Pore-scale modeling of complex transport phenomena in porous media

Chen, Li; He, Aihua; Zhao, Jianlin; Kang, Qinjun; Li, Zeng-Yao; Carmeliet, Jan; Shikazono, Naoki; Tao, Wen‐Quan

doi:10.1016/j.pecs.2021.100968

Cited by 207 publications

(77 citation statements)

References 403 publications

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“…Consequently, the different phenomena that lead to transport are each considered individually with the knowledge that the sum of their contributions must equal zero [7,8]. This principle is useful for computing many relevant quantities [9,10]. For example, in fluid mechanics, a common use of transport analysis is to determine the velocity profile of a fluid flowing through a rigid volume.…”

Section: Introductionmentioning

confidence: 99%

WITHDRAWN: Mathematical modeling of transport phenomena in chemical reactors

Chen

2022

Preprint

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Endothermic reactions performed in thermally integrated microchannel reactors are driven using heat from an external source. However, the temperature of the gas stream providing the heat is limited by constraints imposed by the materials of construction. This study relates to a thermochemical process for producing hydrogen by the catalytic endothermic reaction of methanol with steam in a thermally integrated microchannel reforming reactor. Computational fluid dynamics simulations are conducted to better understand the consumption, generation, and exchange of thermal energy between endothermic and exothermic processes in the reactor. The effects of wall heat conduction properties on heat transfer characteristics and reactor performance are investigated. Processes of conducting reactions in integrated combustion reactors are described and the results are presented. Particular reactor designs are also described. The results indicate that asymmetric operation requires spatial distribution of the feed for the exothermic reaction in order to prevent excess temperatures and to ensure stable operation. The peak reaction heat flux increases with the channel dimensions while maintaining the flow rates. The change in specific enthalpy is positive for the exothermic reaction and negative for the endothermic reaction. The change in specific sensible enthalpy is always positive. The thermal conductivity of the channel walls is fundamentally important. Materials with high thermal conductivity are preferred for the channel walls. Thermally conductive ceramics and metals are well-suited. The application of autothermal reactor concepts can be extended to endothermic high temperature reactions. Advantages are the compact design which allows fast start-up and load changes. Drawbacks include the dilution of the reforming product with nitrogen if air is used as oxidant.

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Section: Introductionmentioning

confidence: 99%

WITHDRAWN: Mathematical modeling of transport phenomena in chemical reactors

Chen

2022

Preprint

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“…To simulate multiphase flows, four main types of multiphase LB models have been developed: the color-gradient model [45,46], the pseudopotential model [47,48], the freeenergy model [49,50], and the phase-field model [51]. For detailed descriptions of these models, interested readers are directed to the comprehensive review papers [20,22,23]. Among them, the phase-field and pseudopotential models have been widely used in evaporation simulations [20].…”

Section: A Hybrid Pseudopotential Clbmmentioning

confidence: 99%

“…1). Recently, the mesoscopic lattice Boltzmann (LB) method has been used more and more widely for studying evaporation dynamics [6,8,[16][17][18][19], mainly due to its advantages of natural incorporation of micro/mesoscale physics, easy treatment of liquid-vapor interface, and highly efficient algorithm [20][21][22][23]. Ledesma-Aguilar et al [16] applied a phase-field LB method to simulate sessile droplet evaporation, driven by a concentration gradient, by manipulating the order parameter at the boundary to induce a chemical potential gradient.…”

Section: Introductionmentioning

confidence: 99%

Droplet evaporation in finite-size systems: Theoretical analysis and mesoscopic modeling

et al. 2022

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“…Numerical modeling is a common method to analyze the pore structure and predict the permeability of porous media, which is commonly divided into continuous scale and pore scale. The continuous-scale model based on the representative element volume can reasonably predict the macroscopic physical properties of porous media; however, the model size is much larger than the typical pore size of porous media, and the microscopic heterogeneity is ignored . Pore-scale modeling can fully consider the microscopic heterogeneity and reasonably explore the microscopic pore shape and topology. − Digital rock reconstruction and modeling based on micro-CT images have become an important means to obtain the pore-scale microscopic properties. − One can obtain the three-dimensional (3D) pore system nondestructively and directly under a certain observation scale , and highly restore the real pore morphology compared with other observation methods such as focused ion beam scanning electron microscopy, , nuclear magnetic resonance spectroscopy, , and mercury intrusion porosimetry .…”

Section: Introductionmentioning

confidence: 99%

Influence of Pore Morphology on Permeability through Digital Rock Modeling: New Insights from the Euler Number and Shape Factor

Qin

Xia

et al. 2022

Energy Fuels

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The microscopic pore shape and topology significantly affect fluid transport and occurrence in porous permeable rock. A quantitive characterization of the impact of pore morphology on permeability is currently lacking, which limits the efficient development of underground hydrocarbon resources. This work introduces the Euler number and shape factor to characterize the pore topology and shape of heterogeneous sandstone based on CT imaging. The pore morphology under different pore sizes and the correlation of the Euler number, shape factor, fractal dimension, and surface area are analyzed. Furthermore, a modified Kozeny–Carman equation is established to explain the influence of the Euler number and shape factor on permeability. The results show that with the increase of pore diameter, the Euler number decreases while the shape factor increases. In a connected pore system, the smaller Euler number corresponds to the complex pore network, which leads to the increase in the surface area, shape factor, and fractal dimension. At constant porosity, the shape factor is negatively correlated with permeability, and with increasing Euler number, the heterogeneity of the pore structure increases, resulting in an increase of flow resistance and a decrease of permeability. The results provide a new pore morphology characterization method for digital rock and help to understand the flow mechanism of hydrocarbons in complex pore networks.

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Pore-scale modeling of complex transport phenomena in porous media

Cited by 207 publications

References 403 publications

WITHDRAWN: Mathematical modeling of transport phenomena in chemical reactors

WITHDRAWN: Mathematical modeling of transport phenomena in chemical reactors

Droplet evaporation in finite-size systems: Theoretical analysis and mesoscopic modeling

Influence of Pore Morphology on Permeability through Digital Rock Modeling: New Insights from the Euler Number and Shape Factor

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