Готові списки джерел за темами / Capillary and porous materials

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Добірка наукової літератури з теми "Capillary and porous materials"

Автор: Grafiati
Опубліковано: 30 травня 2022
Оновлено: 31 травня 2022

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Статті в журналах з теми "Capillary and porous materials"

1

Sychevskii, V. A. "Drying of colloidal capillary-porous materials." International Journal of Heat and Mass Transfer 85 (June 2015): 740–49. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2015.02.025.

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2

Horikawa, Toshihide, D. D. Do, and D. Nicholson. "Capillary condensation of adsorbates in porous materials." Advances in Colloid and Interface Science 169, no. 1 (November 2011): 40–58. http://dx.doi.org/10.1016/j.cis.2011.08.003.

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3

Tuchinskii, L. I., M. B. Shtern, and S. A. Zakharov. "Sintering kinetics of capillary-porous powder materials." Powder Metallurgy and Metal Ceramics 32, no. 6 (June 1993): 486–90. http://dx.doi.org/10.1007/bf00560725.

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4

Ratanadecho, P., K. Aoki, and M. Akahori. "Influence of Irradiation Time, Particle Sizes, and Initial Moisture Content During Microwave Drying of Multi-Layered Capillary Porous Materials." Journal of Heat Transfer 124, no. 1 (September 10, 2001): 151–61. http://dx.doi.org/10.1115/1.1423951.

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The drying of capillary porous materials by microwave with rectangular waveguide has been investigated numerically and experimentally. Most importantly, it focuses on the investigation of the distributions of electric field, temperature and moisture profiles within the capillary porous materials. The measurements of temperature and moisture distributions within the capillary porous materials provide a good basis for understanding of the microwave drying process. The mathematical model gives qualitatively comparable trends to experimental data. The calculations of electromagnetic fields inside the rectangular waveguide and the capillary porous materials show that the variation of particle sizes and initial moisture content changes the degree of penetration and rate of microwave power absorbed within the sample. Further, the small particle size leads to much higher capillary pressure resulting in a faster drying time.
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5

Snezhkin, Yu F., V. М. Paziuk, and Zh O. Petrova. "Heat pump technologies of low temperature drying of capillary-porous materials spherical shape." Кераміка: наука і життя, no. 3(48) (October 12, 2020): 7–12. http://dx.doi.org/10.26909/csl.3.2020.1.

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Heat pump technologies have become widely used in space heating and air conditioning systems, and the heat pump can be used for low-temperature drying of capillary-porous materials. Recuperative and condensing heat pumps, which allow both drying and cooling of the material, have become the most widespread. The developed condensing heat pump drying unit with a mine chamber implements a low-temperature drying process of spherical capillary-porous materials at a drying agent temperature of 40-50°C with a decrease in material humidity by 11% to a final humidity of 8%. Experimental studies on a heat pump drying unit for drying capillary-porous materials of spherical shape indicated a significant reduction in average energy costs per process up to 3700 - 4100 kJ/kg of evaporated moisture. The increase in energy consumption increases significantly in the second part of the second period, where heat consumption can reach 5000 - 5350 kJ/kg of evaporated moisture. The use of condensing heat pumps for low-temperature drying of capillary-porous materials has shown high energy efficiency compared to existing drying technologies.
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6

Gamayunov, N. I., and S. N. Gamayunov. "Shrinkage and Strength of Capillary-Porous Colloidal Materials." Journal of Engineering Physics and Thermophysics 77, no. 1 (January 2004): 45–52. http://dx.doi.org/10.1023/b:joep.0000020718.82001.6f.

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7

Denesuk, M., G. L. Smith, B. J. J. Zelinski, N. J. Kreidl, and D. R. Uhlmann. "Capillary Penetration of Liquid Droplets into Porous Materials." Journal of Colloid and Interface Science 158, no. 1 (June 1993): 114–20. http://dx.doi.org/10.1006/jcis.1993.1235.

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8

Kostornov, A. G., A. A. Shapoval, and I. V. Shapoval. "Skeletal heat conductivity of porous metal fiber materials." Kosmìčna nauka ì tehnologìâ 27, no. 2 (May 17, 2021): 70–77. http://dx.doi.org/10.15407/knit2021.02.070.

