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Relevant bibliographies by topics / Permeable surfaces

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Academic literature on the topic 'Permeable surfaces'

Author: Grafiati

Published: 25 June 2021

Last updated: 9 February 2022

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Journal articles on the topic "Permeable surfaces"

1

Leontiev, Alexander I. "BOUNDARY LAYERS ON PERMEABLE SURFACES." International Journal of Fluid Mechanics Research 27, no. 5-6 (2000): 548–74. http://dx.doi.org/10.1615/interjfluidmechres.v27.i5-6.290.

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Ling, Bowen, Alexandre M. Tartakovsky, and Ilenia Battiato. "Dispersion controlled by permeable surfaces: surface properties and scaling." Journal of Fluid Mechanics 801 (July 19, 2016): 13–42. http://dx.doi.org/10.1017/jfm.2016.431.

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Permeable and porous surfaces are common in natural and engineered systems. Flow and transport above such surfaces are significantly affected by the surface properties, e.g. matrix porosity and permeability. However, the relationship between such properties and macroscopic solute transport is largely unknown. In this work, we focus on mass transport in a two-dimensional channel with permeable porous walls under fully developed laminar flow conditions. By means of perturbation theory and asymptotic analysis, we derive the set of upscaled equations describing mass transport in the coupled channel–porous-matrix system and an analytical expression relating the dispersion coefficient with the properties of the surface, namely porosity and permeability. Our analysis shows that their impact on the dispersion coefficient strongly depends on the magnitude of the Péclet number, i.e. on the interplay between diffusive and advective mass transport. Additionally, we demonstrate different scaling behaviours of the dispersion coefficient for thin or thick porous matrices. Our analysis shows the possibility of controlling the dispersion coefficient, i.e. transverse mixing, by either active (i.e. changing the operating conditions) or passive mechanisms (i.e. controlling matrix effective properties) for a given Péclet number. By elucidating the impact of matrix porosity and permeability on solute transport, our upscaled model lays the foundation for the improved understanding, control and design of microporous coatings with targeted macroscopic transport features.

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Shevelev, Yu D., and F. A. Maksimov. "Modeling a Flow around Permeable Surfaces." Mathematical Models and Computer Simulations 11, no. 4 (July 2019): 531–41. http://dx.doi.org/10.1134/s2070048219040124.

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Hokenson, G. J. "Boundary Conditions for Flow Over Permeable Surfaces." Journal of Fluids Engineering 107, no. 3 (September 1, 1985): 430–32. http://dx.doi.org/10.1115/1.3242505.

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Starke, P., P. Göbel, and W. G. Coldewey. "Urban evaporation rates for water-permeable pavements." Water Science and Technology 62, no. 5 (September 1, 2010): 1161–69. http://dx.doi.org/10.2166/wst.2010.390.

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In urban areas the natural water balance is disturbed. Infiltration and evaporation are reduced, resulting in a high surface runoff and a typical city climate, which can lead to floods and damages. Water-permeable pavements have a high infiltration rate that reduces surface runoff by increasing the groundwater recharge. The high water retention capacity of the street body of up to 51 l/m2 and its connection via pores to the surface lead to higher evaporation rates than impermeable surfaces. A comparison of these two kinds of pavements shows a 16% increase in evaporation levels of water-permeable pavements. Furthermore, the evaporation from impermeable pavements is linked directly to rain events due to fast-drying surfaces. Water-permeable pavements show a more evenly distributed evaporation after a rain event. Cooling effects by evaporative heat loss can improve the city climate even several days after rain events. On a large scale use, uncomfortable weather like sultriness or dry heat can be prevented and the urban water balance can be attenuated towards the natural.

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Gillies, J. A., C. McKenna Neuman, and P. O’Brien. "Flow around surface-mounted permeable cubes on solid and deformable surfaces." Environmental Fluid Mechanics 21, no. 3 (April 11, 2021): 619–41. http://dx.doi.org/10.1007/s10652-021-09789-3.

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Moon, Young J., Ikhyun Bai, and Seungtae Hwang. "Control of edge-scattering noise via permeable surfaces." Journal of the Acoustical Society of America 131, no. 4 (April 2012): 3430. http://dx.doi.org/10.1121/1.4708866.

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Cipolla, Sara Simona, Marco Maglionico, and Irena Stojkov. "Experimental Infiltration Tests on Existing Permeable Pavement Surfaces." CLEAN - Soil, Air, Water 44, no. 1 (December 7, 2015): 89–95. http://dx.doi.org/10.1002/clen.201400550.

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Pierce, F., D. Perahia, and G. S. Grest. "Spreading of liquid droplets on permeable polymeric surfaces." EPL (Europhysics Letters) 86, no. 6 (June 1, 2009): 64004. http://dx.doi.org/10.1209/0295-5075/86/64004.

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Pratt, C. J., J. D. G. Mantle, and P. A. Schofield. "UK research into the performance of permeable pavement, reservoir structures in controlling stormwater discharge quantity and quality." Water Science and Technology 32, no. 1 (July 1, 1995): 63–69. http://dx.doi.org/10.2166/wst.1995.0016.

