure and crack dip increasing. The ultrasonic attenuation shows a trend of increase before decrease with the wetting height increasing. The attenuation of ultrasonic wave increases with wave velocity increasing for intact samples and shows a trend of increase before decrease for cracked samples.

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The effect of rank, lithotype and roughness on contact angle measurements in coal cleats

Abstract: We report the effect of rank and lithotype on the wettability of coal in microfluidic experiments in two types of artificial microchannels; (1) reactive ion etched (RIE) channels and (2) die-cast channels prepared by pressing powdered lithotype concentrates.

Cited by 45 publications

References 62 publications

A preliminary study of oxidant stimulation for enhancing coal seam permeability: Effects of sodium hypochlorite oxidation on subbituminous and bituminous Australian coals

A preliminary study of oxidant stimulation for enhancing coal seam permeability: Effects of sodium hypochlorite oxidation on subbituminous and bituminous Australian coals

Microfluidics for Porous Systems: Fabrication, Microscopy and Applications

Effects of Briquettes with Different Crack Structures on Propagation Characteristics of Ultrasonic Waves under Wetting Conditions

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