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The influence of a number of physical characteristics and parameters of metallic fiber materials on their thermal conductivity is studied in this work. Such porous materials are intended, among other things, for their effective use in two-phase heat transfer devices (heat pipes). The use of heat pipes in aircraft and space vehicles provides a number of thermophysical advantages. In particular, heat pipes significantly expand the possibilities of air cooling of heat-loaded technical devices. The thermal conductivity of capillary-porous materials-structures, which are important elements of heat pipes, significantly affects the intensity of two-phase heat transfer inside heat pipes. Frame thermal conductivity is equivalent to the thermal conductivity of materials that are conditionally continuous medium. Studies of the influence of structural characteristics of porous materials, such as porosity and parameters (dimensions) of discrete particles-fibers (fractions of the studied materials), were performed using special experimental equipment created at the I.M. Frantsevich Institute for Problems of Materials Science of the National Academy of Sciences of Ukraine (Kyiv). Porous metal structures (coatings) made of copper, nickel, and steel fibers (MPM) were investigated under conditions similar to those for space heat pipes. The porosity values ​​of the prototypes of materials were in the range of 40 to 93%. The research results showed that the following physical characteristics of capillary structures, such as values ​​of thermal conductivity of metallic materials (fiber fractions), the porosity of capillary-porous metal materials (structures), significantly affect the value of thermal conductivity of porous materials. The dimensions of discrete particles-fibers also affect in a certain way the value of the MBM thermal conductivity but to a lesser degree. The results obtained in this work are summarized in the form of empirical dependencies – formulas, providing engineering calculations of the thermal conductivity values ​​of metal fiber materials. The research results are intended for practical application in aviation and spacecraft apparatus engineering. In particular, the presented results are necessary for the development and creation of effective heat pipes with metal fiber capillary structures.
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Sheleg, V. K. "Increasing the efficiency of application of capillary-porous powder materials. I. Parameters of the efficiency of capillary-porous powder materials." Soviet Powder Metallurgy and Metal Ceramics 30, no. 3 (March 1991): 214–16. http://dx.doi.org/10.1007/bf00794909.

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Sheleg, V. K. "Increasing the efficiency of using capillary-porous powder materials. II. Materials with steady capillary flow." Soviet Powder Metallurgy and Metal Ceramics 30, no. 5 (May 1991): 407–11. http://dx.doi.org/10.1007/bf00793669.

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Дисертації з теми "Capillary and porous materials"

1

López, de Ramos Aura Luisa. "Capillary enhanced diffusion of CO2 in porous media /." Access abstract and link to full text, 1993. http://0-wwwlib.umi.com.library.utulsa.edu/dissertations/fullcit/9400131.

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Zou, Yuliang. "Modelling of the dynamic effects in capillary pressure in coupling with deformation on the desiccation of porous materials." Thesis, Ecole centrale de Nantes, 2020. http://www.theses.fr/2020ECDN0034.

