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Journal articles on the topic 'Porosity Reduction Model'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Gal, Doron, Jack Dvorkin, and Amos Nur. "A physical model for porosity reduction in sandstones." GEOPHYSICS 63, no. 2 (1998): 454–59. http://dx.doi.org/10.1190/1.1444346.

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The experimental elastic moduli‐porosity trends for clean sandstones can be described by the modified upper Hashin‐Shtrikman (MUHS) bound. One geometrical (but not necessarily geological) realization is: as porosity decreases, the number of the pores stays the same and each pore shrinks while maintaining its shape. This concept of uniform porosity reduction implies that permeability is proportional to the effective porosity squared, and that formation factor is proportional to the inverse of the effective porosity. The effective porosity here refers to the part of the pore‐space that dominates

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2

Yang, Jiakun, Zhou Qiu, and Chuanfeng Zheng. "Noise Reduction Effect of Porous Asphalt Pavement Based on Acoustic-Structure Coupling Model." Environmental and Earth Sciences Research Journal 8, no. 2 (2021): 97–102. http://dx.doi.org/10.18280/eesrj.080206.

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Nowadays, the traffic noise problem is becoming increasingly prominent. In order to study the influence of porosity and pore depth on the noise reduction performance of asphalt pavement, this paper used the software COMSOL Multiphysics to establish acoustic-structure coupling models, and simulated the sound absorption and noise reduction effect of asphalt pavement under 10%, 15%, 20%, 25%, and 30% porosity; moreover, under the condition of unchanged asphalt pavement porosity, the sound absorption and noise reduction effect of asphalt pavement under 3cm, 4cm, 5cm, 6cm, and 7cm pore depth was st

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3

Stepanov, S., A. Grigorev, M. Vasilyeva, D. Nikiforov, and D. Spiridonov. "Multiscale model reduction of fluid flow based on the dual porosity model." Journal of Physics: Conference Series 1158 (February 2019): 042025. http://dx.doi.org/10.1088/1742-6596/1158/4/042025.

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4

Meng, Xiang Tao, Wang Lin Li, Xi Wang, and Xiao Yan Wei. "Study of Numerical Modeling for Reduction Rate of Porosity of Sand under Equal Amplitude Cyclic Loading." Applied Mechanics and Materials 353-356 (August 2013): 2652–57. http://dx.doi.org/10.4028/www.scientific.net/amm.353-356.2652.

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According to the geological conditions and operating regimes of Wang river groundwater reservoir of Laizhou in Shandong, through doing sandy one-dimensional equal amplitude circulating compression test, the effect of groundwater level repeated rising or falling on volumes of groundwater reservoir is simulated, the character of porosity changing regulation with circulating period is analyzed, the relation between reduction rate of porosity and circulating period is summarized, and the hyperbolic model of reduction rate of porosity and circulating period is constructed initially, the concept of

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5

Ren, Ting Zhi, Xue Liang Shi, Xin Jin, and Pei Pei Han. "Study on Prediction of Reduction Position Based on Solidification and Heat Transfer Model." Applied Mechanics and Materials 487 (January 2014): 540–43. http://dx.doi.org/10.4028/www.scientific.net/amm.487.540.

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As one of the important parameters of dynamic soft reduction technology, reduction position seriously affects the using effect of this technology to decrease center segregation and porosity of continuous casting slabs. According to the actual production conditions, a two-dimensional solidification and heat transfer model was established. In order to obtain more accurate model, the heat transfer coefficient was amending by the pin shooting technique in measuring shell thickness. The laws of the effect of casting speed, superheat degree and specific water flow on reduction position were analyzed

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Rahbari, R. G., N. H. Abu Kasim, A. A. Madfa, M. Hamdi, and M. Bayat. "Porosity reduction model in titanium–hydroxyapatite FGM composites using shrinkage measurement." Materials Research Innovations 15, sup2 (2011): s110—s113. http://dx.doi.org/10.1179/143307511x13031890748281.

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7

Lee, Yun, Seung-Jun Kwon, and Ki-Tae Park. "Simplified Carbonation Model Considering Ca(OH)2 Solubility and Porosity Reduction." Journal of the Korea institute for structural maintenance and inspection 19, no. 1 (2015): 128–38. http://dx.doi.org/10.11112/jksmi.2015.19.1.128.

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8

Canals, Martin, and Jean Dominique Meunier. "A model for porosity reduction in quartzite reservoirs by quartz cementation." Geochimica et Cosmochimica Acta 59, no. 4 (1995): 699–709. http://dx.doi.org/10.1016/0016-7037(94)00355-p.

