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Journal articles on the topic 'Micro-Scale Combustion Mechanisms'

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1

Chen, Junjie, Baofang Liu, Xuhui Gao, and Deguang Xu. "Computational Fluid Dynamics Simulations of Lean Premixed Methane-Air Flame in a Micro-Channel Reactor Using Different Chemical Kinetics." International Journal of Chemical Reactor Engineering 14, no. 5 (2016): 1003–15. http://dx.doi.org/10.1515/ijcre-2015-0174.

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Abstract Flame temperature and structure are a useful tool for describing flame dynamics and flame stability, especially at the micro-scale. The objective of this study is to examine the effect of different kinetic models (that have been proven to accurately predict the macro-combustion behavior of hydrocarbons) on the combustion characteristics and the flame stability in microreactors, and to explore the applicability of these kinetic models at the micro-scale. Computational fluid dynamics (CFD) simulations of lean premixed methane-air flame in micro-channel reactors were carried out to exami
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2

Xu, Qianghui, Xiongyu Chen, Junyu Yang, Zhiying Liu, and Lin Shi. "Pore-scale study of coke combustion in a matrix-fracture system based on the micro-continuum approach." Physics of Fluids 34, no. 3 (2022): 036603. http://dx.doi.org/10.1063/5.0082518.

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In situ combustion is an advanced recovery technique used to exploit heavy oil in the fractured reservoirs that make up approximately one-third of global heavy-oil resources. However, the mesoscopic mechanisms of coke combustion in the multiscale matrix-fracture system are not well understood because of the difficulty of performing pore-resolved simulations. In the present study, a pore-resolved micro-continuum approach was used to investigate fully coupled thermal and reactive flows through fractured media that contain nanometer-range coke pores, micrometer-range matrix pores, and sub-millime
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3

Chen, Junjie, Longfei Yan, and Wenya Song. "Numerical simulation of micro-scale catalytic combustion characteristics with detailed chemical kinetic reaction mechanisms of hydrogen/air." Reaction Kinetics, Mechanisms and Catalysis 113, no. 1 (2014): 19–37. http://dx.doi.org/10.1007/s11144-014-0719-x.

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4

Elfasakhany, Ashraf, Mishal Alsehli, Bahaa Saleh, Ayman A. Aly, and Mohamed Bassuoni. "Renewable Pulverized Biomass Fuel for Internal Combustion Engines." Processes 8, no. 4 (2020): 465. http://dx.doi.org/10.3390/pr8040465.

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Biomass is currently one of the world’s major renewable energy sources. Biomass in a powder form has been recently proposed as the most encouraging of biomass contours, especially because it burns like a gas. In the current study, biomass powder was examined, for the first time, as a direct solid fuel in internal combustion engines. The aim of the current study was to investigate modeling tools for simulation of biomass powder in combustion engines (CE). The biomass powder applied was in a micro-scale size with a typical irregular shape; the powder length was in the range of 75−5800 μm, and th
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5

Ghonjizade-Samani, Farnaz, Laia Haurie, Ramón Malet, and Vera Realinho. "The Components’ Roles in Thermal Stability and Flammability of Cork Powder." Materials 16, no. 10 (2023): 3829. http://dx.doi.org/10.3390/ma16103829.

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In this study, an analysis of the influence of extractives, suberin and lignocellulosic components on the pyrolysis decomposition and fire reaction mechanisms of a cork oak powder from Quercus suber L. is presented. The summative chemical composition of cork powder was determined. Suberin was the main component at 40% of the total weight, followed by 24% of lignin, 19% of polysaccharides and 14% of extractives. The absorbance peaks of cork and its individual components were further analyzed by means of ATR-FTIR spectrometry. Thermogravimetric analysis (TGA) showed that the removal of extractiv
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6

Godini, Hamid Reza, Arash Rahimalimamaghani, Seyed Saeid Hosseini, Innokentij Bogatykh, and Fausto Gallucci. "Multiscale Analysis of Membrane-Assisted Integrated Reactors for CO2 Hydrogenation to Dimethyl Ether." Catalysts 13, no. 9 (2023): 1273. http://dx.doi.org/10.3390/catal13091273.

