Relevant bibliographies by topics / Capillarity on rough surfaces

Academic literature on the topic 'Capillarity on rough surfaces'

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Published: 14 March 2023

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Journal articles on the topic "Capillarity on rough surfaces"

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Kim, Tae Wan, and Bharat Bhushan. "The adhesion model considering capillarity for gecko attachment system." Journal of The Royal Society Interface 5, no. 20 (June 26, 2007): 319–27. http://dx.doi.org/10.1098/rsif.2007.1078.

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Geckos make use of approximately a million microscale hairs (setae) that branch off into hundreds of nanoscale spatulae to cling to different smooth and rough surfaces and detach at will. This hierarchical surface construction gives the gecko the adaptability to create a large real area of contact with surfaces. It is known that van der Waals force is the primary mechanism used to adhere to surfaces, and capillary force is a secondary effect that can further increase adhesive force. To investigate the effects of capillarity on gecko adhesion, we considered the capillary force as well as the solid-to-solid interaction. The capillary force expressed in terms of elliptical integral is calculated by numerical method to cope with surfaces with a wide range of contact angles. The adhesion forces exerted by a single gecko spatula in contact with planes with different contact angles for various relative humidities are calculated, and the contributions of capillary force to total adhesion force are evaluated. The simulation results are compared with experimental data. Finally, using the three-level hierarchical model recently developed to simulate a gecko seta contacting with random rough surface, the effect of the relative humidity and the hydrophobicity of surface on the gecko adhesion is investigated.
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Anand, Utkarsh, Tanmay Ghosh, Zainul Aabdin, Siddardha Koneti, XiuMei Xu, Frank Holsteyns, and Utkur Mirsaidov. "Dynamics of thin precursor film in wetting of nanopatterned surfaces." Proceedings of the National Academy of Sciences 118, no. 38 (September 17, 2021): e2108074118. http://dx.doi.org/10.1073/pnas.2108074118.

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The spreading of a liquid droplet on flat surfaces is a well-understood phenomenon, but little is known about how liquids spread on a rough surface. When the surface roughness is of the nanoscopic length scale, the capillary forces dominate and the liquid droplet spreads by wetting the nanoscale textures that act as capillaries. Here, using a combination of advanced nanofabrication and liquid-phase transmission electron microscopy, we image the wetting of a surface patterned with a dense array of nanopillars of varying heights. Our real-time, high-speed observations reveal that water wets the surface in two stages: 1) an ultrathin precursor water film forms on the surface, and then 2) the capillary action by nanopillars pulls the water, increasing the overall thickness of water film. These direct nanoscale observations capture the previously elusive precursor film, which is a critical intermediate step in wetting of rough surfaces.
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Jansons, Kalvis M. "Moving contact lines on a two-dimensional rough surface." Journal of Fluid Mechanics 154 (May 1985): 1–28. http://dx.doi.org/10.1017/s0022112085001392.

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The dynamic contact angle for a contact line moving over a solid surface with random sparse spots of roughness is determined theoretically in the limit of zero capillary number. The model exhibits many of the observed characteristics of moving contact lines on real rough surfaces, including contact-angle hysteresis and stick-slip. Several types of rough surface are considered, and a comparison is made between periodic and random rough surfaces.
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Schoen, Martin. "Capillary condensation between mesocopically rough surfaces." Colloids and Surfaces A: Physicochemical and Engineering Aspects 206, no. 1-3 (July 2002): 253–66. http://dx.doi.org/10.1016/s0927-7757(02)00080-8.

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Crawford, Niall, Thomas Endlein, Jonathan T. Pham, Mathis Riehle, and W. Jon P. Barnes. "When the going gets rough – studying the effect of surface roughness on the adhesive abilities of tree frogs." Beilstein Journal of Nanotechnology 7 (December 30, 2016): 2116–31. http://dx.doi.org/10.3762/bjnano.7.201.