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9

Senin, A. V. "Carbon in Solidphase Reduction of Oxides." Materials Science Forum 870 (September 2016): 578–83. http://dx.doi.org/10.4028/www.scientific.net/msf.870.578.

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The gasphase-solidphase model is used to explain the results of solid chromite ore carbothermic reduction. The reducing agent is carbon atoms. Carbon is brought to the surface of chromite grains by gaseous carbon-containing molecules and radicals, such as C3O2, CH4, CH3, CH2, CH, C2H2 and other carbon containing particles. Gas particles penetrate a piece of ore through the pores and cracks. Active carbon atoms C are formed by the dissociation of gaseous particles. Reduction by carbon is carried out on the chromite grain surface due to the cations and anions diffusion in the oxide lattice towar

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10

Liu, Yang, Jianhua Liu, and Yang He. "Evolution Behavior and Closure Mechanism of Porosity in Large Billet during the Reduction Pretreatment." Metals 12, no. 4 (2022): 599. http://dx.doi.org/10.3390/met12040599.

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The reduction pretreatment process was proposed to be applied to large billets for the purpose of alleviating the center porosities and reducing the rolling ratio. This study focused on the evolution behavior and closure mechanism of porosity in a large billet during reduction pretreatment. The porosities were characterized by ultrasonic scanning and 3D reconstruction. The results showed that the porosities near the surface of the billet were firstly closed during the reduction pretreatment. The reduction began to effectively act on the center of the billet at the deformation of 0.16. When the

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11

Smith, James Edward, and Edward Millard Smith-Rowland. "Proposed Model for Shale Compaction Kinetics." Geosciences 11, no. 3 (2021): 137. http://dx.doi.org/10.3390/geosciences11030137.

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Shales are the most abundant class of sedimentary rocks, distinguished by being very fine-grained, clayey, and compressible. Their physical and chemical properties are important in widely different enterprises such as civil engineering, ceramics, and petroleum exploration. One characteristic, which is studied here, is a systematic reduction of porosity with depth of burial. This is due increases in grain-to-grain stress and temperature. Vertical stress in sediments is given by the overburden less the pore fluid pressure, σ, divided by the fraction of the horizontal area which is the supporting

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12

Shen, Zihan, Xiaoyu Wang, and Xiaofeng Sun. "Noise reduction by perforated cascades in annular ducts." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 265, no. 5 (2023): 2124–35. http://dx.doi.org/10.3397/in_2022_0304.

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One of the latest trends in noise control relating to aeroacoustics is to mimic the silent flight capability of owls. Particularly, porosity is most often applied on cascades in ducts with axial flows, such as stator structures in an aero-engine. However, current acoustic scattering models of perforated cascades are based on two-dimensional methods without including the three-dimensional effects. In this paper, we present a fully three-dimensional acoustic scattering model for perforated cascades based on the lifting surface theory in which the dominant sound source reduces to dipoles alone un

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13

An, Xiu Wei, Jing Song Wang, Xue Feng She, Yin Gui Ding, and Qing Guo Xue. "Numerical Simulation for Direct Reduction of Pure Zinc Oxide Pellet Containing Carbon." Advanced Materials Research 194-196 (February 2011): 56–60. http://dx.doi.org/10.4028/www.scientific.net/amr.194-196.56.

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Based on the equations of mass conservation, energy conservation and chemical reaction rates, a mathematical model of direct reduction for pure zinc oxide pellet containing carbon was built. On the basis of verifying the accuracy of the model by comparing calculated values with experimental results, the effects of furnace temperature, porosity and radius of pellet on the reduction were investigated. The calculated results revealed that the furnace temperature and the radius of pellet have significant effect while porosity has only a little. Thus it can be inferred that the rate-determining ste

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14

Kerl, Hans U., Hanne Boll, Teresa Fiebig, et al. "Implantation of Pipeline Flow-Diverting Stents Reduces Aneurysm Inflow Without Relevantly Affecting Static Intra-aneurysmal Pressure." Neurosurgery 74, no. 3 (2013): 321–34. http://dx.doi.org/10.1227/neu.0000000000000253.

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Abstract BACKGROUND: Flow-diverting stent (FDS) implantation is an endovascular treatment option for intracranial aneurysms. However, little is known about the hemodynamic effects. OBJECTIVE: To assess the effect of stent compression on FDS porosity, to evaluate the influence of single and overlapping implantation of FDS on intra-aneurysmal flow profiles, and to correlate stent porosity with changes in static mean intra-aneurysmal pressure. METHODS: Intra-aneurysmal time-density curves were recorded in a pulsatile in vitro flow model before and after implantation of FDSs (Pipeline Embolization

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15

Duan, Zhen Ya, Ying Ying Dong, Fu Lin Zheng, and Jun Mei Zhang. "Numerical Simulation and Experimental Verification of Butterfly Porous Fences." Key Engineering Materials 501 (January 2012): 413–17. http://dx.doi.org/10.4028/www.scientific.net/kem.501.413.

