Relevant bibliographies by topics / Contact angle

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Contact angle'

Author: Grafiati
Published: 4 June 2021
Last updated: 27 July 2024

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Journal articles on the topic "Contact angle"

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Marmur, Abraham. "Contact angle equilibrium: the intrinsic contact angle." Journal of Adhesion Science and Technology 6, no. 6 (January 1992): 689–701. http://dx.doi.org/10.1163/156856192x01042.

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Kwok, D. Y., and A. W. Neumann. "Contact angle measurement and contact angle interpretation." Advances in Colloid and Interface Science 81, no. 3 (September 1999): 167–249. http://dx.doi.org/10.1016/s0001-8686(98)00087-6.

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Yang, S. Y., G. J. Hirasaki, S. Basu, and R. Vaidya. "Mechanisms for contact angle hysteresis and advancing contact angles." Journal of Petroleum Science and Engineering 24, no. 2-4 (December 1999): 63–73. http://dx.doi.org/10.1016/s0920-4105(99)00049-2.

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Wang, J. H., P. M. Claesson, J. L. Parker, and H. Yasuda. "Dynamic Contact Angles and Contact Angle Hysteresis of Plasma Polymers." Langmuir 10, no. 10 (October 1994): 3887–97. http://dx.doi.org/10.1021/la00022a080.

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Ruiz-Cabello, F. J. Montes, M. A. Rodríguez-Valverde, and M. A. Cabrerizo-Vílchez. "Equilibrium contact angle or the most-stable contact angle?" Advances in Colloid and Interface Science 206 (April 2014): 320–27. http://dx.doi.org/10.1016/j.cis.2013.09.003.

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Chen, Yongjiang, and Wencheng Tang. "Determination of contact stiffness in ball screws considering variable contact angles." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 228, no. 12 (January 7, 2014): 2193–203. http://dx.doi.org/10.1177/0954406213516304.

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The contact angles formed at the position of each ball in ball screws are conventionally assumed to be a constant value in determination of contact stiffness. In this study, instead of being treated as pre-assumed constants, the contact angle is formulated as functions of the position angle of balls to reflect their distribution dependent on the operation condition and design parameters. After establishing a proper transformed coordinate system according to the ball screw mechanism, the variable contact angles and normal forces of the ball screw are predicted. Then the contact stiffness obtained by numerical calculations is validated by experiment and several characteristics arising from the variable contact angle will be discussed.
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Butt, Hans-Jürgen, Jie Liu, Kaloian Koynov, Benedikt Straub, Chirag Hinduja, Ilia Roismann, Rüdiger Berger, et al. "Contact angle hysteresis." Current Opinion in Colloid & Interface Science 59 (June 2022): 101574. http://dx.doi.org/10.1016/j.cocis.2022.101574.

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Liu, Yong-Ming, Zi-Qing Wu, Sheng Bao, Wei-Hong Guo, Da-Wei Li, Jin He, Xiang-Bin Zeng, et al. "The Possibility of Changing the Wettability of Material Surface by Adjusting Gravity." Research 2020 (January 27, 2020): 1–11. http://dx.doi.org/10.34133/2020/2640834.

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The contact angle, as a vital measured parameter of wettability of material surface, has long been in dispute whether it is affected by gravity. Herein, we measured the advancing and receding contact angles on extremely low contact angle hysteresis surfaces under different gravities (1-8G) and found that both of them decrease with the increase of the gravity. The underlying mechanism is revealed to be the contact angle hysteresis and the deformation of the liquid-vapor interface away from the solid surface caused by gradient distribution of the hydrostatic pressure. The real contact angle is not affected by gravity and cannot measured by an optical method. The measured apparent contact angles are angles of inclination of the liquid-vapor interface away from the solid surface. Furthermore, a new equation is proposed based on the balance of forces acting on the three-phase contact region, which quantitatively reveals the relation of the apparent contact angle with the interfacial tensions and gravity. This finding can provide new horizons for solving the debate on whether gravity affects the contact angle and may be useful for the accurate measurement of the contact angle and the development of a new contact angle measurement system.
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Kwok, D. Y., and A. W. Neumann. "Contact angle interpretation: re-evaluation of existing contact angle data." Colloids and Surfaces A: Physicochemical and Engineering Aspects 161, no. 1 (January 2000): 49–62. http://dx.doi.org/10.1016/s0927-7757(99)00324-6.

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Lyashenko, Iakov A., Valentin L. Popov, and Vadym Borysiuk. "Indentation and Detachment in Adhesive Contacts between Soft Elastomer and Rigid Indenter at Simultaneous Motion in Normal and Tangential Direction: Experiments and Simulations." Biomimetics 8, no. 6 (October 7, 2023): 477. http://dx.doi.org/10.3390/biomimetics8060477.