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La durabilité des infrastructures constituées de matériaux poreux, tels que le sol, le sable et les matériaux cimentaires, est étroitement liée aux conditions environnementales. La plupart des mécanismes de détérioration sont régis par l'état d'humidité des matériaux poreux. En effet, l'état d'humidité détermine la répartition de la pression capillaire qui est une force importante pour la déformation solide et pourrait augmenter le risque de fissuration. Cependant, la plupart des modèles d'interaction fluide-solide utilisés pour prédire le transport de l'humidité et de la déformation solide ont ignoré le phénomène physique existant, qui est les effets dynamiques sur la pression capillaire. Cette thèse vise à améliorer le modèle d'interaction fluide solide avec la prise en compte de cet effet de capillarité dynamique. Trois modèles dynamiques correspondant à différents types de matériaux poreux ont été développés. Le premier modèle est disponible pour les matériaux poreux à perméabilité relativement élevée, tels que le sable et le sol. Le deuxième modèle est utilisé pour les matériaux à base de ciments matures à faible perméabilité. Le troisième modèle est développé pour les matériaux cimentaires durcissant exposés à des conditions d’humidité relative extrêmement faibles. Chaque modèle dynamique, et le modèle non dynamique correspondant, ont été utilisés pour simuler des expériences de séchage (drainage) documentées pour le sable, la pâte de ciment mature et le béton durcissant, respectivement. En comparant avec des données expérimentales, les simulations numériques montrent que la modélisation avec effets dynamiques donne de meilleurs résultats que la modélisation non dynamique. Toutes les comparaisons et investigations ont renforcé la nécessité de considérer l'effet de la capillarité dynamique pour prédire le transport d'humidité et la déformation solide pour un séchage rapide (drainage) des matériaux poreux
The durability of infrastructure made of porous materials such as soil, sand and cement based materials is closely related to the environmental conditions. Most of the mechanisms of deterioration are governed by moisture state in porous materials. Indeed, the moisture state determines the distribution of capillary pressure which is an important driving force for solid deformation and could increase cracking risk. However, most of fluid-solid interaction models used to predict moisture transport and solid deformation have ignored the existing physical phenomenon dynamic effects on capillary pressure. This thesis aims to refine the fluid-solid interaction model with the consideration of this dynamic capillarity effect. Three dynamic models corresponding to various types of porous materials have been developed. The first model is available for porous materials with relative high permeability such as sand and soil. The second model is used for mature cement-based materials with low permeability. The third model is developed for hardening cement-based materials exposed to extremely low relative humidity condition. Each dynamic model and corresponding non-dynamic model have been implemented to simulate documented drying (drainage) experiments for sand, mature cement paste and hardening concrete, respectively. Compared with experimental data, the numerical simulations show that modeling with dynamic effects gives better results than non dynamic modeling. All comparisons and investigations enhanced the necessity of considering dynamic capillarity effect to predict the moisture transport and solid deformation for fast drying (drainage) of porous materials
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Maurath, Johannes [Verfasser], and N. [Akademischer Betreuer] Willenbacher. "Tailored Formulation of Capillary Suspensions as Precursor for Porous Sintered Materials / Johannes Maurath ; Betreuer: N. Willenbacher." Karlsruhe : KIT-Bibliothek, 2018. http://d-nb.info/1156327830/34.

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4

Törnkvist, Anna. "Aspects of Porous Graphitic Carbon as Packing Material in Capillary Liquid Chromatography." Doctoral thesis, Uppsala University, Analytical Chemistry, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-3306.

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In this thesis, porous graphitic carbon (PGC) has been used as packing material in packed capillary liquid chromatography. The unique chromatographic properties of PGC has been studied in some detail and applied to different analytical challenges using both electrospray ionization-mass spectrometry (ESI-MS) and ultra violet (UV) absorbance detection.

The crucial importance of disengaging the conductive PGC chromatographic separation media from the high voltage mass spectrometric interface has been shown. In the absence of a grounded point between the column and ESI emitter, a current through the column was present, and changed retention behaviors for 3-O-methyl-DOPA and tyrosine were observed. An alteration of the chromatographic properties was also seen when PGC was chemically oxidized with permanganate, possibly due to an oxidation of the few surface groups present on the PGC material.

The dynamic adsorption of the chiral selector lasalocid onto the PGC support resulted in a useful and stable chiral stationary phase. Extraordinary enantioselectivity was observed for 1-(1-naphthyl)ethylamine, and enantioseparation was also achieved for other amines, amino acids, acids and alcohols.

Finally, a new strategy for separation of small biologically active compounds in plasma and brain tissue has been developed. With PGC as stationary phase it was possible to utilize a mobile phase of high content of organic modifier, without the addition of ion-pairing agents, and still selectively separate the analytes.

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Törnkvist, Anna. "Aspects of porous graphitic carbon as packing material in capillary liquid chromatography /." Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-3306.

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Neacsu, Valentin. "Modeling and measurement of micro flow in dual scale porous media." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 280 p, 2010. http://proquest.umi.com/pqdweb?did=1998445961&sid=7&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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Kharaghani, Abdolreza [Verfasser], and Evangelos [Gutachter] Tsotsas. "Drying and wetting of capillary porous materials : insights from imaging and physics-based modeling / Abdolreza Kharaghani ; Gutachter: Evangelos Tsotsas." Magdeburg : Universitätsbibliothek Otto-von-Guericke-Universität, 2020. http://d-nb.info/1220035491/34.