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Tree frogs need to adhere to surfaces of various roughnesses in their natural habitats; these include bark, leaves and rocks. Rough surfaces can alter the effectiveness of their toe pads, due to factors such as a change of real contact area and abrasion of the pad epithelium. Here, we tested the effect of surface roughness on the attachment abilities of the tree frog Litoria caerulea. This was done by testing shear and adhesive forces on artificial surfaces with controlled roughness, both on single toe pads and whole animal scales. It was shown that frogs can stick 2–3 times better on small scale roughnesses (3–6 µm asperities), producing higher adhesive and frictional forces, but relatively poorly on the larger scale roughnesses tested (58.5–562.5 µm asperities). Our experiments suggested that, on such surfaces, the pads secrete insufficient fluid to fill the space under the pad, leaving air pockets that would significantly reduce the Laplace pressure component of capillarity. Therefore, we measured how well the adhesive toe pad would conform to spherical asperities of known sizes using interference reflection microscopy. Based on experiments where the conformation of the pad to individual asperities was examined microscopically, our calculations indicate that the pad epithelium has a low elastic modulus, making it highly deformable.
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Escobar, Juan V., Cristina Garza, and Rolando Castillo. "Measuring adhesion on rough surfaces using atomic force microscopy with a liquid probe." Beilstein Journal of Nanotechnology 8 (April 10, 2017): 813–25. http://dx.doi.org/10.3762/bjnano.8.84.

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We present a procedure to perform and interpret pull-off force measurements during the jump-off-contact process between a liquid drop and rough surfaces using a conventional atomic force microscope. In this method, a micrometric liquid mercury drop is attached to an AFM tipless cantilever to measure the force required to pull this drop off a rough surface. We test the method with two surfaces: a square array of nanometer-sized peaks commonly used for the determination of AFM tip sharpness and a multi-scaled rough diamond surface containing sub-micrometer protrusions. Measurements are carried out in a nitrogen atmosphere to avoid water capillary interactions. We obtain information about the average force of adhesion between a single peak or protrusion and the liquid drop. This procedure could provide useful microscopic information to improve our understanding of wetting phenomena on rough surfaces.
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de Boer, M. P., and P. C. T. de Boer. "Thermodynamics of capillary adhesion between rough surfaces." Journal of Colloid and Interface Science 311, no. 1 (July 2007): 171–85. http://dx.doi.org/10.1016/j.jcis.2007.02.051.

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de Boer, M. P. "Capillary Adhesion Between Elastically Hard Rough Surfaces." Experimental Mechanics 47, no. 1 (January 10, 2007): 171–83. http://dx.doi.org/10.1007/s11340-006-0631-z.

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Thomas, Myles, Elizabeth Krenek, and Stephen Beaudoin. "Capillary Forces Described by Effective Contact Angle Distributions via Simulations of the Centrifuge Technique." MRS Advances 1, no. 31 (2016): 2237–45. http://dx.doi.org/10.1557/adv.2016.516.

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ABSTRACTUnderstanding particle adhesion is vital to any industry where particulate systems are involved. There are multiple factors that affect the strength of the adhesion force, including the physical properties of the interacting materials and the system conditions. Surface roughness on the particles and the surfaces to which they adhere, including roughness at the nanoscale, is critically important to the adhesion force. The focus of this work is on the capillary force that dominates the adhesion whenever condensed moisture is present. Theoretical capillary forces were calculated for smooth particles adhered to smooth and rough surfaces. Simulations of the classical centrifuge technique used to describe particle adhesion to surfaces were performed based on these forces. A model was developed to describe the adhesion of the particles to the rough surface in terms of the adhesion to a smooth surface and an ‘effective’ contact angle distribution.
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Kubochkin, Nikolai, and Tatiana Gambaryan-Roisman. "Edge wetting: Steady state of rivulets in wedges." Physics of Fluids 34, no. 4 (April 2022): 042112. http://dx.doi.org/10.1063/5.0086967.

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The geometry of rough, textured, fractured, and porous media is topologically complicated. Such media are commonly modeled as bundles of capillary tubes. However, angle-containing geometries can serve as a more realistic portrayal of their internal structure. A basic element inherent to all of these media is an open wedge-like channel. The classical theory of capillarity ignoring intermolecular interactions implies that liquid entering a wedge must propagate indefinitely along its spine when the liquid–gas interface is concave. This is well known as the Concus–Finn condition. In the present paper, we show that steady-state rivulets can be formed in such channels when surface forces are taken into account. We present a simple model based on the disjoining pressure approach and analyze the shape of rivulets in wedges. We also consider the case when the walls of the wedge are soft and can be deformed by the liquid.
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Dissertations / Theses on the topic "Capillarity on rough surfaces"

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Fedeli, Livio. "Numerical techniques for the study of wetting on rough surfaces and contact angle hysteresis." Doctoral thesis, SISSA, 2011. http://hdl.handle.net/20.500.11767/4256.