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In reported experiments, a steel indenter was pressed into a soft elastomer layer under varying inclination angles and subsequently was detached under various inclination angles too. The processes of indentation and detachment were recorded with a video camera, and the time dependences of the normal and tangential components of the contact force and the contact area, as well as the average contact pressure and average tangential stresses, were measured as functions of the inclination angle. Based on experimental results, a simple theoretical model of the indentation process is proposed, in which tangential and normal contacts are considered independently. Both experimental and theoretical results show that at small indentation angles (when the direction of motion is close to tangential), a mode with elastomer slippage relative to the indenter is observed, which leads to complex dynamic processes—the rearrangement of the contact boundary and the propagation of elastic waves (similar to Schallamach waves). If the angle is close to the normal angle, there is no slipping in the contact plane during the entire indentation (detachment) phase.
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Dissertations / Theses on the topic "Contact angle"

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Lam, C. N. Catherine. "A study of advancing & receding contact angles and contact angle hysteresis." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ58840.pdf.

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He, Ying Bin. "Contact angle measurements on fine coal particles." Thesis, University of British Columbia, 1989. http://hdl.handle.net/2429/27882.

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This study investigates the techniques of contact angle measurement on fine coal particles. Two techniques, one direct and one indirect, have been investigated and modified. In the direct contact angle measurement technique, high pressure is employed to compress the coal powder into a pellet and the artificial surface of the pellet is employed in the contact angle measurements. The contact angle versus time and versus drop size on the pellet surface are examined. In addition, the pellet properties and factors affecting the pellet properties are also studied. A pellet surface model and a method for contact angle correction are proposed. In the indirect measurement, the contact angle is calculated from the penetration rate. The method is modified to employ high pressures to produce highly compact columns. The holding glass tube traditionally used for the column of powder is, therefore, no longer needed. The change in penetration behaviour of the liquid within such columns is investigated. The properties of the columns and the impact of the pressure applied in their formation on the rate of liquid penetration as well as other phenomena are studied. A contact angle calculation procedure is also proposed.
Applied Science, Faculty of
Mining Engineering, Keevil Institute of
Graduate
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Hatipogullari, Metin. "Modelling of contact lines on heterogeneous substrates :stick-slip and contact angle hysteresis." Doctoral thesis, Universite Libre de Bruxelles, 2020. https://dipot.ulb.ac.be/dspace/bitstream/2013/304847/5/contratMH.pdf.

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This thesis highlights generic aspects of contact angle hysteresis and stick-slip motion,encountered in most practical wetting situations.First, we study the scaling relation between the heterogeneity strength and the amplitudeof the contact angle hysteresis it induces in the model configuration of a chemicallyheterogeneous microchannel. A key parameter which determines the qualitativefeatures is the heterogeneity wavelength. In particular, we identify a near-thresholdbehavior where the quadratic scaling between the heterogeneity amplitude and the resultinghysteresis, already known for a dilute system of wetting defects, is explainedby the closeness to the threshold, and a macroscopic limit without observable stick-slipwhere this scaling is linear.In the second part, we adapt the description to the configuration of a meniscusaround a wavy fibre. This adaptation brings the generic results of the first part in thereach of experiments. A comparison with experiments is achieved at the level of theindividual topography-induced jumps.In the third part, we expand the formulation to treat the quasi-steady interface shapecontact line dynamics and study how the the presence of stick-slip motion at the observableor unobservable scale modifies the scaling relation between the contact linevelocity and contact angle. We recover the known result that the scaling exponent dependson the nature of the externally controlled parameter, identify the causes of thisdependency in the corresponding static limits, and predict the disappearance of this dependencyabove a critical velocity which decreases with the heterogeneity wavelength.Finally, we show trough examples how the modelling framework which permitscapturing contact angle hysteresis and stick-slip motion in a minimalistic way can beadopted to treat configurations with a finite amount of contact points, or the 3D problemof a drop with a deformed contact line. We discuss the arising configuration-specificeffects, also in configurations of biomimetic interest.
Doctorat en Sciences de l'ingénieur et technologie
info:eu-repo/semantics/nonPublished
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Burel, Thomas. "Investigation of smooth contact angle treatment in porous media." Thesis, University of Strathclyde, 2018. http://digitool.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=30826.