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Xuefeng, Yang. "A network approach to the analysis of mass transfer from a capillary porous medium." reponame:Repositório Institucional da UFSC, 1995. https://repositorio.ufsc.br/xmlui/handle/123456789/157927.

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Tese (doutorado) - Universidade Federal de Santa Catarina, Centro Tecnologico
Made available in DSpace on 2016-01-08T19:37:50Z (GMT). No. of bitstreams: 1 101465.pdf: 9852443 bytes, checksum: b8cafd1383f95b320b58aaf21d5415f0 (MD5) Previous issue date: 1995
Um modelo de secagem microscópico para o meio poroso capilar é apresentado nesta tese. Este modelo microscópico é baseado em uma abordagem de rede para o meio poroso e é usado para estudar o comportamento da secagem no interior de meio poroso durante o processo de secagem em escala dos poros. A força motora para o transporte do líquido é a força capilar e a transferência de massa na fase gasosa é a difusão de vapor. O efeito Kelvin é considerado neste modelo, ou seja, a interface gás-líquido é tratada como um menisco. A força gravitacional é ignorada pois os tamanhos dos poros e gargantas da rede são relativamente grandes (>20mm). O processo de secagem é simulado usando este modelo em várias redes quadradas 100x20, contendo 2000 poros e 4000 gargantas. O líquido é álcool e o processo de secagem é assumido isotérmico.
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9

Thomys, Oliver. "Asymptotic Behaviour of Capillary Problems governed by Disjoining Pressure Potentials." Doctoral thesis, Universitätsbibliothek Leipzig, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:15-20100412-072001-8.

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Jacquard, Catherine. "Etude experimentale d'une barriere capillaire avec un modele de laboratoire." Paris, ENMP, 1988. http://www.theses.fr/1988ENMP0097.

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Книги з теми "Capillary and porous materials"

1

Bruce, Duncan W., Dermot O'Hare, and Richard I. Walton, eds. Porous Materials. Chichester, UK: John Wiley & Sons, Ltd, 2010. http://dx.doi.org/10.1002/9780470711385.

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2

Ishizaki, K., S. Komarneni, and M. Nanko. Porous Materials. Boston, MA: Springer US, 1998. http://dx.doi.org/10.1007/978-1-4615-5811-8.

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Moreno-Piraján, Juan Carlos, Liliana Giraldo-Gutierrez, and Fernando Gómez-Granados, eds. Porous Materials. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-65991-2.

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4

Bettotti, Paolo, ed. Submicron Porous Materials. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-53035-2.

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Smirnov, H. F. Transport phenomena in capillary-porous structures and heat pipes. Boca Raton: Taylor & Francis, 2010.

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Smirnov, H. F. Transport phenomena in capillary-porous structures and heat pipes. Boca Raton: CRC Press, 2010.

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7

Su, Bao-Lian, Clément Sanchez, and Xiao-Yu Yang, eds. Hierarchically Structured Porous Materials. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527639588.

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Kowalski, Stefan Jan, ed. Drying of Porous Materials. Dordrecht: Springer Netherlands, 2007. http://dx.doi.org/10.1007/978-1-4020-5480-8.

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Liu, Zhen. Multiphysics in Porous Materials. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-93028-2.

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10

Electrochemistry of porous materials. Boca Raton: Taylor & Francis, 2010.

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Частини книг з теми "Capillary and porous materials"

1

Ricken, Tim, and Reint de Boer. "Two Phase Flow in Capillary Porous Thermo-Elastic Materials." In IUTAM Symposium on Physicochemical and Electromechanical Interactions in Porous Media, 359–64. Dordrecht: Springer Netherlands, 2005. http://dx.doi.org/10.1007/1-4020-3865-8_42.

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Shymanskyi, Volodymyr, and Yaroslav Sokolovskyy. "Variational Formulation of Viscoelastic Deformation Problem in Capillary-Porous Materials with Fractal Structure." In Advances in Intelligent Systems and Computing, 640–54. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-63270-0_44.

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3

Sokolovskyy, Yaroslav, Oleksiy Sinkevych, Roman Voliansky, and Volodymyr Kryshtapovych. "The Study of Cellular Automata Method When Used in the Problem of Capillary-Porous Material Thermal Conductivity." In Advances in Intelligent Systems and Computing, 714–29. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-63270-0_49.

