Готові списки джерел за темами / Wetting ridge

Добірка наукової літератури з теми "Wetting ridge"

Автор: Grafiati

Опубліковано: 10 грудня 2022

Оновлено: 28 січня 2023

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Статті в журналах з теми "Wetting ridge"

Park, S. J., J. B. Bostwick, V. De Andrade, and J. H. Je. "Self-spreading of the wetting ridge during stick-slip on a viscoelastic surface." Soft Matter 13, no. 44 (2017): 8331–36. http://dx.doi.org/10.1039/c7sm01408b.

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Annakodi, Vivek Anand, Ramachandra Arvind Singh, Subramanian Jayalakshmi, Yupeng Zhang, Koppula Srinivas Rao, and Rajashekhara Shabadi. "Anticorrosion Behaviour of SS304 Microgroove Surfaces in Saline Water." Metals 11, no. 10 (September 28, 2021): 1543. http://dx.doi.org/10.3390/met11101543.

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The 304 Stainless Steel (SS304) is severely affected by salt water corrosion due to its high surface wettability. By reducing its surface wettability, its corrosion can be reduced. To achieve this, topographical modification of the steel surface is an effective route. In this work, SS304 flat surfaces were topographically modified into microgrooves (ridge width 250 μm to 500 μm, groove width 200 μm, width ratio = ridge width/groove width >1). Wire cut electrical discharge machining was used to fabricate the microgrooves. Long-term wetting characteristics and long-term corrosion behaviour of flat surface and microgrooves were studied. The influence of the nature of wetting of the tested surfaces on their corrosion behaviour was examined. The sessile drop method and potentiodynamic polarization tests in sodium chloride (3.5 wt. % NaCl) solution (intermittent and continuous exposures for 168 h) were studied to characterize their wetting and corrosion behaviours, respectively. Topographical modification imparted long-term hydrophobicity and, as a consequence, long-term anticorrosion ability of the steel surface. Micropatterning reduced the corrosion rate by two orders of magnitude due to reduction in interfacial contact area with the corrosive fluid via composite wetting, i.e., solid–liquid–air interface. Microgrooves showed corrosion inhibition efficiency ≥88%, upon long-term exposure to NaCl solution. By comparing the wetting and corrosion behaviours of the microgrooves with those of the previously studied microgrooves (ridge width/groove width <1), it was found that the surface roughness of their ridges strongly influences their wetting and corrosion properties.

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Кошоридзе, С. И. "Влияние диссипации энергии в подложке на время жизни поверхностных нанопузырьков". Письма в журнал технической физики 49, № 1 (2023): 14. http://dx.doi.org/10.21883/pjtf.2023.01.54050.19357.

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Based on the analogy between the process of spreading a liquid droplet on a hydrophobic surface and the diffusion dissolution of surface nanobubbles (SNB), the shape of the wetting ridge, deformed by capillary forces of the substrate surface area adjacent to the contact line of the three phases, is calculated within the framework of linear elasticity theory. It is shown that the energy dissipation in viscoelastic substrates on the wetting ridge can cause the pinning of the triple line and the termination of the diffusion dissolution of the SNB.

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Heyden, Stefanie, Nicolas Bain, Qin Xu, Robert W. Style, and Eric R. Dufresne. "Contact lines on stretched soft solids: modelling anisotropic surface stresses." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 477, no. 2245 (January 2021): 20200673. http://dx.doi.org/10.1098/rspa.2020.0673.

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We present fully analytical solutions for the deformation of a stretched soft substrate due to the static wetting of a large liquid droplet, and compare our solutions to recently published experiments (Xu et al. 2018 Soft Matter 14, 916–920 (doi:10.1039/C7SM02431B)). Following a Green’s function approach, we extend the surface-stress regularized Flamant–Cerruti problem to account for uniaxial pre-strains of the substrate. Surface profiles, including the heights and opening angles of wetting ridges, are provided for linearized and finite kinematics. We fit experimental wetting ridge shapes as a function of applied strain using two free parameters, the surface Lamé coefficients. In comparison with experiments, we find that observed opening angles are more accurately captured using finite kinematics, especially with increasing levels of applied pre-strain. These fits qualitatively agree with the results of Xu et al ., but revise values of the surface elastic constants.