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The conceptual design and engineering of an integrated catalytic reactor requires a thorough understanding of the prevailing mechanisms and phenomena to ensure a safe operation while achieving desirable efficiency and product yields. The necessity and importance of these requirements are demonstrated in this investigation in the case of novel membrane-assisted reactors tailored for CO2 hydrogenation. Firstly, a carbon molecular sieve membrane was developed for simultaneous separation of CO2 from a hot post-combustion CO2-rich stream, followed by directing it along a packed-bed of hybrid CuO-Zn
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Li, Jun, Meilin Zhu, Chang Geng, et al. "A Molecular Understanding of the Flame Retardant Mechanism of Zinc Stannate/Polypropylene Composites via ReaxFF Simulations." Inorganics 11, no. 6 (2023): 233. http://dx.doi.org/10.3390/inorganics11060233.

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As an important new flame retardant, zinc stannate (ZS) shows wide application prospects due to its many advantages. However, the flame retardant mechanism of composites made with polymer combined with ZS is still unclear. In particular, there is a lack of molecular level description of the micro-scale flame retardant mechanism. The combustion mechanism through molecular simulation technology has become an important research paradigm in the field of fire, which can provide new insights for the development of new materials. This work studied the flame retardant mechanism of composites consisten
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8

Kumar, Sudarshan, Kaoru Maruta, and S. Minaev. "Experimental investigations on the combustion behavior of methane–air mixtures in a micro-scale radial combustor configuration." Journal of Micromechanics and Microengineering 17, no. 5 (2007): 900–908. http://dx.doi.org/10.1088/0960-1317/17/5/008.

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9

Hamid, Md Abdul, and Kyle Christopher Smith. "A Bottom-up Transient Theory for Concentration Polarization with Applicability to over-Limiting Current Conditions." ECS Meeting Abstracts MA2023-01, no. 25 (2023): 1669. http://dx.doi.org/10.1149/ma2023-01251669mtgabs.

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Renewable power sources have drawn interest due to scarcity of fossil fuels and associated pollution during their combustion-based power production. Renewables are projected to produce approximately 60% of US electricity generation by 2050, with an expected contribution of 2000 TW-h from wind power alone. To overcome the mismatch between electricity demand and intermittent supply, such power plants require large-scale energy-storage device integrated with them. In contrast to other technologies, redox flow batteries (RFBs) offer independently scalable power and energy capacity that is demanded
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10

Livkiss, Karlis, Blanca Andres, Abhishek Bhargava, and Patrick van Hees. "Characterization of stone wool properties for fire safety engineering calculations." Journal of Fire Sciences 36, no. 3 (2018): 202–23. http://dx.doi.org/10.1177/0734904118761818.

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Prediction of the insulating capability of building products in fire conditions would support the product development process. Stone wool insulation is a widely used material in fire barrier constructions. Due to the combustion of its organic content, the temperature inside stone wool can rise above the temperature of the exposed boundary. This temperature rise is difficult to predict. An extensive test program was performed to obtain the thermal and reaction kinetic properties of stone wool. The test methods included modified slug calorimeter, thermogravimetric analysis, differential scanning
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11

Andres, Blanca, Karlis Livkiss, Juan P. Hidalgo, et al. "Response of stone wool–insulated building barriers under severe heating exposures." Journal of Fire Sciences 36, no. 4 (2018): 315–41. http://dx.doi.org/10.1177/0734904118783942.

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This article presents the experimental results of stone wool–layered sandwich constructions, with either steel or gypsum claddings, tested under four different heating exposures: 7 kW/m2 incident radiant heat flux exposure, 60 kW/m2 incident radiant heat flux exposure, parametric time–temperature curve exposure and ISO 834 standard time–temperature exposure. The test apparatus used were a movable radiant panel system, a mid-scale furnace (1.5 m3) and a large-scale furnace (15 m3). The results show that reduced-scale tests are capable of reproducing the heat transferred through the construction
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12

Khandelwal, Bhupendra, Gur Partap Singh Sahota, and Sudarshan Kumar. "Investigations into the flame stability limits in a backward step micro scale combustor with premixed methane–air mixtures." Journal of Micromechanics and Microengineering 20, no. 9 (2010): 095030. http://dx.doi.org/10.1088/0960-1317/20/9/095030.

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13

Wang, Z. W., B. X. Li, A. Othman, and Z. B. Zhang. "Performance of rice husk ash under different two periods combustion conditions and effect of particle size on the strength of mortar." Materiales de Construcción 73, no. 349 (2023): e305. http://dx.doi.org/10.3989/mc.2023.304422.