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The paper reports on a field study on a permeable, reservoir pavement constructed in 1986 at Nottingham, UK; surfaced with permeable, concrete block paving; and with a different sub-base stone-type in each of four reservoirs, from which the discharges were monitored for quantity and water quality. Hydrological relationships involving rainfall, outflow, outflow duration and antecedent conditions are presented. Water quality parameters are shown to be stable in value after some six months, by which time surface contaminants on the sub-base stone had been washed out of the construction. As outflow volume is reduced and water quality parameters (SS and Pb) are low in value, pollutant outflow loadings are significantly lower than with traditional, impermeable surfaces.

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Dissertations / Theses on the topic "Permeable surfaces"

1

Moore, Angela Mary. "Anion reactions at iron surfaces : implications for perchlorate remediation using permeable reactive barriers /." For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2003. http://uclibs.org/PID/11984.

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Shah, Sarvang D. "Heat Transfer in a Nanofluid Flow Past a Permeable Continuous Moving Surface." Cleveland State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=csu1294789859.

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Lai, Peter. "Pore-scale heterogeneity in the mineral distribution and reactive surface area of permeable rocks." Thesis, Imperial College London, 2016. http://hdl.handle.net/10044/1/42537.

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This work was carried out within the Qatar Carbonates and Carbon Storage Research Centre to improve the characterisation of carbonate reservoirs. 3D images obtained using X-ray micro-tomography were used to characterise heterogeneity in surface area in one sandstone and five carbonate rocks. Surface area measured from X-ray imagery were 1 to 2 orders of magnitude lower than nitrogen BET measurements. Roughness factor, i.e. the ratio of BET surface area to X-ray based surface area, was correlated to the presence of clay or microporosity. Comparing statistical distributions of surface area to those in published modelling studies showed that the common practice of leaving surface area and pore volume uncorrelated in a pore led to unrealistic combinations of surface area and pore volume. In Berea sandstone, constraining ratios of surface area to pore volume to a range of values between that of quartz-lined and five times that of clay-lined spheres appeared sufficient. Statistical analysis suggest that at 600 micrometre, the observations do not yet form a representative elementary volume. The development of dual-energy CT for phase identification is presented. Kaolinite, plagioclase, biotite, quartz, orthoclase, albite, dolomite, calcite, pyrite, magnetite, and hematite were scanned. The pairs: plagioclase-orthoclase, albite-quartz, biotite-orthoclase, and hematite-magnetite were not distinguished. Discrimination was possible for all other combinations. In Berea sandstone, kaolinite-smectite, quartz-albite, alkali feldspar-plagioclase, and pyrite-rutile were identified separately. Dual-energy CT has better contrast or capacity for larger samples than single-energy CT. Finally, an adsorption isotherm was measured from batch experiments with quartz and aqueous caesium chloride. 0.755 M of caesium remained in solution while 0.995 mole of caesium was adsorbed per square metre of quartz. Adsorption was expected to increase average attenuation seven-fold and contribute to 86% of the average attenuation in the image. CT images were collected of an equivalent column experiment with quartz powder and aqueous caesium chloride. However, adsorbed caesium was measured to contribute less than 1% of the average attenuation. This work has provided new capabilities to characterise pore-scale mineral and surface area heterogeneity and improve our understanding of CO2 storage in carbonates.

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GHIMIRE, BIDUR. "HYDRAULIC ANALYSIS OF FREE-SURFACE FLOWS INTO HIGHLY PERMEABLE POROUS MEDIA AND ITS APPLICATIONS." 京都大学 (Kyoto University), 2009. http://hdl.handle.net/2433/85382.