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4

Klinowski, Jacek. "Porous Materials." In Solid-State NMR Spectroscopy Principles and Applications, 437–82. Oxford, UK: Blackwell Science Ltd, 2007. http://dx.doi.org/10.1002/9780470999394.ch9.

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Kärger, Jörg, Frank Stallmach, Rustem Valiullin, and Sergey Vasenkov. "Porous Materials." In NMR Imaging in Chemical Engineering, 231–50. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2006. http://dx.doi.org/10.1002/3527607560.ch3a.

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Reimert, R., E. H. Hardy, and A. von Garnier. "Porous Materials." In NMR Imaging in Chemical Engineering, 250–62. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2006. http://dx.doi.org/10.1002/3527607560.ch3b.

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Ren, Xiaohong, Siegfried Stapf, and Bernhard Blümich. "Porous Materials." In NMR Imaging in Chemical Engineering, 263–84. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2006. http://dx.doi.org/10.1002/3527607560.ch3c.

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Young, J. J., T. W. Bremner, M. D. A. Thomas, and B. J. Balcom. "Porous Materials." In NMR Imaging in Chemical Engineering, 285–303. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2006. http://dx.doi.org/10.1002/3527607560.ch3d.

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Beyea, S. D., D. O. Kuethe, A. McDowell, A. Caprihan, and S. J. Glass. "Porous Materials." In NMR Imaging in Chemical Engineering, 304–21. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2006. http://dx.doi.org/10.1002/3527607560.ch3e.

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Hirasaki, George J. "Porous Materials." In NMR Imaging in Chemical Engineering, 321–40. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2006. http://dx.doi.org/10.1002/3527607560.ch3f.

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Тези доповідей конференцій з теми "Capillary and porous materials"

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Saini, Rakesh, Matthew Kenny, and Dominik P. J. Barz. "Electroosmotic Flow Through Porous Materials." In ASME 2014 12th International Conference on Nanochannels, Microchannels, and Minichannels collocated with the ASME 2014 4th Joint US-European Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/icnmm2014-21173.

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Electroosmotic flow can be employed in many microfluidic systems. Especially, highly porous materials are suitable since they generate significant flow rates and pressures. In the current research, we employ electroosmosis experiments using a relatively simple and cost-effective set-up including different sets of sintered packed beds of borosilicate micro spheres having a wider range of porosities. Various experiments are performed with varying applied electric field, and packed bed porosity. The flow rates are measured by tracking the air/liquid interface in a capillary which is connected to the packed bed. A mathematical model of the setup reveals the influence of the capillary flow on the flow rate of the electroosmotic flow.
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Khmelev, Vladimir N., Kwang Moon Choo, Andrey V. Shalunov, Hyo-Jai Lee, Andrey N. Lebedev, and Maxim V. Khmelev. "The compact ultrasonic dryer for capillary-porous and loose materials." In 2008 9th International Workshop and Tutorials on Electron Devices and Materials. IEEE, 2008. http://dx.doi.org/10.1109/sibedm.2008.4585910.

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Vala, J., and P. Jarošová. "Identification of the capillary transfer coefficient in porous building materials." In 11TH INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS 2013: ICNAAM 2013. AIP, 2013. http://dx.doi.org/10.1063/1.4825673.

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Shymanskyi, Volodymyr, and Yaroslav Sokolovskyy. "Variational Formulation Of The Stress-Strain Problem In Capillary-Porous Materials With Fractal Structure." In 2020 IEEE 15th International Conference on Computer Sciences and Information Technologies (CSIT). IEEE, 2020. http://dx.doi.org/10.1109/csit49958.2020.9321996.

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Koronthalyova, Olga, and Matus Holubek. "Effect of particular material parameters on wetting process of capillary-porous material." In INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS (ICNAAM 2016). Author(s), 2017. http://dx.doi.org/10.1063/1.4994501.

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Sokolovskyy, Yaroslav, Ihor Kroshnyy, and Volodymyr Yarkun. "Mathematical modeling of visco-elastic-plastic deformation in capillary-porous materials in the drying process." In 2015 Xth International Scientific and Technical Conference "Computer Sciences and Information Technologies" (CSIT). IEEE, 2015. http://dx.doi.org/10.1109/stc-csit.2015.7325429.