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This study aims to investigate the effect of two periods burning conditions on the chemical properties of rice husk ash (RHA). Gray correlation theory analysis combined with a scanning electron microscope was used to precisely analyze the impact of RHA particle sizes on the mechanical properties and microstructure of mortar. The experimental results reveal that prolonging residence time at 600 ºC could significantly reduce the carbon content and boost the silica content in RHA. The potassium content of RHA could be reduced by burning at a low and then high temperature. Additionally, gray corre
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14

Hunt, Emily M., John J. Granier, Keith B. Plantier, and Michelle L. Pantoya. "Nickel aluminum superalloys created by the self-propagating high-temperature synthesis of nanoparticle reactants." Journal of Materials Research 19, no. 10 (2004): 3028–36. http://dx.doi.org/10.1557/jmr.2004.0389.

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Advancements in nanotechnology for material processing via combustion synthesis have spurred the development of superalloys that provide improved protective properties. Nanoscale reactant particles offer unique thermal properties and increased homogeneity that improve the microstructural features and macroscopic properties of the synthesized product. In this study nanoscale molybdenum trioxide (MoO3) particles were added to micron scale nickel (Ni) and aluminum (Al). The goal was to incorporate a nanoscale additive within the reactant matrix that would produce a superalloy by generating excess
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15

Junjie, Chen, and Xu Deguang. "Recent Advances and Challenges in the Catalytic Combustion at Micro-Scales." February 3, 2016. https://doi.org/10.5281/zenodo.1123775.

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The high energy density of hydrocarbon fuels creates a great opportunity to develop catalytic combustion based micro-power generation systems to meet increasing demands for micro-scale devices. In this work, the recent technological development progress in fundamental understanding of the catalytic combustion at micro-scales are reviewed. The underlying fundamental mechanisms, flame stability, hetero-homogeneous interaction, catalytic ignition, and catalytic reforming are reviewed in catalytic micro-scale combustion systems. Catalytic combustion and its design, diagnosis, and modeling operatio
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16

Alexander, N. Lukin. "Universal Concept of Self-Synchronization of the Micro/Nano- Structures of the Energetic Materials Reactionary Zones and Micro-Scale Combustion Mechanisms." February 24, 2016. https://doi.org/10.19070/2470-4415-1600011.

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Presented research is devoted to further development of ideas of famous Russian scientist Ya.B. Zeldovich in the new area of physics - the physics of self-organizing systems in the active medium. According our hypothesis the macro-scale phenomena at the energetic materials combustion is result of self - synchronization of the micro/nano - structures of the reactionary zones. Motivated excitation source of the micro/nano - physical structures in the reactionary zones are the micro/nano - structures of the electro-magnetic fields. Our hypothesis is supported by the recent data, obtained in the m
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17

Junjie, Chen. "Homogeneous Combustion Characteristics and Flame Stabilization in Small Channels." J. of Advancement in Engineering and Technology Voume2, Issue2 (2014). https://doi.org/10.5281/zenodo.890188.

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The push toward the miniaturization of electromechanical devices and the resulting need for micro-power generation systems with low-weight, long-life devices has led to the recent development of the field of micro-combustion. The concept behind this new field is that since batteries have low specific energy and liquid hydrocarbon fuels have a very high specific energy, a miniaturized power-generating device, even with a relatively inefficient conversion of hydrocarbon fuels to power, would result in increased lifetime and/or reduced weight of an electronic or mechanical system that currently r
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18

Behrouzinia, P., R. A. Irani, and M.H. Saidi. "One-Dimensional Numerical Investigation of a Cylindrical Micro-Combustor Applying Electrohydrodynamics Effect." International Journal of Mechanical, Industrial and Aerospace Sciences 5.0, no. 7 (2012). https://doi.org/10.5281/zenodo.1328988.

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In this paper, a one-dimensional numerical approach is used to study the effect of applying electrohydrodynamics on the temperature and species mass fraction profiles along the microcombustor. Premixed mixture is H2-Air with a multi-step chemistry (9 species and 19 reactions). In the micro-scale combustion because of the increasing ratio of area-to-volume, thermal and radical quenching mechanisms are important. Also, there is a significant heat loss from the combustor walls. By inserting a number of electrodes into micro-combustor and applying high voltage to them corona discharge occurs. This
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19

Junjie, Chen. "Effect of wall thermal conductivity on the heterogeneous combustion of hydrogen-air mixtures over platinum in catalytic micro-combustors." J. of Advancement in Engineering and Technology Volume 4, Issue 1 (2016). https://doi.org/10.5281/zenodo.890924.