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In this study, a comprehensive approach including mathematical, numerical and experimental study has been taken in order to develop new models for describing free surface flow behavior in porous media. The study suggested that modeling free-surface flow in porous media is possible using a single equation capable of showing proper transition between inertial and classical Darcian flow, based on the similarity distribution functions of depth and velocity. The developed integral model inherits both the flow regimes as depicted in the analysis. For both laminar and turbulent flows through porous media, the integral models give satisfactory results. Also the proposed algorithm for numerical simulation is capable of solving various problems of free-surface flow through porous media. This study adds a new dimension to fluid flow in porous media by replacing Darcy's equation with new models that are capable of representing both Darcy and non-Darcy flow behaviors. These are new nonlinear ordinary differential equations inherited both the flow regimes investigated. Integral formulations for unsteady depth distribution, velocity and front speed under constant water level and constant flux discharge inlet conditions have been developed based on similarity law. The formulations presented provide additional analytical insight about the intrusion dynamics. It is pointed out that, based on the self-similarity analysis, the temporal intrusion processes can be categorized into the inertia-pressure (IP) and the pressure-drag (PD) regimes. The early inertia-pressure regime is followed by the pressure-drag regime. In addition, the integral models proposed can be successfully used for the solution of a host of other nonlinear problems that admit self-similarity. The analytical and numerical solutions for constant inlet water level condition are verified with experimental observations. The unsteady distributions of flow depth, inflow velocity and front speeds are compared for various porous media characterized by its corresponding porosity and permeability. Analyses indicate that the integral models clearly represent the nonlinear flow behavior in porous media both in laminar and turbulent flow conditions. The integral model results are in agreement with those obtained by similarity solution for the temporal change of velocity, depth at inlet and front positions. The thesis also presents a computational fluid dynamics (CFD) model developed for the analysis of unsteady free-surface flows through porous media. Vertical two-dimensional numerical simulations are carried out for the free-surface flow inside the porous media governed by a set of Navier-Stokes equations extended for porous media flow. This model includes the convective and local inertia terms along with viscous diffusion term and resistance term comprising Darcy's linear resistance and Forchheimer's inertial resistance terms. The Finite volume method is applied using constrained interpolated propagation (CIP) method and highly simplified marker and cell (HSMAC) type pressure solver for the numerical solution. The evolution of moving free surface is governed by volume of fluid (VOF) method, adapted for the flow through porous media. To prevent the spurious oscillation and generate diffusion-free sharp interface, a third order monotone upstream-centered schemes for conservation laws (MUSCL) type total variation diminishing (TVD) schemes is used to solve the VOF convection equation. The power law derivation and validation for the general flux inflow condition are made for a channel having a backward facing step. The result of theoretical analysis is compared with that of the numerical simulation and it shows a good agreement. The model can be a tool for the proposition of some empirical flow relationships using multivariate correlation. In the case of rapid vertical infiltration of water through a vertical column filled with porous media, a number of experiments and analytical investigations are carried out to see the effect of acceleration in the intrusion process. It is concluded that the conventional infiltration models like Green-Ampts infiltration model cannot account for the acceleration effect in the case of high velocity flow. It is revealed that it takes certain time for intruding water to be accelerated to its peak velocity before decreasing to almost constant velocity. The investigations are made for two different cases: constant water level and variable water level above the porous media. For porous media having low permeability, the effect of acceleration was not so significant. In the case of dam break flow over horizontal porous strata, the model is applied to a complicated domain regarding both geometry and flow boundary conditions. Single set of governing equation is implemented to simulate the complex phenomenon. The model shows its capability in simulating the flow where interface between pressurized and open channel flow moves forward. The vertical acceleration has a significant effect on the rapid vertical infiltration which the shallow water equations cannot account for. In particular, it is shown that vertical two dimensional numerical solution that couples the fluid and solid systems simultaneously at macroscopic scale are feasible and extremely beneficial, shedding a new light into the phenomena unavailable otherwise. It is also found that the proposed numerical model can be used for the determination of storm water storage in porous sub-base in a typical road section. The capability of the model is assessed by using the unsteady inflow condition so as to simulate the condition during high precipitation. The model could be a promising tool for planners and decision makers for effective drainage calculations to mitigate urban flood. The model successfully simulates the free surface flow in the bulk fluid as well as in the porous region. The velocities and stresses are assumed to be continuous at the interface of free and porous media so that a single set of governing equations could be solved. The robustness of the model is demonstrated by the capability of the numerical approach proposed in this thesis.
Kyoto University (京都大学)
0048
新制・課程博士
博士(工学)
甲第14916号
工博第3143号
新制||工||1471(附属図書館)
27354
UT51-2009-M830
京都大学大学院工学研究科都市社会工学専攻
(主査)教授細田尚, 教授戸田圭一, 准教授岸田潔
学位規則第4条第1項該当

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Dracic, Melisa. "Omvandla Malmö till en "svampstad"? : En studie om sponge city-konceptet." Thesis, Malmö universitet, Institutionen för Urbana Studier (US), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-44104.

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Förekomsten av vattenrelaterade problem som extrem nederbörd, översvämningar, torka och vattenbrist kommer att öka i urbana områden till följd av de globala klimatförändringarna. Sponge city-konceptet är ett urbant dagvattenhanteringssystem som lanserades i Kina och syftar till att förbättra vattenhanteringen i städer genom att återställa stadens kapacitet att absorbera, infiltrera, lagra och rena vatten. Den här studien syftade till att undersöka om sponge city-konceptet hade kunnat implementeras i Malmö genom att besvara frågeställningen ” Vilka möjligheter respektive hinder finns det för Malmö att implementera sponge city-konceptet?”. Genom en systematisk litteraturstudie och innehållsanalys i kombination med det teoretiska ramverket som baserades på konceptet sårbarhet för klimatförändringar visade resultatet på att det både finns en del möjligheter men också hinder. Det huvudsakliga hindret som identifierades är att en stor del av marken i Malmö består av täta moränleror vilket utgör ett hinder för de infiltrationsåtgärder som ingår i sponge city-konceptet. Några möjligheter som identifierades är att sponge city-konceptet kan minska känsligheten för skada som uppstår i förhållande till exponeringsnivån, samt att Malmös anpassningskapacitet är relativt hög. På grund av att den här studien enbart undersökte specifika fysiska/miljömässiga aspekter inom sponge city-konceptet krävs däremot fler studier som tar hänsyn till fler aspekter om en implementering av konceptet skulle bli aktuell.
The occurrence of water related problems such as extreme precipitation, floods, drought and water scarcity will increase in urban areas as a result of global climate change. The sponge city-concept is an urban stormwater system launched in China and aims to improve the water management in cities by restoring the city’s capacity to absorb, infiltrate, store and purify water. This study aimed to investigate if the sponge city-concept could be implemented in Malmö by answering the question “What possibilities and obstacles exist for Malmö to implement the sponge city-concept?”. Through a systematic literature review and content analysis in combination with the theoretical framework, which was based on the concept climate change vulnerability, the results showed that there are some possibilities but also obstacles. The main obstacle that was identified is that the ground in Malmö largely consists of dense moraines which forms an obstacle for the infiltration measures that are included in the sponge city-concept. Some possibilities that were identified is that the sponge city-concept can decrease the sensitivity to harm that occurs in relation to the exposure level but also that Malmö’s adaptation capacity is relatively high. However, because this study only investigated specific physical/environmental aspects within the sponge city-concept, more studies that consider more aspects are required if an implementation of the concept would become prevailing.