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Carre, A., and M. E. R. Shanahan. "Influence of the "Wetting Ridge" in Dry Patch Formation." Langmuir 11, no. 9 (September 1995): 3572–75. http://dx.doi.org/10.1021/la00009a047.

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Semprebon, Ciro, Glen McHale, and Halim Kusumaatmaja. "Apparent contact angle and contact angle hysteresis on liquid infused surfaces." Soft Matter 13, no. 1 (2017): 101–10. http://dx.doi.org/10.1039/c6sm00920d.

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Choi, Jung Won, Daseul Ham, Seonghyun Han, Do Young Noh, and Hyon Chol Kang. "Nanoscale Soft Wetting Observed in Co/Sapphire during Pulsed Laser Irradiation." Nanomaterials 11, no. 2 (January 20, 2021): 268. http://dx.doi.org/10.3390/nano11020268.

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Liquid drops on deformable soft substrates exhibit quite complicated wetting behavior as compared to those on rigid solid substrates. We report on a soft wetting behavior of Co nanoparticles (NPs) on a sapphire substrate during pulsed laser-induced dewetting (PLID). Co NPs produced by PLID wetted the sapphire substrate with a contact angle near 70°, which is in contrast to typical dewetting behavior of metal thin films exhibiting contact angles greater than 90°. In addition, a nanoscale γ-Al2O3 wetting ridge about 15 nm in size and a thin amorphous Al2O3 interlayer were observed around and beneath the Co NP, respectively. The observed soft wetting behavior strongly indicates that the sapphire substrate became soft and deformable during PLID. Moreover, the soft wetting was augmented under PLID in air due to the formation of a CoO shell, resulting in a smaller contact angle near 30°.

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Rashidian, Hossein, Matheu Broom, Geoff R. Willmott та Mathieu Sellier. "Eﬀects of a microscale ridge on dynamic wetting during drop impact". Journal of the Royal Society of New Zealand 50, № 4 (22 січня 2020): 523–37. http://dx.doi.org/10.1080/03036758.2019.1706587.

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Surapaneni, Venkata A., Georg Bold, Thomas Speck, and Marc Thielen. "Spatio-temporal development of cuticular ridges on leaf surfaces of Hevea brasiliensis alters insect attachment." Royal Society Open Science 7, no. 11 (November 2020): 201319. http://dx.doi.org/10.1098/rsos.201319.

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Cuticular ridges on plant surfaces can control insect adhesion and wetting behaviour and might also offer stability to underlying cells during growth. The growth of the plant cuticle and its underlying cells possibly results in changes in the morphology of cuticular ridges and may also affect their function. We present spatial and temporal patterns in cuticular ridge development on the leaf surfaces of the model plant, Hevea brasiliensis . We have identified, by confocal laser scanning microscopy of polymer leaf replicas, an acropetally directed progression of ridges during the ontogeny of Hevea brasiliensis leaf surfaces. The use of Colorado potato beetles (Leptinotarsa decemlineata) as a model insect species has shown that the changing dimensions of cuticular ridges on plant leaves during ontogeny have a significant impact on insect traction forces and act as an effective indirect defence mechanism. The traction forces of walking insects are significantly lower on mature leaf surfaces compared with young leaf surfaces. The measured walking traction forces exhibit a strong negative correlation with the dimensions of the cuticular ridges.

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Kim, T. H., J. Seo, J. Choi, B. Y. Choi, Y. J. Song, Y. Kuk, and S. J. Kahng. "Strain-relieving ridge structure in a wetting layer on the W(110) surface." Surface Science 595, no. 1-3 (December 2005): 30–34. http://dx.doi.org/10.1016/j.susc.2005.07.034.

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Тези доповідей конференцій з теми "Wetting ridge"

Herescu, Alexandru, and Jeffrey S. Allen. "Implications of Contact Line Dynamics on Taylor Bubble Flow Morphology." In ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels collocated with 3rd Joint US-European Fluids Engineering Summer Meeting. ASMEDC, 2010. http://dx.doi.org/10.1115/fedsm-icnmm2010-30911.