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In this paper, the domestic and foreign research progress of numerical simulation on the porous fence is introduced briefly, and a numerical model is established to simulate the flow characteristics behind the butterfly porous fence through the FLUENT software. The comparison results found good agreement between the numerical model and wind tunnel experimental data with an error of 7.8% in the wind reduction ratio, indicating the present numerical model can be used to undertake study on butterfly and non-planar porous fences. The effect of porosity on the flow characteristics behind the butter

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16

Zhang, Jin, Nan Guo Jin, Ye Tian, and Xian Yu Jin. "A New Method for Predicting Compressive Strength of Cement-Based Materials." Advanced Materials Research 788 (September 2013): 502–7. http://dx.doi.org/10.4028/www.scientific.net/amr.788.502.

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As a porous medium, the strength of cement-based materials is significantly affected by its porosity. This paper presents a new method to describe the strength development of cement-based materials as a function of porosity based on a developed microstructure hydration model of cement. The hydration model deduces the relationship between the diameter change of cement particle and time based on Krstulović-Dabić hydration kinetics formulas and extends a broader version by considering the effect of water reduction, temperature variation, interfacial contact area between hydration products and f

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17

Wu, Dan, Binshan Ju, Shiqiang Wu, Eric Thompson Brantson, Yingkun Fu, and Zhao Lei. "Investigation of productivity decline in inter-salt argillaceous dolomite reservoir due to formation damage and threshold pressure gradient: Laboratory, mathematical modeling and application." Energy Exploration & Exploitation 35, no. 1 (2016): 33–53. http://dx.doi.org/10.1177/0144598716684308.

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The inter-salt argillaceous dolomite reservoirs in the central region of China contain large abundance of oil resources with ultra-low permeability and porosity. However, the oil wells in this area show a very quick reduction with the decline of formation pressure. This article aims to investigate the main possible reasons that affect oil well productivity in the target oilfield. This study begins with analysis of capillary microscopic model, core stress sensitivity experiments, and non-Darcy percolation experiments. The impact of effective stress on permeability and porosity of the reservoir

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18

Wangen, Magnus. "A simple model of pressure build-up caused by porosity reduction during burial." Geophysical Journal International 130, no. 3 (1997): 757–64. http://dx.doi.org/10.1111/j.1365-246x.1997.tb01870.x.

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19

Bjorkum, P. A., and P. H. Nadeau. "TEMPERATURE CONTROLLED POROSITY/PERMEABILITY REDUCTION, FLUID MIGRATION, AND PETROLEUM EXPLORATION IN SEDIMENTARY BASINS." APPEA Journal 38, no. 1 (1998): 453. http://dx.doi.org/10.1071/aj97022.

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Findings mainly from the Norwegian Continental Shelf indicate that at temperatures greater than approximately 60°C, internally sourced quartz cementation and diagenetic clay become important porosity and permeability reduction factors, respectively. Porosity loss due to quartz cementation in sandstones and siltstones proceeds mainly independent of effective stress or fluid pressure. Porosity loss rates approach those required to generate high fluid overpressures at approximately 120°C, which can result in hydrofracturing of the overlying low permeability shales. In thick low permeable sediment

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20

Liu, Yu, Miaomiao Li, Peifeng Su, Biao Ma, and Zhanping You. "Porosity Prediction of Granular Materials through Discrete Element Method and Back Propagation Neural Network Algorithm." Applied Sciences 10, no. 5 (2020): 1693. http://dx.doi.org/10.3390/app10051693.

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Granular materials are used directly or as the primary ingredients of the mixtures in industrial manufacturing, agricultural production and civil engineering. It has been a challenging task to compute the porosity of a granular material which contains a wide range of particle sizes or shapes. Against this background, this paper presents a newly developed method for the porosity prediction of granular materials through Discrete Element Modeling (DEM) and the Back Propagation Neural Network algorithm (BPNN). In DEM, ball elements were used to simulate particles in granular materials. According t

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21

Meshram, Amogh, Joe Govro, Ronald J. OMalley, Seetharaman Sridhar, and Yuri Korobeinikov. "Modeling Isothermal Reduction of Iron Ore Pellet Using Finite Element Analysis Method: Experiments & Validation." Metals 12, no. 12 (2022): 2026. http://dx.doi.org/10.3390/met12122026.