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Mukherjee, Moumita. "Instrumented permeable blankets for estimating subsurface hydraulic conductivity and confirming numerical models used for subsurface liquid injection." Diss., Connect to online resource - MSU authorized users, 2008.

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Pluvinage, Franck. "Effets d’interfaces poroélastiques sur la stabilité d’un écoulement incompressible cisaillé." Thesis, Orléans, 2015. http://www.theses.fr/2015ORLE2036/document.

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L’objectif de ce travail est d’étendre l’étude locale de la stabilité linéaire des interactions fluide-structure à des domaines peu ou pas encore abordés dans la littérature ; l’influence des interfaces poroélastiques sur les couches limites bidimensionnelles, tridimensionnelles, ou aspirées, ainsi que l’écoulement dans une canopée modélisé par un profil de vitesse réaliste, sont ainsi traités. Les résultats révèlent que dans les couches limites 3D, la compliance réduit le domaine d’instabilité du mode TS dominant mais fait apparaître des modes hydroélastiques ; à l’inverse, la perméabilité stabilise ces derniers tout en déstabilisant l’onde TS, s’apparentant en cela à un amortissement. Sur les ailes en flèche, la transition dépend localement d’instabilités nommées tourbillons Crossflow (CF) d’origine non-visqueuse ; l’effet déstabilisant de la perméabilité sur celles-ci est presque nul tandis que son action positive sur les modes hydroélastiques reste intact, offrant des perspectives prometteuses. Dans le domaine des couches limites aspirées, la quasi-totalité des études publiées reposent sur l’hypothèse d’une perméabilité négligeable et d’une paroi rigide ; or il est démontré ici que la perméabilité (indissociable de la succion) exerce même à faible dose une déstabilisation sur la perturbation dominante et que la compliance (pouvant résulter d’un allègement) provoque l’apparition d’une instabilité absolue. Pour finir, l’attention est portée sur les écoulements dans une canopée -assimilables à des couches de mélange. La stabilité linéaire de l’onde nommée monami ou honami est étudiée sur la base d’un profil de vitesse moyenne réaliste calculé numériquement, puis comparé aux résultats obtenus avec le profil en lignes brisées usuellement employé. L’effet de la force de traînée, communément considéré comme amortissant, se révèle au contraire déstabilisant lorsqu’il est pris en compte dès le calcul du profil de vitesse moyenne
Local linear stability of fluid-structure interactions is investigated in uncustomary fields such as swept, unswept and asymptotic suction incompressible boundary layers developing over compliant, porous plates –in the limit of small permeability– or relatistically-modeled incompressible flows over a canopy. Results show that compliance has a stabilizing effect on the 3D most instable hydrodynamic mode but allows hydroelastic modes to emerge, which take the form of travelling wave flutter instabilities ; conversely, permeability tends to damp the latter ones but to destabilize the former ones. Transition on swept wings also locally depends on 3D unviscid instabilities called Crossflow vortices, hardly unstabilized by permeability ; this provides promizing outlets, since permeability has still a strong positive effect on 3D hydroelastic modes. In the field of incompressible parallel boundary layer flows with uniform suction through the wall, most of the existing studies are based on the assumption that plate’s porosity and flexibility are negligible. Nevertheless, proof is given here that permeability (linked to suction) exerts a strong destabilizing effect on the Tollmien-Schlichting most instable mode. Besides, compliance (that can result from lightering measures) reveals to provoke an absolute instability that is likely to contaminate the entire domain. Finally, attention is paid to incompressible flows across a canopy, that are similar to mixing layers. Linear stability of the coherent motions called monami or honami is adressed using a relatistically-computed velocity profile, then compared to the results obtained with the customary piecewise linear velocity profile. Then, drag force variations are taken into account as soon as velocity profile computing. The result is that drag happens to have a destabilizing effect on the flow, instead of the commonly admitted damping effect

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Howden, Nicholas John Kenneth. "Hydrogeological controls on surface/groundwater interactions in a lowland permeable chalk catchment : implications for water quality and numerical modelling." Thesis, Imperial College London, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.431082.

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WOLDIE, Daniel Werede. "Understanding the Role of a Less-permeable Surface in Water Dynamics of Headwater Catchments based on Various Monitoring, Analytical Methods and a Numerical Model." 京都大学 (Kyoto University), 2011. http://hdl.handle.net/2433/142387.