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LIU, WEN. "TRANSPORT PHENOMENA ASSOCIATED WITH LIQUID METAL FLOW OVER TOPOGRAPHICALLY MODIFIED SURFACES." UKnowledge, 2012. http://uknowledge.uky.edu/me_etds/16.

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Brazing and soldering, as advanced manufacturing processes, are of significant importance to industrial applications. It is widely accepted that joining by brazing or soldering is possible if a liquid metal wets the solids to be joined. Wetting, hence spreading and capillary action of liquid metal (often called filler) is of significant importance. Good wetting is required to distribute liquid metal over/between the substrate materials for a successful bonding. Topographically altered surfaces have been used to exploit novel wetting phenomena and associated capillary actions, such as imbibitions (a penetration of a liquid front over/through a rough, patterned surface). Modification of surface roughness may be considered as a venue to tune and control the spreading behavior of the liquids. Modeling of spreading of liquids on rough surface, in particular liquid metals is to a large extent unexplored and constitutes a cutting edge research topic. In this dissertation the imbibitions of liquid metal has been considered as pertained to the metal bonding processes involving brazing and soldering fillers. First, a detailed review of fundamentals and the recent progress in studies of non-reactive and reactive wetting/capillary phenomena has been provided. An imbibition phenomenon has been experimentally achieved for organic liquids and molten metals during spreading over topographically modified intermetallic surfaces. It is demonstrated that the kinetics of such an imbibition over rough surfaces follows the Washburn-type law during the main spreading stage. The Washburn-type theoretical modeling framework has been established for both isotropic and anisotropic non-reactive imbibition of liquid systems over rough surfaces. The rough surface domain is considered as a porous-like medium and the associated surface topographical features have been characterized either theoretically or experimentally through corresponding permeability, porosity and tortuosity. Phenomenological records and empirical data have been utilized to verify the constructed model. The agreement between predictions and empirical evidence appears to be good. Moreover, a reactive wetting in a high temperature brazing process has been studied for both polished and rough surfaces. A linear relation between the propagating triple line and the time has been established, with spreading dominated by a strong chemical reaction.
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Sahlin, Fredrik. "Hydrodynamic lubrication of rough surfaces." Licentiate thesis, Luleå : Luleå University of Technology, 2005. http://epubl.luth.se/1402-1757/2005/83.

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Lines, Claire Deborah. "Inverse scattering by unbounded rough surfaces." Thesis, Brunel University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.408886.

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Qi, Lin. "Measuring perceived gloss of rough surfaces." Thesis, Heriot-Watt University, 2012. http://hdl.handle.net/10399/2579.

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This thesis is concerned with the visual perception of glossy rough surfaces, specifically those characterised by 1/fB noise. Computer graphics were used to model these natural looking surfaces, which were generated and animated to provide realistic stimuli for observers. Different methods were employed to investigate the effects of varying surface roughness and reflection model parameters on perceived gloss. We first investigated how the perceived gloss of a matte Lambertian surface varies with RMS roughness. Then we estimated the perceived gloss of moderate RMS height surfaces rendered using a gloss reflection model. We found that adjusting parameters of the gloss reflection model on the moderate RMS height surfaces produces similar levels of gloss to the high RMS height Lambertian surfaces. More realistic stimuli were modelled using improvements in the reflection model, rendering technique, illumination and viewing conditions. In contrast with previous research, a non-monotonic relationship was found between perceived gloss and mesoscale roughness when microscale parameters were held constant. Finally, the joint effect of variations in mesoscale roughness (surface geometry) and microscale roughness (reflection model) on perceived gloss was investigated and tested against conjoint measurement models. It was concluded that perceived gloss of rough surfaces is significantly affected by surface roughness in both mesoscale and microscale and can be described by a full conjoint measurement model.
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Turbil, Colette. "Light Scattering from Complex Rough Surfaces." Electronic Thesis or Diss., Sorbonne université, 2018. http://www.theses.fr/2018SORUS205.

