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Journal ArticleDOI

Characteristics of pore structure and fractal dimension of low-rank coal: A case study of Lower Jurassic Xishanyao coal in the southern Junggar Basin, NW China

01 Apr 2017-Fuel (Elsevier)-Vol. 193, pp 254-264
TL;DR: In this paper, a series of laboratory experiments were performed to firstly analyze the characteristics of the pore structure in low-rank coal (R o 1000nm), with a poor development of mesopores (100-1000nm).
About: This article is published in Fuel.The article was published on 2017-04-01. It has received 211 citations till now. The article focuses on the topics: Fractal analysis & Fractal dimension.
Citations
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Journal ArticleDOI
01 Dec 2017-Fuel
TL;DR: In this article, a combination of focused-ion beam-scanning electron microscopy (FIB-SEM) tomography and X-ray computed micro-tomography (X-ray μ-CT) was used to characterize 3D pore-fracture characteristics at different scales.

125 citations

Journal ArticleDOI
TL;DR: In this article, the pore structure and fractal characteristics of pulverized intact coal and tectonic coal, proximate analysis, gas adsorption/desorption, and N2 (77K) adaption experiments were performed.

118 citations

Journal ArticleDOI
15 Feb 2020-Fuel
TL;DR: In this article, coal samples were treated by ionic liquid with different concentrations and fractal dimensions were calculated to study the variation of pore characteristics and the fractal dimension of mesopores.

113 citations

Journal ArticleDOI
TL;DR: In this article, a simplified Sierpinski-like fractal model was proposed to further examine the evolution of the pore-fracture networks with higher measurement accuracy.

95 citations

Journal ArticleDOI
TL;DR: In this article, the fractal curves of the pores and fractures in coal samples with different particle sizes determined from MIP were all divided into two parts by an inflection point.

91 citations

References
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Journal ArticleDOI
TL;DR: A review of the physics of small volumes (nanoliters) of fluids is presented, as parametrized by a series of dimensionless numbers expressing the relative importance of various physical phenomena as mentioned in this paper.
Abstract: Microfabricated integrated circuits revolutionized computation by vastly reducing the space, labor, and time required for calculations. Microfluidic systems hold similar promise for the large-scale automation of chemistry and biology, suggesting the possibility of numerous experiments performed rapidly and in parallel, while consuming little reagent. While it is too early to tell whether such a vision will be realized, significant progress has been achieved, and various applications of significant scientific and practical interest have been developed. Here a review of the physics of small volumes (nanoliters) of fluids is presented, as parametrized by a series of dimensionless numbers expressing the relative importance of various physical phenomena. Specifically, this review explores the Reynolds number Re, addressing inertial effects; the Peclet number Pe, which concerns convective and diffusive transport; the capillary number Ca expressing the importance of interfacial tension; the Deborah, Weissenberg, and elasticity numbers De, Wi, and El, describing elastic effects due to deformable microstructural elements like polymers; the Grashof and Rayleigh numbers Gr and Ra, describing density-driven flows; and the Knudsen number, describing the importance of noncontinuum molecular effects. Furthermore, the long-range nature of viscous flows and the small device dimensions inherent in microfluidics mean that the influence of boundaries is typically significant. A variety of strategies have been developed to manipulate fluids by exploiting boundary effects; among these are electrokinetic effects, acoustic streaming, and fluid-structure interactions. The goal is to describe the physics behind the rich variety of fluid phenomena occurring on the nanoliter scale using simple scaling arguments, with the hopes of developing an intuitive sense for this occasionally counterintuitive world.

4,044 citations

Journal ArticleDOI
TL;DR: In this article, the authors present a tool for the selection and appraisal of the methods of characterization of porous solids, and also give the warnings and guidelines on which the experts generally agree.
Abstract: These recommendations aim to be a tool for the selection and appraisal of the methods of characterization of porous solids, and to also give the warnings and guidelines on which the experts generally agree. For this purpose, they successively consider the description of a porous solid (definitions, terminology), the principal methods available (stereology , radiation scattering, pycnometry, adsorption, intrusion, suction, maximum buble pressure, fluid flow, immersion or adsorption calorimetry, thermoporometry , size exclusion chromatography, Xenon NMR and ultrasonic methods) and finally the general principles which are worth being followed in the selection of the appropriate method.

3,257 citations

Journal ArticleDOI
TL;DR: In this paper, it is shown that the micropores are where most methane adsorption occurs in coal seams, and the methane molecule may actually stretch, minutely, the pore and thus with de-gassing of the reservoir, could result in matrix shrinkage, allowing opening of the fracture (cleat) system in the coal and thus enhancing permeability.

1,160 citations

Journal ArticleDOI
01 Jul 2010-Fuel
TL;DR: Wang et al. as mentioned in this paper proposed a new NMR-based per-meability model that better estimates the permeability of coals, which has potential applications for NMR well logging in coalbed methane exploration.

639 citations