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Some of the key challenges faced in the oil/gas extraction and carbon dioxide injection/storage processes are the presence of complex geometries and the significant effect of the capillary forces which arise at low capillary numbers. Therefore, the contact angle needs to be carefully treated. Mesoscopic techniques such as lattice Boltzmann methods are capable of dealing with lower capillary numbers as compared to the Navier-Stokes solvers, which can also implicitly capture the interface between two fluids. To investigate immiscible two-phase ows at low Reynolds and capillary numbers (Re < 1 and Ca < 1), the colour-fluid model is used i.e. the Rothman-Keller model [1]. This model includes two steps: a perturbation operator from Lishchuk et al [2] (the continuum surface force [3]) or Gunstensen et al [4] approaches and a recolouring operator [5]. However, the lattice Boltzmann implementation employs a Cartesian grid for domain discretisation that is unable to conform with curved surfaces. It misinterprets those curved surfaces as a series of stair-like patterns. On those surfaces, a non-physical contact angle could be defined which may lead to a numerically flooding of the wetting fluid inside the droplet for a non-spreading drop or outside for a spreading droplet. To remove this unphysical behaviour and take into account the flow field effect on the contact angle, interpolation techniques are employed to estimate the real contact angle on the 'stairs' boundaries. We also employ extrapolations to obtain more accurate density on concave corners, thus the grid resolution can be reduced. After the code is numerically validated on static droplets, on droplets deformed under a simple shear, and on simple geometries. Finally, we perform simulations on a Berea sandstone sample [6] to understand dynamics behaviour of immiscible fluids in porous media.
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Vijayan, Ria. "Wheel-terrain contact angle estimation for planetary exploration rovers." Thesis, Luleå tekniska universitet, Rymdteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-70676.

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During space missions, real time tele-operation of a rover is not practical because of significant signal latencies associated with inter planetary distances, making some degree of autonomy in rover control desirable. One of the challenges to achieving autonomy is the determination of terrain traversability. As part of this field, the determination of motion state of a rover on rough terrain via the estimation of wheel-terrain contact angles is proposed. This thesis investigates the feasibility of estimating the contact angles from the kinematics of the rover system and measurements from the onboard inertial measurement unit (IMU), joint angle sensors and wheel encoders. This approach does not rely on any knowledge of the terrain geometry or terrain mechanical properties. An existing framework of rover velocity and wheel slip estimation for flat terrain has been extended to additionally estimate the wheel-terrain contact angle along with a side slip angle for each individual wheel, for rough terrain drive. A random walk and a damped model are used to describe the evolution of the contact angle and side slip angle over an unknown terrain. A standard strapdown algorithm for the estimation of attitude and velocity from IMU measurements, is modified to incorporate the 3D kinematics of the rover in the implementation of a nonlinear Kalman filter to estimate the motion states. The estimation results from the filter are verified using tests performed on the ExoMars BB2. The obtained contact angle estimates are found to be consistent with the reference values.
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Gujjula, Sushrutha Reddy. "Numerical Investigation of Droplet Spread: Effect of Contact Angle Models." University of Cincinnati / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1460447092.

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Ritchie, John. "Contact Angle Of A Nano-Drop On A Heterogeneous Surface." VCU Scholars Compass, 2010. http://scholarscompass.vcu.edu/etd/174.

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CONTACT ANGLE OF A NANO-DROP ON A HETEROGENEOUS SURFACE By John Andre Ritchie, Master of Science A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science at Virginia Commonwealth University Virginia Commonwealth University, 2010 Major Director: Dr. Alenka Luzar, Professor of Chemistry We examine the relation between contact angle of a nanodrop of water and the location of surface-water interaction energy at the perimeter and beneath the drop. Young’s equations gives the relationship between surface tension, at the three phase solid liquid vapor interface, and contact angle on a homogeneous surface. Cassie and Baxter generalized this equation to heterogeneous surfaces implying that contact angle corresponds to the average properties of the surface under the drop. McCarthy and coworkers pointed out it is the nature of the substrate at droplet perimeter that controls contact angle. And more recently, McHale in his theoretical derivation applies the Cassie-Baxter equation to the area at the drop’s perimeter. For a nanodrop, the situation is further complicated by the finite range of water-substrate interactions making the definition of the perimeter region somewhat arbitrary. We simulate nanodroplets of water on graphene-like surfaces having hydrophobic and hydrophilic interaction energy at the perimeter and beneath the drop using molecular dynamics. The microscopic analogue of the contact angle was extracted from simulation trajectory data. We confirm the contact angle is exclusively related to the surface interaction energy in the region of the drop’s perimeter. We test the role of finite range of substrate-water interaction when the area of a circular hydrophilic patch beneath the drop’s core is incrementally expanded until the contact angle is equivalent to that on the pure hydrophilic surface. We identify a range of interaction corresponding to a considerable drop in θ when plotting contact angle as a function of patch size. We show the observed contact angle dependence on the size of the patch can be predicted by the Cassie-Baxter mixing relation when limited to the area within the interaction range from the drop’s perimeter.
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Sasges, Michael R. "The effect of gravity on fluid configuration and contact angle hysteresis." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ27716.pdf.