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Lorsque la lumière interagit avec un objet, deux phénomènes peuvent avoir lieu : la lumière peut être absorbée ou déviée par l’objet, ce dernier phénomène étant généralement qualifié de diffusion de la lumière. Malgré l’intérêt de la communauté scientifique au cours des dernières décennies, la diffusion de la lumière induite par des surfaces rugueuses reste un problème complexe à traiter, ceci étant principalement dû à la grande multidisciplinarité requise pour l’étude du phénomène. Ce travail multidisciplinaire est basé sur l’étude de quatre différents domaines scientifiques qui doivent être considérés en parallèle pour traiter le phénomène de diffusion de la lumière de manière globale. Une vingtaine d’échantillons, fabriqués au laboratoire ou par des procédés industriels, sont sélectionnés pour leurs différentes apparences visuelles. Leur morphologie est caractérisée grâce à trois dispositifs expérimentaux, qui permettent ainsi de décrire la rugosité sur quatre décades de fréquences spatiales. Ensuite, la distribution angulaire de l’intensité lumineuse diffusée par les échantillons est mesurée, et confirme la grande variété des propriétés optiques des surfaces examinées. Finalement, ces données expérimentales sont utilisées et comparées aux résultats de deux types de modèles de diffusion de la lumière, l’un basé sur l’optique géométrique et l’autre sur l’optique physique. L’étude montre que les propriétés optiques des échantillons étudiés peuvent être assez fidèlement reproduites par le modèle de diffusion de la lumière basé sur l’optique physique. En revanche, le modèle basé sur les lois de l’optique géométrique ne parvient pas à produire des résultats satisfaisants
When light interacts with an object, two types of phenomena can occur: light can be either absorbed or redirected by the object. The latter phenomenon is generally referred to as light scattering. Despite the significant efforts over the past decades of the scientific community, light scattering from rough surfaces remains a complex problem. This is partly due to the high degree of multidisciplinary that is required for its study. The present multidisciplinary study is related to four scientific domains that must be examined to consider the full light scattering phenomenon. First, a large panel of a rough surface, elaborated by ourselves in the laboratory or manufactured industrially, is selected for its wide range of visual aspect. The morphology of the samples are characterized using three experimental tools which allow us to describe their surface morphologies over four decades of spatial frequencies. Then the angular intensity distributions of the light scattered from the samples are measured which confirm the wide variety of optical properties of the samples. Finally, these reliable and representative experimental data are compared to the results of different light scattering models, based on both the physical and the geometrical optics approaches. The main conclusion we drew from this work is that for the examined surfaces, the light scattering can be approximated fairly well by a model based on the physical optics approach, while at the same time, geometrical optics models are not able to give an adequate description of the same scattering data
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Schwarzer, Norbert. "Modelling of Contact Problems of Rough Surfaces." Universitätsbibliothek Chemnitz, 2006. http://nbn-resolving.de/urn:nbn:de:swb:ch1-200600165.

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In this paper it is shown that a completely analytical theory based on the extended Hertzian approach together with additional considerations taking into account the geometrical conditions of a curved surface provide an appropriate model for the theoretical “simulation” of a variety of asperity contact problems. This model yields relatively fast and easy to use tools for the analysing of contact problems arising in connection with rough surfaces. In this study the results are shown on the example of a 3µm-DLC-coating on a steel substrate with asperities of about 100µm in diameter and 15µm height. It is found, that – under a general average pressure of 1GPa – the ideal asperity tip contact situation would lead to severe damage due to plastic flow within the steel substrate. On the other hand a rather conforming contact situation appears to be completely non critical.
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Andersson, Robin. "Flow Over Large-Scale Naturally Rough Surfaces." Licentiate thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-136.

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The fluid mechanical field of rough surface flows has been developed ever since the first experiments by Haagen (1854) and Darcy (1857). Although old, the area still holds merit and a surprising amount of information have to this day yet to be fully understood, which surely is a proof of its complexity. Many equations and CFD tools still rely on old, albeit reliable, concepts for simplifying the flow to be able to handle the effects of surface roughness. This notion is, however, likely to change within a not so unforeseeable future. The advancement of computer power has opened the door for more advanced CFD tools such as Direct Numerical Simulation (DNS) and Large Eddy Simulation (LES). It can be argued that once a given flow situation has been fully accessible by numerical simulations, it is likely to be fully understood within a few years 1 . However, DNS is still limited to small scales of roughness and relatively low Reynolds number which is in contrast with given hydropower conditions today. The hydropower industry annually supplies Sweden with about 45% of its electricity production, and tunnels of various types are regularly used for conveying water to or from turbines within hydropower stations. The tunnels are a vital part of the system and their survival is of the essence. Depending on the manner of excavation, the walls of the tunnels regularly exhibit a roughness, this roughness may range from a few mm to m, which is true especially if the tunnel have been subjected to damage. For natural roughness e.g. hydropower tunnels, there is no clear way to distinguish between rough surface flows and flow past obstacles. Yet, to be able to distinguish between the two cases has proven to be important. This work is aimed to increase the understanding of how the wall roughness affects the flow, and how to treat it numerically. Paper A employs the use of pressure sensors to evaluate local deviations in pressure as well as head loss due to the surface roughness. Paper B is aimed at using PIV to evaluate the flow using averaging techniques and characteristic length scales. Paper C Further investigates the data from the PIV and pressure measurements and Evaluates the possibility to use basic but versatile turbulence models to evaluate the flow in such tunnels.
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Morales, Espejel Guillermo Enrique. "Elastohydrodynamic lubrication of smooth and rough surfaces." Thesis, University of Cambridge, 1993. https://www.repository.cam.ac.uk/handle/1810/260244.