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Iron ore pellet reduction experiments were performed with pure hydrogen (H2) and mixtures with carbon monoxide (CO) at different ratios. For direct reduction processes that switch dynamically between reformed natural gas and hydrogen as the reductant, it is important to understand the effects of the transition on the oxide reduction kinetics to optimize the residence time of iron ore pellets in a shaft reactor. Hence, the reduction rates were studied by varying experimental parameters such as the temperature (800, 850 & 900 °C), reactant gas flow rate (100, 150 & 200 cm3/min), pellet s

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22

Benslimane, Malika, Saâdia Benmamar, and André Paquier. "Two-Dimensional Shallow-Water Model with Porosity for Urban Flood Modeling." Proceedings 2, no. 20 (2018): 1307. http://dx.doi.org/10.3390/proceedings2201307.

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In the world, floods are at the forefront of natural hazard. Urban areas are often at risk of flooding and just as often unprepared for management. Flood modeling is nowadays a very important topic in the theme of water, it inevitably involves the numerical resolution of the shallow water equations derived from the Navier Stocks equations governing flows. Two-dimensional shallow water models with porosity appear as an interesting path for the large-scale modeling of floodplains with urbanized areas. The porosity accounts for the reduction in storage and in the exchange sections due to the pres

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23

Frollini, Eleonora, and Marco Petitta. "Free LNAPL Volume Estimation by Pancake Model and Vertical Equilibrium Model: Comparison of Results, Limitations, and Critical Points." Geofluids 2018 (2018): 1–13. http://dx.doi.org/10.1155/2018/8234167.

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Light nonaqueous phase liquids (LNAPLs), due to their low solubility, dissolve slowly, acting as a long-term source of water contamination, and consequently they represent an important environmental issue. In the subsoil, more than 99% of spilled LNAPL remains as adsorbed and free phase; therefore, the volume estimation of free phase, obtained in this case through two different conceptual models (Pancake Model and Vertical Equilibrium Model), is considered a fundamental step for a correct site remediation. According to the first model, the LNAPL floating on the water table and its saturation i

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24

Qi, Hongliang, Tiangang Yuan, Fei Zhao, Guishan Chen, Weiping Tian, and Jiachun Li. "Local Scour Reduction around Cylindrical Piers Using Permeable Collars in Clear Water." Water 15, no. 5 (2023): 897. http://dx.doi.org/10.3390/w15050897.

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To address the shortcomings of the solid collar, mainly the potential risk of deformation and damage due to its weight after overhanging above the river bed caused by local scour, a lighter form of a local scour reduction measure, the permeable collar, was proposed. The aim was to reduce the local scour depth around cylindrical piers, and a total of 20 tests were conducted in this study. First, the influence of the porosity of the permeable collar on the local scour reduction efficiency was studied under the condition of the constant size of the installation height, the diameter, and the thick

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Shatsov, A. A., I. V. Ryaposov, and D. M. Larinin. "Model of Fracture, Friction, and Wear Phenomena of Porous Iron." Advances in Tribology 2011 (2011): 1–16. http://dx.doi.org/10.1155/2011/810254.

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Mechanical and tribotechnical features of powdered materials are strongly influenced by pore volume, fracture character, impurities, alloying, concentration inhomogeneity, friction conditions, and other factors. Pores also have influence on acceleration of diffusion processes and reduce undercooled austenite resistance. Annealed in hydrogen, ultra pure iron powder was used to study porous iron features. Toughness fracture and tribotechnical features had nonmonotonic dependence from porosity different from all known dependences got from technical iron powders. Researches brought out the fact th

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You, Jang Youl, Ki Pyo You, Sun Young Paek, and Young Moon Kim. "A Study on the Effect of Wind Fences in Reducing Wind Velocity at Fruit Farms." Advanced Materials Research 919-921 (April 2014): 1667–73. http://dx.doi.org/10.4028/www.scientific.net/amr.919-921.1667.

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Fruit growers install wind fences to prevent fruits from dropping. To examine the effect of wind fences in reducing wind velocity, this study conducted a performance experiment, a farmhouse model experiment, and analyzed how wind fences reduce wind velocity. Among the four types of wind fence with porosities ranging between 30% and 60%, the one with a porosity of 40% showed the highest performance. Findings from the reduced model experiment that used a wind tunnel showed that wind fences with a porosity of over 50% had a wind velocity reduction effect. In addition, the experiment found that th

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Tursunbaev, Sarvar, Nodir Turakhodjaev, Shirinkhon Turakhujaeva, Shakhrizoda Ozodova, Shohruh Hudoykulov, and Azizakhon Turakhujaeva. "Reduction of gas porosity when alloying A000 grade aluminum with lithium fluoride." IOP Conference Series: Earth and Environmental Science 1076, no. 1 (2022): 012076. http://dx.doi.org/10.1088/1755-1315/1076/1/012076.