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Amorós, Morote Carlos Enrique, and Ulloa José Carlos Bendezú. "Diseño de mezcla de concreto permeable para la construcción de la superficie de rodadura de un pavimento de resistencia de 210 kg/cm2." Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2019. http://hdl.handle.net/10757/626313.

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El concreto permeable es un concreto especial, el cual permite el paso del agua a través de su estructura gracias al alto porcentaje de vacíos que posee a diferencia del concreto tradicional. Esta cualidad del concreto permeable permite acabar con la falta de permeabilidad en las estructuras tradicionales de concreto evitando las fallas estructurales debido al encharcamiento y escurrimiento del agua. En esta investigación se realizó el diseño de mezcla del concreto permeable con una resistencia de 210 kg/cm2, aplicando el método ACI 522.R para poder aplicarlo como una alternativa de carpeta de rodadura en pavimentos. Para ello se realizaron diferentes diseños de mezcla en laboratorio hasta encontrar el diseño óptimo para obtener una resistencia a la compresión de 210 kg/cm2, el diseño de mezcla elegido contaba con las siguientes características: relación agua/cemento de 0.38, porcentaje de vacíos de 13%, 1.5% de aditivo Superplastificante y 7% de arena. Para validar la investigación se realizó la construcción de un prototipo con el diseño elaborado en laboratorio con un área de 2.00 m2 (1.00m x 2.00m). Al concreto en estado fresco se le analizaron sus características de consistencia, densidad y contenido de vacíos; en el estado endurecido se realizaron los ensayos de compresión, permeabilidad y flexión, además de aplicarle una prueba de carga. Los resultados indicaron que el diseño de mezcla usado en el prototipo con resistencia a la compresión de 261.58 kg/cm2 y permeabilidad de 0.01744 m/s puede usarse como alternativa de superficie de rodadura para un pavimento.
Pervious concrete is a special type of concrete which allows the passage of water through its structure due to its high percentage of voids unlike traditional concrete. This quality of pervious concrete allows to end the lack of permeability in traditional concrete structures thus preventing structural failures due to flooding and water runoff. This research will seek to find a mix design for pervious concrete to apply it as an alternative road surface for pavements. To verify the above, different mix designs were performed in laboratory to find the design that give us a compressive strength of 210 kg/cm2, the chosen design had the following features: water - cement ratio of 0.38, 13% air content, 1.5% additive superplasticizer and 7% of sand. To validate the research, a prototype was built with the chosen mix design, this prototype had an area of 2 m2 (1m x 2m). The fresh concrete was analyzed for its consistency, density, and void percentage; the hardened concrete was analyzed for its compressive strength, permeability and flexural strength, finally the prototype was load tested. The results indicated that the mix design used in the prototype with compressive strength of 261.58 kg/cm2 and a permeability of 0.01744 m/s can be used as an alternative rolling surface for pavements.
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Books on the topic "Permeable surfaces"

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Zeh, Helgard. Amenagement de surfaces herbeuses permeables: Rapport et recommandations. Berne: l'Office federal de la protection de l''environnement, 1987.

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Träubel, Harro. New Materials Permeable to Water Vapor. 1999.

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Bhattacharya, Sreedeep. Consumerist Encounters. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780190125561.001.0001.

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Economic liberalization and globalization in India in the early 1990s resulted in a whirlwind of consumerist activities. New material and visual temptations swept markets, infiltrated consumer minds through media, and aroused inhibited desires. This has engendered a fast-paced and relentless relationship with things and images that permeate our everyday lives. Consumerist Encounters elucidates how our all-consuming relationship with objects and their representations have transformed rapidly over the last few decades in contemporary urban India. It argues that ephemerality, frivolousness, and multiplicity of choice regulate our flirtatious encounters with commodities and their images as we restlessly use, exhaust, dispose, and move on. Such a trend is illustrated by examining a plethora of commodity-centric phenomena such as exclusion through apparel, eroticization of body images, population of the T-shirt surface with graphics and text, rise of business process outsourcing, instantaneous seeing and sharing of images, and rejection of material goods in junkyards and ruins. These explorations collectively shed light on the constant negotiation of our identities, statuses, and mobilities in the image-saturated commodity landscape.

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Book chapters on the topic "Permeable surfaces"

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Hoyal, David C. J. D., Marcus I. Bursik, Joseph F. Atkinson, and Joseph V. Depinto. "Filtration Enhances Suspended Sediment Deposition from Surface Water to Granular Permeable Beds." In The Interactions Between Sediments and Water, 157–71. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5552-6_17.

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Peichl, Jonas, Andreas Schwab, Markus Selzer, Hannah Böhrk, and Jens von Wolfersdorf. "Innovative Cooling for Rocket Combustion Chambers." In Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 51–64. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53847-7_3.