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Film deposition experiments are performed in circular glass capillaries of 500 μm diameter. Two surface wettabilities are considered, contact angle of 30° for water on glass and of 105° when a hydrophobic coating is applied. It was observed that the liquid film deposited as the meniscus translates with a velocity U presents a ridge that also moves in the direction of the flow. The ridge is bounded by a contact line moving at a velocity UCL as well as a front of velocity UF, and it translates over the deposited stagnant film. The behavior of the ridge presents striking dissimilarities when the wettability is changed. Both UCL and UF are approximately twice as large for the non-wetting case at the same capillary number Ca. The Taylor bubbles forming due to the growth of the ridge are also differentiated by wettability, being much shorter in the non-wetting case. The dynamics of the contact line is studied experimentally and a criterion is proposed to explain the occurrence of a shock at the advancing front of the ridge. The hydraulic jump cannot be explained by the Froude condition of shock formation in shallow waters, or by an inertial dewetting of the deposited film. For a dynamic contact angle of θd = 6° and according to the proposed criterion, a hydraulic jump forms at the front of the ridge when a critical velocity is reached.

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Wendel, Mark, Ashraf Ibrahim, David Felde, and Bernard Riemer. "Gas Bubble Formation in Stagnant and Flowing Mercury." In ASME/JSME 2007 5th Joint Fluids Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/fedsm2007-37435.

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The Oak Ridge National Laboratory’s (ORNL) Spallation Neutron Source (SNS) facility uses a liquid mercury target that flows through a stainless steel containment vessel. As the SNS pulsed beam power level is increased, it is expected that the target vessel lifetime could become limited by cavitation damage erosion (CDE). Bubbles produced in mercury at an upwards-oriented vertical gas injector needle were observed with proton radiography (pRad) at the Los Alamos Neutron Science Center (LANSCE). The comparison of volume-of-fluid (VOF) simulation results to the radiographic images reveals some aspects of success and some deficiencies in predicting these high surface tension, highly buoyant, and non-wetting fluid behavior. Although several gas flows were measured with pRad, this paper focuses on the case with a low gas flow rate of 1.66 mg/min (10 sccm) through the 0.2-mm-outer-diameter injector needle. The acoustic waves emitted due to the detachment of the bubble and during subsequent bubble oscillations were also recorded with a microphone, providing a precise measurement of the bubble sizes. When the mercury is also motivated coaxially, the drag on the bubble forces earlier detachment leading to smaller bubble sizes.

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Wendel, Mark, Ashraf Abdou, Vincent Paquit, David Felde, and Bernard Riemer. "Creating Small Gas Bubbles in Flowing Mercury Using Turbulence at an Orifice." In ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting collocated with 8th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2010. http://dx.doi.org/10.1115/fedsm-icnmm2010-30134.

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Pressure waves created in liquid mercury pulsed spallation targets have been shown to create cavitation damage to the target container. One way to mitigate such damage would be to absorb the pressure pulse energy into a dispersed population of small bubbles, however, creating such a population in mercury is difficult due to the high surface tension and particularly the non-wetting behavior of mercury on gas-injection hardware. If the larger injected gas bubbles can be broken down into small bubbles after they are introduced to the flow, then the material interface problem is avoided. Research at the Oak Ridge National Labarotory is underway to develop a technique that has shown potential to provide an adequate population of small-enough bubbles to a flowing spallation target. This technique involves gas injection at an orifice of a geometry that is optimized to the turbulence intensity and pressure distribution of the flow, while avoiding coalescence of gas at injection sites. The most successful geometry thus far can be described as a square-toothed orifice having a 2.5 bar pressure drop in the mercury flow of 8 L/s for one of the target inlet legs. High-speed video and high-resolution photography have been used to quantify the bubble population on the surface of the mercury downstream of the gas injection site. Also, computational fluid dynamics has been used to optimize the dimensions of the toothed orifice based on a RANS computed mean flow including turbulent energies such that the turbulent dissipation and pressure field are best suited for turbulent break-up of the gas bubbles.

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Steigerwalt Lam, Lisa, and Yuri Muzychka. "Slip in the Presence of Semi-Circular Menisci Between Parallel Ridges." In ASME 2020 18th International Conference on Nanochannels, Microchannels, and Minichannels collocated with the ASME 2020 Heat Transfer Summer Conference and the ASME 2020 Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/icnmm2020-1074.