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Li, Hongru, Xu Cheng, Yan Chen, Wenjing Du, Baokui Yi, and Gongming Xin. "A COMPUTING METHOD TO MEASURE PORE SIZE IN POROUS MATERIALS BASED ON CAPILLARY PENETRATION OBSERVATION." In International Heat Transfer Conference 16. Connecticut: Begellhouse, 2018. http://dx.doi.org/10.1615/ihtc16.tpm.023797.

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Prosvirnikov, D. B., E. I. Baigildeeva, A. R. Sadrtdinov, and A. A. Fomin. "Modelling heat and mass transfer processes in capillary-porous materials at their grinding by pressure release." In 2017 International Conference on Industrial Engineering, Applications and Manufacturing (ICIEAM). IEEE, 2017. http://dx.doi.org/10.1109/icieam.2017.8076443.

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Belyaev, V. P., L. G. Varepo, P. S. Belyaev, O. A. Belousov, and A. P. Pudovkin. "Choosing non-destructive testing method to determine diffusion coefficient for products from thin capillary-porous materials." In NANOSCIENCE AND NANOTECHNOLOGY: NANO-SciTech. AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5122160.

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Choi, Jeehoon, Byungho Sung, Yunkeun Lee, Yongsoo Jang, Hwankook Kang, and Diana-Andra Borca-Tasciuc. "Experimental Investigation on Boiling Phenomena of Bi-Layer Composite Porous Wicks Textured With Nano-Porous Layer." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-36833.

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Miniature loop heat pipes (mLHP) are envisioned as one of the next generation electronic cooling technologies. They are closed loop, phase-change devices where the working fluid evaporates during heat addition and its flow is maintained by capillary forces developed inside the porous wick lining the evaporator. While they have many advantages such as high heat flux rates and heat rejection far from the heat source, potential problems are often associated with bubble nucleation and boiling incipience in the porous wicks. Bi-layer composite porous wicks consisting of a nano-porous layer textured onto the traditional micro-porous material are thought to possess enhanced capillary wicking, which could benefit mLHP applications. In this context, it is important to also understand their boiling characteristics. Therefore, a boiling heat transfer testing apparatus was developed and used to characterize the boiling incipience of bi-layer porous wicks. These results may guide material selection in the design of mLHP evaporators employing bi-layer porous wicks.
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Звіти організацій з теми "Capillary and porous materials"

1

Snyder, Victor A., Dani Or, Amos Hadas, and S. Assouline. Characterization of Post-Tillage Soil Fragmentation and Rejoining Affecting Soil Pore Space Evolution and Transport Properties. United States Department of Agriculture, April 2002. http://dx.doi.org/10.32747/2002.7580670.bard.