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Abstract Currently, aluminum alloys are widely used in various industries, such as aerospace, mechanical engineering, food processing and others. The article presents the reduction of volume emissions of harmful gases in the process of alloying A000 grade technical aluminum alloy made of pure aluminum with a combination of lithium fluoride. In experiments, lithium fluorine was incorporated into technical aluminum in the groove structure in 3 different masses. Bund’s experiments were carried out in 2 different ways in a closed and open environment, outside the furnace, samples were taken. In bo

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Knyazeva, Anna G., and Yuri P. Sharkeev. "Temperature Calculation for Laser Sintering of Titanium and Niobium Taking into Account Properties Change due to Powder Layer Shrinkage." Key Engineering Materials 712 (September 2016): 220–25. http://dx.doi.org/10.4028/www.scientific.net/kem.712.220.

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The model of laser sintering with regard to explicit porosity evolution of powder layer has been suggested. Due to porosity reduction the shrinkage occurs, thermal - physical properties (the heat capacity, thermal conductivity coefficient) and reflection coefficient of laser irradiation change. It has been shown that additional mechanism of convective heat transfer connects with powder layer thickness evolution. It was detected that model obeys some prognostic properties and allows to reveal the area of technological parameters where homogeneous properties of sintered layer form.

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Ru, Yu, Chenming Hu, Xuyang Chen, et al. "Droplet Penetration Model Based on Canopy Porosity for Spraying Applications." Agriculture 13, no. 2 (2023): 339. http://dx.doi.org/10.3390/agriculture13020339.

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Analysing the penetration and droplet deposition characteristics in the canopy of fruit trees is critical for optimising the operational parameters of air-assisted spraying equipment, achieving precise application of chemicals, and improving the effectiveness of fruit tree pest and disease control. We used a mobile LIDAR system to detect the tree canopy characteristics and optical porosity and conduct wind tunnel experiments to investigate the interaction between the tree canopy, the airflow field, and the droplet penetration ratio in the canopy of fruit trees. The results show that the relati

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Knudsen, James K., and Kenneth E. Palmquist. "The Effect of Porosity on the Head-Media Interface." Journal of Tribology 123, no. 3 (2000): 555–60. http://dx.doi.org/10.1115/1.1308036.

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A lubrication model for the head-media interface is presented which includes the effect of porosity in the media coating. Experimental data is shown which illustrates the reduction in head-media spacing as porosity is increased. A modified Reynolds equation is derived to account for the effects of coating porosity. Other authors have considered a very thin porous layer to simulate a liquid lubricant or surface microstructure on a nonporous substrate. This study considers a porous layer that can be much larger than the bearing clearance. Darcy’s law is used in the porous layer. Velocity-slip ef

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Andrieux, Florence, Dong Zhi Sun, and Andreas Burblies. "Multiscale Approach for the Damage Modeling of an Aluminum Casting Alloy with Stochastic Character." Materials Science Forum 877 (November 2016): 680–85. http://dx.doi.org/10.4028/www.scientific.net/msf.877.680.

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Aluminum die casting components are widely used in vehicle constructions because they satisfy the conflicting requirements between weight reduction and mechanical property improvement. However, the analysis of deformation and damage behavior of aluminum cast components is very complex, since local mechanical properties in the components are inhomogeneous as a consequence of spatial distribution of microstructure. For crash simulation it is necessary to well predict the damage behavior which is strongly influenced by micro-defects especially by cast pores. The conventional continuum mechanics a

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Wu, Chenhui, Cheng Ji, and Miaoyong Zhu. "Deformation Behavior of Internal Porosity in Continuous Casting Wide-Thick Slab during Heavy Reduction." Metals 9, no. 2 (2019): 128. http://dx.doi.org/10.3390/met9020128.

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Heavy reduction (HR) is a novel technology that could effectively improve the internal porosities and other internal quality problems in continuously cast steel, during which a large reduction deformation is implemented at and after the strand solidification end. In the present paper, non-uniform solidification of the wide-thick slab was calculated with a two-dimensional (2D) heat transfer model. Based on the predicted temperature distribution at the solidification end of the casting strand, a three-dimensional (3D) thermal-mechanical coupled model was developed for investigating the deformati

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Wangen, Magnus, Jan Sagen, Tor Bjørnstad, Harald Johansen, and Alban Souche. "Models for Calcium Carbonate Precipitation in the Near-Well Zone by Degassing of CO2." Open Petroleum Engineering Journal 9, no. 1 (2016): 178–94. http://dx.doi.org/10.2174/1874834101609160178.