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The hetero-/homogeneous combustion of hydrogen-air mixtures over platinum in catalytic micro-combustors were investigated numerically and experimentally. Experiments were performed in a catalytic channel-flow micro-reactor. Catalysts consisting of platinum supported on alumina powder were prepared and tested. Numerical simulations were carried out with a two-dimensional computational fluid dynamics model in conjunction with detailed heterogeneous and homogeneous reaction mechanisms. Specific objectives are to study the effects of combustor wall conductivity on heterogeneous combustion characte
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20

Lukin, Alexander N. "Universal Concept of Self-Synchronization of the Micro/Nano- Structures of the Energetic Materials Reactionary Zones and Micro-Scale Combustion Mechanisms." International Journal of Aeronautical Science & Aerospace Research, February 24, 2016, 91–96. http://dx.doi.org/10.19070/2470-4415-1600011.

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21

Zhang, Yu, Wenjie Su, Yifan Qin, et al. "All-fiber probing of aluminized RDX particle micro-explosion." Frontiers in Physics 11 (January 26, 2023). http://dx.doi.org/10.3389/fphy.2023.1123818.

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Investigating the thermal decomposition characteristics and mechanisms of nano- and submicron-aluminized 1,3,5-trinitro-1,3,5-triazine (RDX) is essential to optimize the formulations and improve combustion/detonation efficiencies. However, no research has focused on the microscopic scale of a single aluminized RDX particle. We demonstrate an all-fiber probing method for the violent thermal decomposition of a single nano-aluminized micron-RDX particle, which we address as micro-explosion in this paper. We believe studying micro-explosion will be beneficial to the research of thermal decompositi
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22

Chen, Junjie, Longfei Yan та Wenya Song. "EFFECT OF WALL THERMAL CONDUCTIVITY ON MICRO-SCALE COMBUSTION CHARACTERISTICS OF HYDROGEN-AIR MIXTURES WITH DETAILED CHEMICAL KINETIC MECHANISMS IN Pt/γ-Al2O3 CATALYTIC MICRO-COMBUSTORS". Frontiers in Heat and Mass Transfer 5 (29 листопада 2014). http://dx.doi.org/10.5098/hmt.5.16.

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23

Paepe, Ward De, Massimiliano Renzi, Marina Montero Carrerro, Carlo Caligiuri, and Francesco Contino. "Micro Gas Turbine Cycle Humidification for Increased Flexibility: Numerical and Experimental Validation of Different Steam Injection Models." Journal of Engineering for Gas Turbines and Power 141, no. 2 (2018). http://dx.doi.org/10.1115/1.4040859.

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With the current shift from centralized to more decentralized power production, new opportunities arise for small-scale combined heat and power (CHP) production units like micro gas turbines (mGTs). However, to fully embrace these opportunities, the current mGT technology has to become more flexible in terms of operation—decoupling the heat and power production in CHP mode—and in terms of fuel utilization—showing flexibility in the operation with different lower heating value (LHV) fuels. Cycle humidification, e.g., by performing steam injection, is a possible route to handle these problems. C
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24

Shen, Zhen, Ao Shen, Pujie Yue, et al. "Experimental study on coal-fired flue gas HCl removal by injecting adsorbent into flue duct." International Journal of Chemical Reactor Engineering, May 15, 2023. http://dx.doi.org/10.1515/ijcre-2022-0232.

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Abstract Adsorbent injection into flue ducts is an effective technology for controlling gaseous pollutant in coal-fired power plants. This study proposed a new technique of injecting dechlorinater into flue duct for HCl removal in order to realize the wet flue gas desulfurization (WFGD) wastewater sequestration and upgrade the gypsum quality, known as the source dechlorination method. Four alkaline-based adsorbents of CaO, Ca(OH)2 + 5 % NaOH, ethanol-modified CaO, and NaHCO3 were developed and investigated in a pilot scale 6 kW coal-fired circulating fluidized bed (CFB) combustion system for c
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25

Junjie, Chen. "Catalytic Combustion and Self-ignition Characteristics of lean Hydrogen-air mixtures in Pt/γ-Al2O3 Micro-Combustors using detailed Chemical Reaction Mechanism". J. of Physical and Chemical Sciences Volume 3, Issue 3 (2015). https://doi.org/10.5281/zenodo.1000221.

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Catalytic combustion and self-ignition characteristics of lean hydrogen-air mixtures in micro-combustors with Pt/γ-Al2O3-coated walls were investigated numerically using elementary heterogeneous (catalytic) and homogeneous (gas-phase) chemical reaction schemes and detailed transport. Simulations indicate that the large thermal inertia of the micro-combustor solid structure leads to slow temperature dynamics, and transient response is dominated by the thermal inertia. The time required to reach steady state decreases with increasing inlet velocity and decreasing wall thermal conductivity. The h
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26

Wang, Lulu, Xinchao Liu, Susie Wu, et al. "Greenhouse gas emissions from livestock production tripled those from household consumption in the Eurasian desert steppe." Ecological Processes 14, no. 1 (2025). https://doi.org/10.1186/s13717-025-00627-8.