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Different aspects of Elastohydrodynamic Lubrication (EHL) are studied. For smooth surfaces, a novel approach which solves separately the inlet and outlet regions by using the fracture mechanics equations, is proposed to solve EHL line contacts for shape and pressure. For rough surfaces, the full EHL geometry is reduced to an infinitely long contact with known mean film thickness and pressure; so real-roughness steady state analyses are carried out by considering the separate Fourier components of roughness and pressures, transient analysis by applying general finite difference methods. The subsurface stresses under micro-EHL are also calculated and given in form of a probability rather than a specific value and location. Initially, full-geometry EHL line contacts of smooth surfaces are studied. The spike of pressures is assumed to be singular and the idea is to start with an original Hertzian pressure distribution, then the edges of this pressure are truncated and the effects calculated via linear fracture mechanics; after this, the removed pressures are replaced by the converged inlet and outlet pressures, previously obtained by iterating the Reynolds and fracture mechanics equations. It is found that the outlet pressures follow a modified logarithmic function and therefore the exit bump in the shape joins the parallel film zone with a finite value of slope, unlike the Greenwood extension of Grubin's theory. From a set of solutions, the behaviour of the pressure spike as a function of two dimensionless numbers is followed. Comparisons with results from full numerical solutions are shown, giving good agreement. The scheme is later extended to consider compressibility and the Roelands viscosity law. After reducing full EHL geometry, the effects of real and wavy roughness in microEHL of Newtonian and Eyring fluids with or without compressibility are studied. Steady state analyses of real roughness show that only the high frequency components remain after deformation. By linearizing the Reynolds- Eyring equation an analytical solution is obtained and a criterion for the deformation of the roughness in EHL is given; from this, it is shown that the deformation is very much dependent on the ratio λ/ħ, obtaining little deformation for low values of it. Transient analyses of roughness in lubrication are also carried out considering the infinitely long contact. It is found that the transient pressure and film distributions are made of two parts: a) the well known steady state solution, plus b) a complementary function depending only on the modulation of film and pressures from the inlet. It is shown that the conclusions outlined for some authors (e.g. Venner and Lubrecht) about pressures travelling with the velocity of the roughness but shape with the average velocity of the lubricant, are only a particular case of a more general understanding. It is now believed that there is no a real physical damping in the transient shape.
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Ross, Christopher Roger. "Direct and inverse scattering by rough surfaces." Thesis, Brunel University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318675.

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Books on the topic "Capillarity on rough surfaces"

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Equilibrium capillary surfaces. New York: Springer-Verlag, 1986.

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Finn, Robert. Equilibrium capillary surfaces. New York: Springer-Verlag, 1985.

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Finn, Robert. Equilibrium Capillary Surfaces. New York, NY: Springer New York, 1986.

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Voronovich, Alexander. Wave Scattering from Rough Surfaces. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999.

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Voronovich, Alexander G. Wave Scattering from Rough Surfaces. Berlin, Heidelberg: Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/978-3-642-97544-8.

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Voronovich, Alexander. Wave Scattering from Rough Surfaces. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-59936-1.

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Voronovich, Alexander G. Wave Scattering from Rough Surfaces. Berlin, Heidelberg: Springer Berlin Heidelberg, 1994.

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Wave scattering from rough surfaces. 2nd ed. Berlin: Springer, 1999.

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Voronovich, Alexander G. Wave scattering from rough surfaces. Berlin: Springer-Verlag, 1994.