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Calcium carbonate scale formation is a well known problem for water producing wells. Although there are several types of scale forming processes, we investigate the case of calcium carbonate precipitation when the degassing of CO2 causes the calcium equilibrium concentration to decrease towards a production well. We study a simplified system of carbonate chemistry, which allows for analytical expressions for the porosity loss as a function of time. The precipitation process normally goes from flow-limited away from the well to precipitation-limited close to the well. We derive an expression th

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Rabehi, Mostefa, Billel Rebai, Mustapha Meradjah, and Malek Hadji. "Parametric investigations on dynamic responses of porous functionally graded al/al2o3 plates: effects of homogenization models and material distributions." STUDIES IN ENGINEERING AND EXACT SCIENCES 5, no. 2 (2024): e9051. http://dx.doi.org/10.54021/seesv5n2-323.

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This study presents a numerical analysis of the dynamic responses exhibited by functionally graded Al/Al2O3 plates that incorporate porosity. It explores the influence of critical parameters such as the thickness-to-span ratio and the porosity coefficient on the non-dimensional fundamental frequencies. Various micromechanical homogenization models, including Voigt, Mori-Tanaka, LRVE, Tamura, and Reuss, are utilized in conjunction with different material volume fraction distribution profiles: Power-law, Viola-Tornabene four-parameter, and Trigonometric. The research considers four distinct poro

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Marmolejo-Saucedo, Jose Antonio, Igor Litvinchev, Aitber Bizhanov, Georgiy Yaskov, and Tetyana Romanova. "Estimating Porosity of Agglomerated Products Using Optimized Sphere Packing." International Journal of Manufacturing, Materials, and Mechanical Engineering 13, no. 1 (2024): 1–19. http://dx.doi.org/10.4018/ijmmme.344425.

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The article presents the results of studying the dynamics of changes in the porosity of two-component briquettes and pellets depending on the size of particles and the proportions of components in the mixture using an optimized packing of spheres. Knowing the patterns of change in the porosity allows to optimize the strength of the briquette and pellets as well as to improve their behavior in the reduction processes in blast furnaces, steel making furnaces and in direct reduction reactors. A computation experiment based on heuristic simulation model was designed to study the change of the esti

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Wang, Shaojun, and Faruk Civan. "Model-Assisted Analysis of Simultaneous Paraffin and Asphaltene Deposition in Laboratory Core Tests." Journal of Energy Resources Technology 127, no. 4 (2005): 318–22. http://dx.doi.org/10.1115/1.1924466.

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A model for analysis and interpretation of the simultaneous deposition of paraffin and asphaltene in laboratory core tests is presented. This model incorporates the mass balance equations for the oil, gas, paraffin, and asphaltene pseudocomponents; the paraffin and asphaltene solubility and deposition models; the energy and momentum balance equations; and the porosity and permeability reduction models. This model is numerically solved and validated with two sets of laboratory experimental data. It is demonstrated that the present model satisfactorily represents the simultaneous deposition of p

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Ackermann, S., M. Takacs, J. Scheffe, and A. Steinfeld. "Reticulated porous ceria undergoing thermochemical reduction with high-flux irradiation." International Journal of Heat and Mass Transfer 107 (November 25, 2016): 439–49. https://doi.org/10.1016/j.ijheatmasstransfer.2016.11.032.

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A numerical and experimental analysis is performed on the solar-driven thermochemical reduction of ceria as part of a H<sub>2</sub>O/CO<sub>2</sub>-splitting redox cycle. A transient heat and mass transfer model is developed to simulate reticulated porous ceramic (RPC) foam-type structures, made of ceria, exposed to concentrated solar radiation. The RPC features dual-scale porosity in the mm-range and μm-range within its struts for enhanced transport. The numerical model solves the volume-averaged conservation equations for the porous fluid and solid domains using the effective transport pr

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Alcantara, Arisleidy Mesa, Nadia Mokni, Enrique Romero, and Sebastià Olivella. "Modelling of oedometer tests on pellet-powder bentonite mixtures to support mock-up test analysis." E3S Web of Conferences 195 (2020): 04004. http://dx.doi.org/10.1051/e3sconf/202019504004.