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Abstract Transpiration cooling in combination with permeable ceramic-matrix composite materials is an innovative cooling method for rocket engine combustion chambers, while providing high cooling efficiency as well as enhancing engine life time as demanded for future space transportation systems. In order to develop methods and tools for designing transpiration cooled systems, fundamental experimental investigations were performed. An experimental setup consisting of a serial arrangement of four porous carbon fiber reinforced carbon (C/C) samples is exposed to a hot gas flow. Perfused with cold air, the third sample is unperfused in order to assess the wake flow development over the uncooled sample as well as the rebuilding of the coolant layer. Hereby, the focus is on the temperature boundary layer, using a combined temperature/pitot probe. Additionally, the sample surface temperature distribution was measured using IR imaging. The experiments are supported by numerical simulations which are showing a good agreement with measurement data for low blowing ratios.

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Smith, David R., Kevin Earley, and Justin M. Lia. "Potential Application of ASTM C1701 for Evaluating Surface Infiltration of Permeable Interlocking Concrete Pavements." In Pervious Concrete, 1–9. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 2012. http://dx.doi.org/10.1520/stp104560.

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Cortier, O., M. Boutouil, and O. Maquaire. "Quantifying Benefits of Permeable Pavement on Surface Runoff, An Agent-Based-Model with NetLogo." In New Trends in Urban Drainage Modelling, 729–33. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99867-1_126.

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Blois, Gianluca, James L. Best, Kenneth T. Christensen, Richard J. Hardy, and Gregory H. Sambrook Smith. "Coherent Flow Structures in the Pore Spaces of Permeable Beds Underlying a Unidirectional Turbulent Boundary Layer: A Review and Some New Experimental Results." In Coherent Flow Structures at Earth's Surface, 43–62. Chichester, UK: John Wiley & Sons, Ltd, 2013. http://dx.doi.org/10.1002/9781118527221.ch4.

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Walloch, Craig, Heather J. Brown, and David R. Smith. "Development of a New Test Method for Determining the Surface Infiltration Rate of Permeable Unit Pavement Systems." In Masonry 2014, 319–34. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 2014. http://dx.doi.org/10.1520/stp157720130180.

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Hoenich, N., and D. Malik. "Membranes and permeable films." In Surfaces and Interfaces for Biomaterials. CRC Press, 2005. http://dx.doi.org/10.1201/9781439823644.ch4.

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HOENICH, N. A., and D. MALIK. "Membranes and permeable films." In Surfaces and Interfaces for Biomaterials, 83–102. Elsevier, 2005. http://dx.doi.org/10.1533/9781845690809.1.83.

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"Aerogels Utilizations in Batteries." In Aerogels II, 99–120. Materials Research Forum LLC, 2021. http://dx.doi.org/10.21741/9781644901298-6.

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Aerogels, a nanoscale 3D mesoporous spongy sample of enhanced surface area, was usually considered as insulator for thermal application, catalyst, and as radiation detector. Presently, it is investigated as potential candidate for electrochemistry due to its inborn capacity to enhance the characteristic features of the surfaces of commercial active materials in batteries and ultracapacitors. Recently composite aerogels which is blended with metal oxides, metal sulphides and so on have been set up as low thickness, profoundly permeable, and large amount of accessible surface and examined as active electrodes. This type of aerogel-based composites challenges the standard manners by that electrochemically active materials are considered, examined, and employed.

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Hecker, Sharon. "“Impressionist Sculptor”?" In Moment's Monument. University of California Press, 2017. http://dx.doi.org/10.1525/california/9780520294486.003.0004.

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This chapter examines the shift that emerged in Medardo Rosso's art from 1883 onward, when he made a new series of sculptural experiments that came to be labeled Scapigliato, Verista, and Impressionist by several critics. Another critic associated his art with the techniques of the Tuscan Macchiaioli of the previous generation; by 1887, it was being explicitly associated with French Impressionism. The chapter analyzes what might have been known in Italy about French Impressionism in the 1880s and assesses its reception in the art and literature of the time. It follows with a close analysis of Rossos innovative sculptures of urban subjects like Carne altrui (Flesh of Others) and La Portinaia (Concierge, both 1883–84), whose broken-up, painterly surfaces became permeable to transient effects of light, shadow, and atmosphere.

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Conference papers on the topic "Permeable surfaces"

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Norasikin, Mohd Adili, Diego Martinez-Plasencia, Gianluca Memoli, and Sriram Subramanian. "SonicSpray: A Technique to Reconfigure Permeable Mid-Air Displays." In ISS '19: Interactive Surfaces and Spaces. New York, NY, USA: ACM, 2019. http://dx.doi.org/10.1145/3343055.3359704.

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Bilchenko, Natalya. "Permeable surfaces hypersonic aircraft optimal heat protection mathematical modeling." In 2015 International Conference "Stability and Control Processes" in Memory of V.I. Zubov (SCP). IEEE, 2015. http://dx.doi.org/10.1109/scp.2015.7342145.

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Bowen, Luke, Alper Celik, Mahdi Azarpeyvand, and Carlos R. Ilario da Silva. "On the use of Tailored Permeable Surfaces for Turbulence Interaction Noise Control." In AIAA AVIATION 2020 FORUM. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2020. http://dx.doi.org/10.2514/6.2020-2530.

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Epifanov, V. M., A. A. Kurakin, and A. P. Kareev. "INTEGRAL METHOD OF CALCULATING TEMPERATURE STATES OF CURVED CHANNEL PERMEABLE ENDWALL SURFACES." In International Heat Transfer Conference 9. Connecticut: Begellhouse, 1990. http://dx.doi.org/10.1615/ihtc9.2710.