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Pawlus, Pawel, Andrzej Dzierwa, and Agnieszka Lenart. Dry Gross Fretting of Rough Surfaces. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-31563-4.

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Book chapters on the topic "Capillarity on rough surfaces"

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Ling, Frederick F., W. Michael Lai, and Don A. Lucca. "Rough Surfaces." In Mechanical Engineering Series, 229–49. New York, NY: Springer New York, 2002. http://dx.doi.org/10.1007/978-0-387-21776-5_7.

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Lekner, John. "Rough surfaces." In Theory of Reflection of Electromagnetic and Particle Waves, 205–19. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-015-7748-9_11.

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Kim, Yootai, Raghu Machiraju, and David Thompson. "Modeling Rough Surfaces." In Geometric Modeling for Scientific Visualization, 123–37. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-07443-5_8.

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Barber, J. R. "Contact of Rough Surfaces." In Solid Mechanics and Its Applications, 329–94. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-70939-0_16.

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Chow, T. S. "Rough Surfaces and Interfaces." In Mesoscopic Physics of Complex Materials, 158–92. New York, NY: Springer New York, 2000. http://dx.doi.org/10.1007/978-1-4612-2108-1_8.

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Edition, Pilot. "Analyzing Rough Surfaces Digitally." In Fractals in Science, 286–307. New York, NY: Springer New York, 1994. http://dx.doi.org/10.1007/978-1-4615-7012-7_7.

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Biryukov, Sergey V., Yuri V. Gulyaev, Victor V. Krylov, and Victor P. Plessky. "Waves on Rough Surfaces." In Springer Series on Wave Phenomena, 282–300. Berlin, Heidelberg: Springer Berlin Heidelberg, 1995. http://dx.doi.org/10.1007/978-3-642-57767-3_13.

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Law, Kock-Yee, and Hong Zhao. "Wetting on Rough Surfaces." In Surface Wetting, 55–98. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-25214-8_4.

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Greenwood, J. A. "Contact of Rough Surfaces." In Fundamentals of Friction: Macroscopic and Microscopic Processes, 37–56. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2811-7_3.

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Popov, Valentin L. "Contact between Rough Surfaces." In Contact Mechanics and Friction, 81–103. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-10803-7_7.

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Conference papers on the topic "Capillarity on rough surfaces"

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Streator, Jeffrey L., and Robert L. Jackson. "Critical Conditions for Liquid Mediated Collapse of Two-Dimensional Rough Surfaces." In ASME/STLE 2007 International Joint Tribology Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ijtc2007-44411.

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Small-scale devices are particularly vulnerable to adverse effects of adhesion because of large surface-area-to-volume ratios. Additionally, small gaps can be easily bridged at high humidity or when there are other contaminant liquids present. The bridging of a portion of the interface by a liquid droplet of given volume, tends to pull surfaces in closer proximity due to the sub-ambient pressures that arise. In turn, regions spanned by the bridge will increase in size and lead to a greater adhesive force. In the present work we develop a model for these effects in the presence of surface roughness. The influence of asperities on the surface is treated by means of a recently-developed multi-scale model that considers the full range of wavelengths comprising the surface profile. In the simulations, two nominally flat rough surfaces with profiles that vary only in one direction are brought together under a prescribed load. A liquid bridge of given volume (per unit depth) is then introduced into the contact, assuming an initial areal coverage. The interface configuration is then iterated until one is found that satisfies the equations of elasticity and capillarity for a given liquid volume. As a result of the simulation, critical values are found for combinations of parameters that delineate stable and unstable conditions.
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Goryacheva, I. G., and Yu Yu Makhovskaya. "Adhesive Component of Friction Between Rough Surfaces." In World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-63266.

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Adhesion forces associated with molecular attraction have substantial influence on the characteristics of contact and the friction force between highly smooth and chemically pure surfaces. Bodies coated by surface liquid films can also experience significant adhesive attraction due to capillary pressure in liquid menisci formed in the gap between such surfaces.
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Chockalingam, Sekkappan, Jong Eun Ryu, Md Didarul Islam, and Myers Harbinson. "Fabrication of Bioinspired Micro/Nano Textured Rough Surfaces Through the Scalable Roll Coating Process." In ASME 2021 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/imece2021-71880.