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Bentonite mixtures of MX-80 (80% of high-density pellets and 20% of bentonite powder on a mass basis) have been recently proposed as a candidate material for sealing deep geological disposals of high-level radioactive waste. A loading/unloading oedometer test at constant water content has been performed on this mixture, which has been modelled using the finite element Code_Bright. The constitutive model used to represent the mechanical response is the Barcelona Expansive Model (BExM), since a multi-modal pore size distribution characterises the pore network of the mixture. During compression a

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Wang, Hao, Xiaoxing Yang, Guogang Yang, et al. "Impact of Gas Diffusion Layer Compression on Electrochemical Performance in Proton Exchange Membrane Fuel Cells: A Three-Dimensional Lattice Boltzmann Pore-Scale Analysis." Nanomaterials 14, no. 24 (2024): 2012. https://doi.org/10.3390/nano14242012.

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Proton exchange membrane fuel cells (PEMFCs) are being pursued for applications in the maritime industry to meet stringent ship emissions regulations. Further basic research is needed to improve the performance of PEMFCs in marine environments. Assembly stress compresses the gas diffusion layer (GDL) beneath the ribs, significantly altering its pore structure and internal transport properties. Accurate evaluation of the PEMFC cathode’s electrochemical performance at the pore scale is critical. This study employs a three-dimensional multicomponent gas transport and electrochemical reaction latt

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Schutjens, P. M. T. M., T. H. Hanssen, M. H. H. Hettema, et al. "Compaction-Induced Porosity/Permeability Reduction in Sandstone Reservoirs: Data and Model for Elasticity-Dominated Deformation." SPE Reservoir Evaluation & Engineering 7, no. 03 (2004): 202–16. http://dx.doi.org/10.2118/88441-pa.

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V. A. Salina. ""MODELING OF A CONTINUOUSLY CAST BILLET CENTRAL POROSITY REDUCING PROCESSES"." Science and Technology of Kazakhstan, no. 4.2022 (December 27, 2022): 59–67. http://dx.doi.org/10.48081/qfdl7381.

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"The results of studies aimed at solving the actual problem of improving the quality of continuously cast billets are presented. Technical solutions have been developed to improve the crystallization process by means of pulsating metal blowing with an inert gas in the mold and shear reduction of the billet in the secondary cooling zone of a continuous casting machine (CCM). Physical modeling of shear reduction of continuously cast billets in the secondary cooling zone of CCM on model ingots has been carried out. The resulting macrostructures of model ingots were studied, indicating the absence

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Gase, Andrew C., John H. Bradford, and Brittany D. Brand. "Estimation of porosity and water saturation in dual-porosity pyroclastic deposits from joint analysis of compression, shear, and electromagnetic velocities." GEOPHYSICS 83, no. 3 (2018): ID1—ID11. http://dx.doi.org/10.1190/geo2017-0234.1.

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In situ measurements of porosity and water saturation of pyroclastic deposits have the potential to improve interpretations of geology and hydrology in volcanic regions, and to provide more accurate estimates of dense rock equivalent for volcanic eruptions. However, rock-property models must consider the dual-porosity structure of pyroclastic deposits (i.e., vesicles within pumices and intergranular pores). Vesicularity, intergranular porosity, and water saturation all affect the density, elasticity, and dielectric properties of pyroclastic materials, which control seismic and electromagnetic

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Zhang, Enlai, Liang Hou, Huikun Cai, Chao Shen, and Yaxiang Zhang. "Research on Thermal-Field and Sound-Field Coupling Properties of Different Grid Forms." Shock and Vibration 2016 (2016): 1–10. http://dx.doi.org/10.1155/2016/2741748.

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The inlet grid and exhaust grid are widely used in engineering machinery products. The process that airflow goes through grids is a complex turbulent flow and directly related to the heat dispersion and aerodynamic noise. The theoretical analysis result shows that the jet noise generated by airflow has a connection with the grid structure form, fluid flowing situation, and heat conduction. In addition, the influences of different grid structure forms (included the round hole, long hole, and square hole) and porosity on the heat dissipation and aerodynamic noise were analyzed and presented base

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Vernik, Lev. "Predicting porosity from acoustic velocities in siliciclastics: A new look." GEOPHYSICS 62, no. 1 (1997): 118–28. http://dx.doi.org/10.1190/1.1444111.

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Two principally different mechanisms of porosity reduction‐induced elastic stiffening of siliciclastic rocks are recognized, which, in the domain of grain‐supported siliciclastics with less than 15% volume clay, result in two linear trends with different slopes in the acoustic velocity‐porosity plane. Transition between the two mechanisms occurs at about 30% porosity and roughly coincides with the transition from (1) early diagenesis, characterized by mechanical compaction and initial intergranular bonding, to (2) advanced chemical diagenesis caused by pressure solution and cementation. Peculi

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Li, Fei, Zhiyi Yu, Yonggang Wang, Meixin Ju, Feng Liu, and Zhixian Gui. "Seismic Porosity Prediction in Tight Carbonate Reservoirs Based on a Spatiotemporal Neural Network." Processes 13, no. 3 (2025): 788. https://doi.org/10.3390/pr13030788.