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Abstract Background Family ranches are major sources of livestock-related greenhouse gas (GHG) emissions in global pastoral ecosystems. We conducted semi-structured interviews and collected data on livestock production and the livelihoods of 235 family ranches in a desert steppe of Inner Mongolia where intensive pastoral management is practiced. A cradle-to-farmgate life cycle assessment (LCA) was performed with functional units standardized as 1 kg live weight (LW) for beef cattle and meat sheep breeds. Structural equation modeling (SEM) was employed to elucidate the socioeconomic forcing mec
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27

Dejima, Kazuhito, Osamu Nakabeppu, Julien Moussou, and Guillaume Pilla. "Application of a MEMS heat flux sensor to heat transfer research on an impinging diesel jet." International Journal of Engine Research, January 25, 2021, 146808742098844. http://dx.doi.org/10.1177/1468087420988448.

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To clarify the mechanisms of heat transfer on an engine wall is an important challenge because the heat loss on the wall is one of the dominant factors that limit the thermal efficiency. A thin-film resistance type heat flux sensor fabricated with Micro-Electro-Mechanical Systems (MEMS) technologies was applied to research on the heat transfer of an impinging diesel jet. The MEMS sensor had a high sensitivity and multiple measurement points with a scale comparable to the turbulence of in-cylinder flow for the investigation of local instantaneous heat transfer characteristics in engines. Measur
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28

Sanata, Andi, Imam Sholahuddin, Ahmad Adib Rosyadi, et al. "Characterization of Biogas as an Alternative Fuel in Micro-Scale Combustion Technology." International Journal of Integrated Engineering 15, no. 4 (2023). http://dx.doi.org/10.30880/ijie.2023.15.04.006.

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This study observes the flame characteristics of the biogas in micro/meso-scale (MSC) combustion technology, namely in a cylindrical MSC. For comparison, the fuel and combustor variations were carried out with backward-facing step size (bfs) as the flame holder in the combustor.The bfs are varied by changing the combustor's length of the inlet diameter. However, the size of the outlet diameter of the combustor is always constant to obtain a continuous combustion reaction zone. Biogas/methane (CH4), butane gas (C4H10), and a mixture of biogas-butane are used as fuel, with air as the oxidizing a
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Fang, Linbo, and Shengqiang Yang. "Micro-Mechanism of Nitrogen Inhibition of Spontaneous Coal Combustion: A Multi-Scale Study Based on Radical Modulation and Functional Group Reorganization." Combustion Science and Technology, May 24, 2025, 1–15. https://doi.org/10.1080/00102202.2025.2510578.

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30

Shao, Shujing, Hao Lu, Zhaowen Wang, and Xiaobei Cheng. "A grid-independent dispersion approach for large-eddy simulation of spray." Physics of Fluids 36, no. 2 (2024). http://dx.doi.org/10.1063/5.0184228.

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This study proposes a subgrid-scale (SGS) dispersion approach for large-eddy simulation (LES) of spray. Rather than associating the turbulence correlation timescale used in the dispersion approach with the computational grid, we put forward an approximation of this timescale proportional to the Kolmogorov timescale. The Kolmogorov scale kinetic energy is added to the variance of the stochastic part of the SGS dispersion velocity to account for the effects of micro-scale flows on droplets. The proposed approach supports the notion of grid-independent LES and is illustrated for two benchmark Eng
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31

Tranter, T. J., A. S. Aloy, N. V. Sapozhnikova, D. A. Knecht, and T. A. Todd. "Porous Crystalline Silica (Gubka) as a Inorganic Support Matrix for Novel Sorbents." MRS Proceedings 713 (2002). http://dx.doi.org/10.1557/proc-713-jj11.68.

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ABSTRACTInorganic ion exchange media typically exist as fine powders, making large-scale use impractical, unless the media can be affixed to an appropriate matrix. Likewise, organic chelating agents are typically dissolved in a solvent and absorbed into porous matrices for use in extraction chromatography. The most common matrices utilized in both cases are organic materials, that are not compatible with high radiation fields or acceptable as final waste forms. Recent investigations have shown that ion exchange sorbents can be effectively loaded within a porous crystalline silica (Gubka) matri
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