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Tillage modifies soil structure, altering conditions for plant growth and transport processes through the soil. However, the resulting loose structure is unstable and susceptible to collapse due to aggregate fragmentation during wetting and drying cycles, and coalescense of moist aggregates by internal capillary forces and external compactive stresses. Presently, limited understanding of these complex processes often leads to consideration of the soil plow layer as a static porous medium. With the purpose of filling some of this knowledge gap, the objectives of this Project were to: 1) Identify and quantify the major factors causing breakdown of primary soil fragments produced by tillage into smaller secondary fragments; 2) Identify and quantify the. physical processes involved in the coalescence of primary and secondary fragments and surfaces of weakness; 3) Measure temporal changes in pore-size distributions and hydraulic properties of reconstructed aggregate beds as a function of specified initial conditions and wetting/drying events; and 4) Construct a process-based model of post-tillage changes in soil structural and hydraulic properties of the plow layer and validate it against field experiments. A dynamic theory of capillary-driven plastic deformation of adjoining aggregates was developed, where instantaneous rate of change in geometry of aggregates and inter-aggregate pores was related to current geometry of the solid-gas-liquid system and measured soil rheological functions. The theory and supporting data showed that consolidation of aggregate beds is largely an event-driven process, restricted to a fairly narrow range of soil water contents where capillary suction is great enough to generate coalescence but where soil mechanical strength is still low enough to allow plastic deforn1ation of aggregates. The theory was also used to explain effects of transient external loading on compaction of aggregate beds. A stochastic forInalism was developed for modeling soil pore space evolution, based on the Fokker Planck equation (FPE). Analytical solutions for the FPE were developed, with parameters which can be measured empirically or related to the mechanistic aggregate deformation model. Pre-existing results from field experiments were used to illustrate how the FPE formalism can be applied to field data. Fragmentation of soil clods after tillage was observed to be an event-driven (as opposed to continuous) process that occurred only during wetting, and only as clods approached the saturation point. The major mechanism of fragmentation of large aggregates seemed to be differential soil swelling behind the wetting front. Aggregate "explosion" due to air entrapment seemed limited to small aggregates wetted simultaneously over their entire surface. Breakdown of large aggregates from 11 clay soils during successive wetting and drying cycles produced fragment size distributions which differed primarily by a scale factor l (essentially equivalent to the Van Bavel mean weight diameter), so that evolution of fragment size distributions could be modeled in terms of changes in l. For a given number of wetting and drying cycles, l decreased systematically with increasing plasticity index. When air-dry soil clods were slightly weakened by a single wetting event, and then allowed to "age" for six weeks at constant high water content, drop-shatter resistance in aged relative to non-aged clods was found to increase in proportion to plasticity index. This seemed consistent with the rheological model, which predicts faster plastic coalescence around small voids and sharp cracks (with resulting soil strengthening) in soils with low resistance to plastic yield and flow. A new theory of crack growth in "idealized" elastoplastic materials was formulated, with potential application to soil fracture phenomena. The theory was preliminarily (and successfully) tested using carbon steel, a ductile material which closely approximates ideal elastoplastic behavior, and for which the necessary fracture data existed in the literature.
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2

Stubos, A. K., C. Satik, and Y. C. Yortsos. Effects of capillary heterogeneity on vapor-liquid counterflow in porous media. Office of Scientific and Technical Information (OSTI), June 1992. http://dx.doi.org/10.2172/10159907.

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3

Stubos, A. K., C. Satik, and Y. C. Yortsos. Effects of capillary heterogeneity on vapor-liquid counterflow in porous media. Office of Scientific and Technical Information (OSTI), June 1992. http://dx.doi.org/10.2172/5121949.

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4

Bayu Aji, L., I. Winter, T. Fears, and S. Kucheyev. Sculpting Non-Machinable Porous Materials. Office of Scientific and Technical Information (OSTI), September 2020. http://dx.doi.org/10.2172/1668504.

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Xu, Baomin, and Y. C. Yortsos. Capillary effects in drainage in heterogeneous porous media: Continuum modeling, experiments and pore network simulations. Office of Scientific and Technical Information (OSTI), April 1993. http://dx.doi.org/10.2172/10149983.

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Xu, Baomin, and Y. C. Yortsos. Capillary effects in drainage in heterogeneous porous media: Continuum modeling, experiments and pore network simulations. Office of Scientific and Technical Information (OSTI), April 1993. http://dx.doi.org/10.2172/6863814.

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Ho, Hoi Chun, Ngoc A. Nguyen, Kelly M. Meek, Amit K. Naskar, David M. Alonso, Sikander H. Hakim та Jeffrey J. Fornero. γ-Valerolactone-Extracted Lignin to Porous Carbon Materials. Office of Scientific and Technical Information (OSTI), травень 2018. http://dx.doi.org/10.2172/1470859.

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Moon, Chul, Jason E. Heath, and Scott A. Mitchell. Statistical Inference for Porous Materials using Persistent Homology. Office of Scientific and Technical Information (OSTI), December 2017. http://dx.doi.org/10.2172/1414662.

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9

Herbold, E., M. Homel, and R. Managan. On Artificial Viscosity for Shocks in Porous Materials. Office of Scientific and Technical Information (OSTI), September 2017. http://dx.doi.org/10.2172/1404851.

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10

Lee, Matthew Nicholson, Kyle James Cluff, and Matthew Douglass Crall. Advanced Manufacturing of Porous and Composite Silicone Materials. Office of Scientific and Technical Information (OSTI), May 2020. http://dx.doi.org/10.2172/1635503.

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