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Owen, John R., and Jennifer S. Wayne. "Influence of Loading Conditions and the Superficial Tangential Zone in Contact Models of Articular Surfaces." In ASME 2009 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2009. http://dx.doi.org/10.1115/sbc2009-206143.

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Engineering tissue to repair articular surface defects remains a challenge. Normal zonal characteristics of articular cartilage throughout its thickness, particularly the superficial tangential zone (STZ), and normal material properties have not been reproduced in vitro in scaffolds nor in vivo in repairing defects. Without sufficient quality, such transplanted scaffolds in vivo may be doomed mechanically from the outset. The importance of the STZ in normal function [1–3] and deficient behavior of repair tissue [4–5] is well documented in the literature. Studies have modeled higher tensile properties in the STZ via transverse isotropy [6–9] or tension-compression nonlinearity [10] to better predict experimental results. Models incorporating an STZ with strain-dependent permeability [11–13] have indicated protection of underlying repairs. Permeable and impermeable rigid contact models [12] have been thought to bracket in vivo conditions. Recent efforts have been to create more complex models to better represent in vivo conditions [13]. This finite element study compares permeable and impermeable rigid contact models with a more realistic model to determine if the added complexity is warranted.

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Ngo, C. C., and F. C. Lai. "Study on Natural Convection From a Buried Pipe With Backfill." In ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference collocated with the ASME 2007 InterPACK Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ht2007-32882.

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Heat transfer and fluid flow induced by thermal buoyancy from a buried pipe with backfill has been examined in this study. Hele-Shaw cells with different gap widths were constructed to simulate a porous medium with distinct permeablities. The flow visualization experiment was set up to investigate how a step change in the permeability of a backfill would affect the flow patterns from a heated pipe. Both permeable and impermeable top surfaces with different buoyancy strengths were considered in this experiment. Using time-elapsed photographs, one observes that the flow fields for permeable and impermeable top boundaries displayed distinct characteristics. The presence of recirculating cell in the more permeable layer was confirmed. The flow fields predicted by numerical work are in good agreement with those observed in the experiment. Thus it is expected that the actual flow field would closely resemble those reported in the present study.

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Bilchenko, Grigory, and Natalya Bilchenko. "The one-dimensional and two-dimensional inverse problems of heat and mass transfer on hypersonic aircraft permeable surfaces." In 2017 Constructive Nonsmooth Analysis and Related Topics (dedicated to the memory of V.F. Demyanov) (CNSA). IEEE, 2017. http://dx.doi.org/10.1109/cnsa.2017.7973940.

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Chong, William, Mircea Teodorescu, Ashlie Martini, and Homer Rahnejat. "Mechanisms of Entrapment and Release of Fluid Droplets From Nano-Scale Surface Features." In ASME/STLE 2012 International Joint Tribology Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/ijtc2012-61201.

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Engineering surfaces are never perfectly flat. They contain micro and nano-scale features on multiple length scales. Predicting the amount of fluid trapped in these minute surface crevices and its controlled release could benefit a variety of practical applications. In a sliding contact, the released fluid could create an ultra-thin film, reducing the direct contact and consequently the boundary friction. Transdermal patches are the least invasive of available subcutaneous drug delivery techniques. The drug is stored in a micro-reservoir and it is released to the skin either through a permeable membrane or through a series of micro needles. The aim of the current paper represents the first attempt to investigate whether a modeling approach encompassing two complementary simulation techniques in an integrated framework can be used to predict the volume of fluid stored in a nano-scale surface feature. Molecular dynamics (MD) simulation could provide accurate modeling of fluid behavior at nano-scale, and statistical mechanics (SM) could provide a fast prediction.

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Kendall-Torry, Christofer, and Florian Danner. "Investigations on Direct and Hybrid Sound Predictions." In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-57612.

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As a result of dissipative and dispersive properties of numerical methods the accuracy of direct noise prediction degrades with increasing distance from the source. Hybrid approaches are hence applied to predict the acoustic farfield, which rely on an integration of disturbance quantities extracted from the nearfield flow solutions. In order to elaborate the influence of the integration limits on sound prediction, different approaches of the Ffowcs Williams and Hawkings method are systematically applied to an advanced counter rotating propfan configuration within the present study. The solutions of various permeable and impermeable integration surfaces are analysed with respect to nearfield sound radiation and compared against direct sound predictions from the compressible Reynolds-averaged Navier-Stokes solutions which likewise serve as input for the extrapolation routine. Due to the flexibility of the routine, source terms and zones can be selectively excluded from the surface integration, allowing a systematic identification of the origin of dissimilar sound prediction. Subsequent farfield analyses are used to conclude on the propagation and persistency of differences identified in the nearfield predictions.

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Rajendran, Nanthini, Bhamidi Prasad, and Y. V. S. S. Sanyasiraju. "Development of Turbine Blade Profiles Using Iterative Inverse Design Methodology." In ASME 2017 Gas Turbine India Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gtindia2017-4553.