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Porosity prediction from seismic data is of significance in reservoir property assessment, reservoir architecture delineation, and reservoir model building. However, it is still challenging to use traditional model-driven methodology to characterize carbonate reservoirs because of the highly nonlinear mapping relationship between porosity and elastic properties. To address this issue, this study proposes an advanced spatiotemporal deep learning neural network for porosity prediction, which uses the convolutional neural network (CNN) structure to extract spatial characteristics and the bidirect

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Yu, Kyung Wan, Byung In Choi, and Kun Sang Lee. "Assessment of NPV Uncertainty on Heterogeneous Reservoirs during Polymer Flood." Applied Mechanics and Materials 448-453 (October 2013): 4033–37. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.4033.

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This study shows net present value (NPV) distribution by considering uncertainties in porosity, oil viscosity, water saturation, and permeability for polymer flood with Monte Carlo simulation. For high and low average permeability conditions, differences of NPV between polymer flooding and water flooding have been investigated. According to results both average NPV and range of NPV distribution tend to increase with porosity and permeability in all cases. Although water saturation and oil viscosity affect NPV, they are not important parameters that conclude uncertainty of NPV under the conditi

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Nusskern, Philipp, Jürgen Hoffmeister, and Volker Schulze. "Austenite-Bainite Transformation Kinetic Model for the Powder-Metallurgical Steel Astaloy 85 Mo." Materials Science Forum 706-709 (January 2012): 1485–90. http://dx.doi.org/10.4028/www.scientific.net/msf.706-709.1485.

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A new approach for case hardening of powder metallurgical steels is surface densification prior to heat treatment, hence avoiding hardening to the core caused by open porosity. With regard to this process chain a porosity and carbon dependent model of the transformation kinetics is essential. In powder metallurgical materials the transformation behavior is mainly influenced by the chemical composition, homogeneity and porosity. Using a prealloyed powder, e.g. Astaloy 85 Mo, a homogeneous distribution of alloying elements after sintering can be assumed and the transformation behaviour is mainly

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Meyer, Rena, Peter Engesgaard, Klaus Hinsby, Jan A. Piotrowski, and Torben O. Sonnenborg. "Estimation of effective porosity in large-scale groundwater models by combining particle tracking, auto-calibration and <sup>14</sup>C dating." Hydrology and Earth System Sciences 22, no. 9 (2018): 4843–65. http://dx.doi.org/10.5194/hess-22-4843-2018.

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Abstract. Effective porosity plays an important role in contaminant management. However, the effective porosity is often assumed to be constant in space and hence heterogeneity is either neglected or simplified in transport model calibration. Based on a calibrated highly parametrized flow model, a three-dimensional advective transport model (MODPATH) of a 1300 km2 coastal area of southern Denmark and northern Germany is presented. A detailed voxel model represents the highly heterogeneous geological composition of the area. Inverse modelling of advective transport is used to estimate the effec

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Teruna, Christopher, Leandro Rego, Damiano Casalino, Daniele Ragni, and Francesco Avallone. "A Numerical Study on Aircraft Noise Mitigation Using Porous Stator Concepts." Aerospace 9, no. 2 (2022): 70. http://dx.doi.org/10.3390/aerospace9020070.

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This manuscript presents the application of a recently developed noise reduction technology, constituted by poro-serrated stator blades on a full-scale aircraft model, in order to reduce rotor-stator interaction noise in the fan stage. This study was carried out using the commercial lattice Boltzmann solver 3DS-SIMULIA PowerFLOW. The simulation combines the airframe of the NASA High-Lift Common Research Model with an upscaled fan stage of the source diagnostic test rig. The poro-serrations on the stator blades have been modeled based on a metal foam with two different porosity values. The resu

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Sun, Xin, Koji Shiono, Xiao Ying Fu, Ke Jun Yang, and Ting Lin Huang. "Application of Shiono and Knight Method to Compound Open Channel Flow with One-Line Emergent Vegetation." Advanced Materials Research 663 (February 2013): 930–35. http://dx.doi.org/10.4028/www.scientific.net/amr.663.930.

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A quasi two-dimensional model was developed to calculate depth-averaged velocity and bed shear stress in a straight compound channel with one-line emergent vegetated at the floodplain edge. Reduction in volume of water due to vegetation is modelled as porosity. Drag force due to vegetation is modelled as an additional momentum source term in the Navier-Stokes equation. Estimation methods for model parameters—friction factor, roughness height due to drag force, porosity, eddy viscosity and advection term-are discussed. The predictive capability of the model is assessed against experimental data

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