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Abstract Surfaces which are structured on the micro- and nanoscale to resist wetting are being considered for internal flows due to their drag reducing properties in applications such as electronics cooling and lab-on-chip. Here, an expression is developed to characterize the hydrodynamic slip in a laminar flow which occurs near the surface for the case when positive meniscus curvature is present. The surfaces considered are composed of ridges oriented parallel to the flow. Curvature of the meniscus, which resides between the liquid in the Cassie state and the gas trapped in cavities between the ridges, results from the pressure difference between the liquid and the gas. The meniscus is considered shear free. The no slip condition exists at the tips of the ridges. Conformal maps from the literature are used to derive an expression which is a function of cavity fraction of the surface. The positive protrusion angle is 90 degrees. Cavity fractions range from 0 to 75%.

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Mora, Peter, Gabriele Morra, Dave Yuen, and Ruben Juanes. "Study of the Effect of Wetting on Viscous Fingering Before and After Breakthrough by Lattice Boltzmann Simulations." In SPE Middle East Oil & Gas Show and Conference. SPE, 2021. http://dx.doi.org/10.2118/204536-ms.

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Abstract We present a suite of numerical simulations of two-phase flow through a 2D model of a porous medium using the Rothman-Keller Lattice Boltzmann Method to study the effect of viscous fingering on the recovery factor as a function of viscosity ratio and wetting angle. This suite involves simulations spanning wetting angles from non-wetting to perfectly wetting and viscosity ratios spanning from 0.01 through 100. Each simulation is initialized with a porous model that is fully saturated with a "blue" fluid, and a "red" fluid is then injected from the left. The simulation parameters are set such that the capillary number is 10, well above the threshold for viscous fingering, and with a Reynolds number of 0.2 which is well below the transition to turbulence and small enough such that inertial effects are negligible. Each simulation involves the "red" fluid being injected from the left at a constant rate such in accord with the specified capillary number and Reynolds number until the red fluid breaks through the right side of the model. As expected, the dominant effect is the viscosity ratio, with narrow tendrils (viscous fingering) occurring for small viscosity ratios with M ≪ 1, and an almost linear front occurring for viscosity ratios above unity. The wetting angle is found to have a more subtle and complicated role. For low wetting angles (highly wetting injected fluids), the finger morphology is more rounded whereas for high wetting angles, the fingers become narrow. The effect of wettability on saturation (recovery factor) is more complex than the expected increase in recovery factor as the wetting angle is decreased, with specific wetting angles at certain viscosity ratios that optimize yield. This complex phase space landscape with hills, valleys and ridges suggests the dynamics of flow has a complex relationship with the geometry of the medium and hydrodynamical parameters, and hence recovery factors. This kind of behavior potentially has immense significance to Enhanced Oil Recovery (EOR). For the case of low viscosity ratio, the flow after breakthrough is localized mainly through narrow fingers but these evolve and broaden and the saturation continues to increase albeit at a reduced rate. For this reason, the recovery factor continues to increase after breakthrough and approaches over 90% after 10 times the breakthrough time.

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Xu, Jing, and Jun Chen. "Characterization of the Anisotropic Wetting Property in Liquid Transportation on the Surface With Ratchet Structures." In ASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ajkfluids2019-5085.

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Abstract In this paper, the samples with ratchet structures surface, are set vertically and horizontally in the liquid transportation experiments. Both static and dynamic directional property has been recorded by a high-speed camera. The variation of static contact angles and the shape of the drop in a ratchet structure are measured. The geometric evolutions of drop shed off along different direction on ratchet structure surface and the smooth surface under dynamic condition, are observed for comparison. The advancing contact angle and velocity of drop shed off the ratchet structure are analyzed in detail. The directional liquid transportation mechanism of anisotropic wettability property is demonstrated. Results show that the static drop moves parallel along ridges quickly, and the tooth limit the anisotropic drop spread to the other teeth along the vertical direction, this anisotropic wettability behavior in ratchet structure, which is related to the velocity of liquid transport, the velocity of liquid drop along the backward direction is slower than that of forward direction. The anisotropic wettability property along the horizontal direction of groove limits the transportation ability of the drop. The observed drop deformation includes rotating, rolling, and shaking-induced movements. The surface tension, adhesive behavior, and curvature difference cause the hysteresis effect, which presents a major barrier for liquid transportation.

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