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An iterative inverse design methodology is used to design gas turbine blades for the prescribed flow conditions. The input flow parameter considered here is the pressure distribution along the suction and pressure surfaces of the blade. The flow is regarded as inviscid. A guess blade is presumed and the flow analysis over the blade is determined using the existing commercial software. In case of mismatch of the flow parameters, the guessed profile surface is considered as a permeable membrane and the normal velocity on the blade surface is computed by conservation of momentum flux approach. The computed normal velocity is used to revise the blade geometry by mass conservation principle till the flow parameters converge. A few geometric constraints are enforced on the model to avoid quixotic blade model. The validation of the above method is being done using NACA profiles. The robustness of the method is verified by using various combinations of NACA blade profiles, where different initial guessed profiles are taken for the same prescribed pressure distribution. This approach can be extended to three dimensional cases. To incorporate the complications attached with the three dimensional flows, three two dimensional sections can be considered on the blade geometry namely at hub, mid span and tip.

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Reports on the topic "Permeable surfaces"

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Simmons, Carver S., and Jason M. Keller. Liquid Spills on Permeable Soil Surfaces: Experimental Confirmations. Office of Scientific and Technical Information (OSTI), September 2005. http://dx.doi.org/10.2172/888713.

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Keller, Jason M., and Carver S. Simmons. The Influence of Selected Liquid and Soil Properties on the Propagation of Spills over Flat Permeable Surfaces. Office of Scientific and Technical Information (OSTI), February 2005. http://dx.doi.org/10.2172/15011818.

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Robert S. Bowman, Pengfei Zhang, and Xian Tao. SURFACE-ALTERED ZEOLITES AS PERMEABLE BARRIERS FOR IN SITU TREATMENT OF CONTAMINATED GROUNDWATER. Office of Scientific and Technical Information (OSTI), March 2002. http://dx.doi.org/10.2172/824865.

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Bowman, Robert S., Pengfei Zhang, Xian Tao, Richard L. Johnson, and Douglas Wolf. SURFACE-ALTERED ZEOLITES AS PERMEABLE BARRIERS FOR IN SITU TREATMENT OF CONTAMINATED GROUNDWATER. Office of Scientific and Technical Information (OSTI), March 2002. http://dx.doi.org/10.2172/794323.

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Robert S. Bowman, Zhaohui Li, Stephen J. Roy, Todd Burt, Timothy L. Johnson, and Richard L. Johnson. SURFACE-ALTERED ZEOLITES AS PERMEABLE BARRIERS FOR IN SITU TREATMENT OF CONTAMINATED GROUNDWATER. Office of Scientific and Technical Information (OSTI), August 1999. http://dx.doi.org/10.2172/772441.

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Guidati, Gianfranco, and Domenico Giardini. Joint synthesis “Geothermal Energy” of the NRP “Energy”. Swiss National Science Foundation (SNSF), February 2020. http://dx.doi.org/10.46446/publication_nrp70_nrp71.2020.4.en.

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Near-to-surface geothermal energy with heat pumps is state of the art and is already widespread in Switzerland. In the future energy system, medium-deep to deep geothermal energy (1 to 6 kilometres) will, in addition, play an important role. To the forefront is the supply of heat for buildings and industrial processes. This form of geothermal energy utilisation requires a highly permeable underground area that allows a fluid – usually water – to absorb the naturally existing rock heat and then transport it to the surface. Sedimentary rocks are usually permeable by nature, whereas for granites and gneisses permeability must be artificially induced by injecting water. The heat gained in this way increases in line with the drilling depth: at a depth of 1 kilometre, the underground temperature is approximately 40°C, while at a depth of 3 kilometres it is around 100°C. To drive a steam turbine for the production of electricity, temperatures of over 100°C are required. As this requires greater depths of 3 to 6 kilometres, the risk of seismicity induced by the drilling also increases. Underground zones are also suitable for storing heat and gases, such as hydrogen or methane, and for the definitive storage of CO2. For this purpose, such zones need to fulfil similar requirements to those applicable to heat generation. In addition, however, a dense top layer is required above the reservoir so that the gas cannot escape. The joint project “Hydropower and geo-energy” of the NRP “Energy” focused on the question of where suitable ground layers can be found in Switzerland that optimally meet the requirements for the various uses. A second research priority concerned measures to reduce seismicity induced by deep drilling and the resulting damage to buildings. Models and simulations were also developed which contribute to a better understanding of the underground processes involved in the development and use of geothermal resources. In summary, the research results show that there are good conditions in Switzerland for the use of medium-deep geothermal energy (1 to 3 kilometres) – both for the building stock and for industrial processes. There are also grounds for optimism concerning the seasonal storage of heat and gases. In contrast, the potential for the definitive storage of CO2 in relevant quantities is rather limited. With respect to electricity production using deep geothermal energy (> 3 kilometres), the extent to which there is potential to exploit the underground economically is still not absolutely certain. In this regard, industrially operated demonstration plants are urgently needed in order to boost acceptance among the population and investors.

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Surface altered zeolites as permeable barriers for in situ treatment of contaminated groundwater. Office of Scientific and Technical Information (OSTI), November 1996. http://dx.doi.org/10.2172/650198.

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