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Abstract Bioinspired Micro/Nano textured rough topography of a surface has many applications in super-hydrophobicity, self-cleaning surface, anti-icing coatings, anti-biofouling, and drag reduction surfaces. The role of hierarchical and complex surface topography in nature is to amplify the hydrophobicity and maximize the fouling resistance. Thus, a similar micro- and nano-scale 3-D topographic surfaces inspired from the nature were fabricated using a simple and scalable two roll coating process. This process was based on the ribbing instabilities associated with the shearing of non-Newtonian fluids between two rollers. The polymer composite retains the deformed shape due to the recovery of high-viscosity after removing the shear stress. The relationship between the process conditions and the textured structure were studied with the shear rate, capillary number and the surface roughness parameters (e.g., Wenzel factor and density of peaks). The results showed that the samples’ Wenzel roughness factor increased with the increase in shear rate up to a particular value and then decreased. Similarly, the density of peaks in the sample increased with an increase in capillary number up to a particular value and then decreased. These bioinspired surfaces with hierarchical textured patterns produced using two roll coating process show a tremendous potentiality to be used in super-hydrophobic, anti-biofouling, and drag reduction applications.
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Ardito, R., A. Corigliano, A. Frangi, L. Magagnin, and F. Rizzini. "COMPUTATION OF ADHESIVE FORCES DUE TO VAN DER WAALS AND CAPILLARY EFFECTS ON REALISTIC ROUGH SURFACES." In 10th World Congress on Computational Mechanics. São Paulo: Editora Edgard Blücher, 2014. http://dx.doi.org/10.5151/meceng-wccm2012-18863.

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Meng, Shuai, Zhen Zhao, Qian Wang, and Rui Yang. "Droplet Spreading on Textured Surface Based on SPH Method." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-62948.

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Droplet spreading occurs when a water drop hits the surfaces in a relatively low speed, which is a very important process in many applications (for example printing technologies and especially observation of diffusion of liquid state contaminant). This paper is aimed at analyzing contact angle and roughness, the two main factors’ effect on droplet spreading using SPH (smoothed particle hydrodynamics) method. When fluid-fluid and fluid-solid particle-particle interaction is added according to Alexandre Tartakovsky and Paul Meakin, surface tension and contact angle can be simulated. Line-shaped projections of different height are applied here as rough surfaces. The result shows two main effects of textured surface with different contact angle: unequal spreading in different direction and capillary phenomenon in the gap formed by the line-shaped projections.
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DelRio, Frank W., Maarten P. de Boer, Leslie M. Phinney, Chris J. Bourdon, and Martin L. Dunn. "Van der Waals and Capillary Adhesion of Microelectromechanical Systems." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-15169.

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Interfacial adhesion is an important factor in determining the performance and reliability of microelectromechanical systems (MEMS). Van der Waals dispersion forces are the dominant adhesion mechanism in the low relative humidity (RH) regime. At small roughness values, adhesion is mainly due to van der Waals dispersion forces acting across extensive non-contacting areas and is related to 1/Dave2, where Dave is the average surface separation. These contributions must be considered due to the close proximity of the surfaces, which is a result of the planar deposition technology. At large roughness values, van der Waals forces at contacting asperities become the dominating contributor to the adhesion. Capillary condensation of water has a significant effect on rough surface adhesion in the moderate to high RH regime. Above a threshold RH, which is a function of the surface roughness, the adhesion jumps due to meniscus formation at the interface and increases rapidly towards the upper limit of Γ=2 γcos θ=144 mJ/m2, where γ is the liquid surface energy and θ is the contact angle.
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Singer, Gabriela, Shouxiang Mark Ma, Songhua Chen, and Mahmoud Eid. "2D Surface Roughness Quantification for Enhanced Petrophysical Applications." In SPE Annual Technical Conference and Exhibition. SPE, 2022. http://dx.doi.org/10.2118/210178-ms.

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Abstract Surface roughness is an essential rock parameter affecting petrophysical properties that are surface sensitive such as characterization of pore structure and wettability. For instance, Wenzel's contact angle formula for rough surfaces requires knowledge of the surface roughness, and surface roughness is expected to speed up aging of cores in crude oil for wettability restoration. In addition, proper quantification of surface roughness is critical for obtaining representative, roughness-independent, pore sizes for applications such as prediction of permeability and interpretation of capillary pressure curves. Intuitively, a surface is better characterized in 2D than in 1D. This 2D study is a continuation and enhancement of the previous 1D work, recently published in the SPE Journal (Ma et al., 2021). In this current paper, a comprehensive investigation of 1D versus 2D surface roughness measurements is conducted to evaluate and cross validate the two approaches. In this study, surface roughness is measured on 26 carbonate rock samples by laser scanning confocal microscopy (LSCM), where both the 1D absolute increment surface roughness, Sr, as well as 2D interfacial area ratio of surface roughness, Sdr, are reported. As expected, results indicate that surface roughness characterized by 2D Sdr has a greater dynamic range than the 1D Sr measurement, i.e., the 2D Sdr provides a more representative characterization of surface roughness. A detailed account of methodologies, assumptions, limitations, validation and applications of the 1D and 2D surface roughness characterization is documented in this paper. To extract the roughness features present on rock grain surfaces, effects of de-spiking and filter length, used to eliminate pore size effects, are investigated. For specific applications of surface roughness corrected pore size estimation from nuclear magnetic resonance (NMR) measurements, differences in length-scales of surface roughness are compared between LSCM measurement and that derived from NMR diffusion-T2 plus BET surface area. The surface roughness-corrected NMR pore-size distribution is also validated against the pore-size distribution obtained from measurement of micro-CT scanning.
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Steigmann, David. "Coupled Deformations of Elastic Curves and Surfaces." In ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-1995.

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Abstract Theories of perfectly flexible elastic curves and surfaces are frequently used to describe diverse phenomena ranging from bioelasticity and fluid capillarity to rubber elasticity and the mechanics of structural networks. It is our aim here to present a treatment of the coupled response of such continua accounting for three-dimensional interactions in the presence of finite deformations and strains. A more expansive discussion of the subject of the present paper may be found in [1].
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Angelsky, Oleg V., Dimitry N. Burkovets, Alexander V. Kovalchuk, and Steen G. Hanson. "Fractal properties of rough surfaces." In 19th Congress of the International Commission for Optics: Optics for the Quality of Life, edited by Giancarlo C. Righini and Anna Consortini. SPIE, 2003. http://dx.doi.org/10.1117/12.526960.

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Angelsky, Oleg V., Alexander V. Kovalchuk, and Dimitry N. Burkovets. "Fractal description of rough surfaces." In Saratov Fall Meeting 2001, edited by Dmitry A. Zimnyakov. SPIE, 2002. http://dx.doi.org/10.1117/12.468999.

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Reports on the topic "Capillarity on rough surfaces"

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Dainty, J. C. Enhanced Backscattering from Rough Surfaces. Fort Belvoir, VA: Defense Technical Information Center, October 1987. http://dx.doi.org/10.21236/ada191089.

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Maradudin, A. A. Optical Interactions at Rough Surfaces. Fort Belvoir, VA: Defense Technical Information Center, May 1999. http://dx.doi.org/10.21236/ada378942.

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Dainty, J. C. Enhanced Backscattering from Rough Surfaces. Fort Belvoir, VA: Defense Technical Information Center, October 1991. http://dx.doi.org/10.21236/ada243437.

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DeSanto, John A. Approximation Methods for Scattering from Rough Surfaces. Fort Belvoir, VA: Defense Technical Information Center, March 1989. http://dx.doi.org/10.21236/ada209482.

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Maradudin, Alexei A. Diffraction of Light from Randomly Rough Surfaces. Fort Belvoir, VA: Defense Technical Information Center, March 1992. http://dx.doi.org/10.21236/ada250261.

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Davis, B. A., R. J. Adams, and G. S. Brown. Scattering from Rough Surfaces With a Vegetated Cover. Fort Belvoir, VA: Defense Technical Information Center, August 1999. http://dx.doi.org/10.21236/ada404969.

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Vesecky, John F., and Glenn A. Jensen. New Methods for Wave Scattering from Rough Surfaces. Fort Belvoir, VA: Defense Technical Information Center, September 1994. http://dx.doi.org/10.21236/ada288668.

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Theiler, J., and B. G. Henderson. A geometrical constraint on shadowing in rough surfaces. Office of Scientific and Technical Information (OSTI), October 1997. http://dx.doi.org/10.2172/532451.

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Bahar, Ezekiel. Light Scattering by Rough Surfaces Full Wave Solutions. Fort Belvoir, VA: Defense Technical Information Center, May 1986. http://dx.doi.org/10.21236/ada170371.

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Bickel, William S. Investigations of Polarized Light Scattering from Rough Surfaces. Fort Belvoir, VA: Defense Technical Information Center, November 1989. http://dx.doi.org/10.21236/ada221943.

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