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Moon, Jungun. "Effect of contact-release angle on hand-handrim for peak velocity." Virtual Press, 1992. http://liblink.bsu.edu/uhtbin/catkey/834622.

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The purpose of this study was to investigate the relationships between the arm joint angle at contact-release with peak velocity in experienced cerebral palsied athletes during wheelchair propulsion. The subjects (n = 5) exercised for a few minutes to familiarize themselves with the roller set up. After practice, each subject was asked to push the wheelchair as fast as possible up to 10 seconds. A tach-generator was attached to the core of the roller and interfaced to a computer via an eight bit A/D converter. The sampling rate of the roller speed was 200Hz. One video camera operating at 30 frames per second, and posisioned 7 m from the roller side was used. The data were analyzed for shoulder, elbow, and wrist angles with the Peak Performance program in I.B.M. compatible computer. Subjects' peak velocities were 8.85, 4.49, 4.19, 3.66, and 4.09 m/s, and the mean percent of contact and release times were 32.8% vs 67.2%. Shoulder, elbow, and wrist contact angles were not statisticaly in this study. Results indicate that contact-release angle on hand-handrim was effected for peak velocity. Also there was no significantrelationship between speed and cycle time.Key WordsRacing wheelchair, cerebral palsy, Peak velocity, Propulsion, Joint angle.
School of Physical Education
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Dakpanon, Yaï Laurent. "Contributions expérimentale et théorique à l'identification de paramètres adéquats pour la modélisation de la mouillabilité en ingénierie." Vandoeuvre-les-Nancy, INPL, 2002. http://www.theses.fr/2002INPL103N.

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Ce travail, essentiellement expérimental, s'inscrit dans le cadre des travaux de modélisation mathématique de l'équipe; ceux ci cherchent à identifier des paramètres susceptibles de caractériser les propriétés de mouillabilité d'un support solide par un liquide, lesquelles dépendent du fluide environnant. Le premier résultat de cette étude est la validation de deux corrélations admissibles entre le volume d'une goutte sessile axisymétrique (contrôlé de façon incrémentale et quasi- statique), et l'aire (mesurée) de la surface mouillée associée; ceci tout au long d'un cycle manifestant un phénomène d'hystérésis. Le deuxième apport de ce travail est l'élaboration d'une loi implicite de corrélation entre le volurne de la goutte et l'angle de contact. Enfin la réduction dimensionnelle du modèle de base et des lois de corrélation précédentes, par la longueur caractéristique "Volume/ Aire Mouillée", permet de mettre en évidence une courbe remarquable; Celle ci est monotone très régulière et représente à elle seule tous les états possibles (avancée, palier, retrait) du cycle d'hystérésis. Cette courbe, qualifiée de "Maîtresse" pour le comportement "Mouillabilité", reste à interpréter
The purpose of this work consists in identifying parameters able to characterize wetting properties of a solid sample by a liquid, in the presence of an other fluid. The first result of our study is the validation of two admissible correlation laws between the controlled volume of a sessile, axisymmetrical drop; and the corresponding measured wetted area. The second contribution of this research is the working out of an implicit correlation law between the drop volume and the contact angle. Finally, the dimensional reduction (of the basic model and the previous correlation laws) by the characteristic length "Volume/Wetting Area" allows to point out a remarkable curve; this last one, very regular, is monotone; it represents alone all the possible, states of the hysteresis cycle. This curve, qualified of "Master Curve" in order to explicit the wetting behaviour, has still to be interpreted
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Books on the topic "Contact angle"

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International Symposium on Contact Angle, Wettability and Adhesion (2nd 2000 Newark, N.J.). Contact angle, wettability & adhesion. Edited by Mittal K. L. 1945-. Utrecht: VSP, 2002.

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Lam, C. N. Catherine. A study of advancing & receding contact angles and contact angle hysteresis. Ottawa: National Library of Canada, 2001.

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1945-, Mittal K. L., ed. Contact angle, wettability and adhesion. Leiden: VSP, 2006.

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Mittal, K. L., ed. Advances in Contact Angle, Wettability and Adhesion. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119117018.

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Mittal, K. L., ed. Advances in Contact Angle, Wettability and Adhesion. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118795620.

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Mittal, K. L., ed. Advances in Contact Angle, Wettability and Adhesion. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2018. http://dx.doi.org/10.1002/9781119459996.

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Tennant, Cathy. Pyrrhotite floatability studies by contact angle measurements. Sudbury, Ont: Laurentian University, School of Engineering, 2001.

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Sasges, Michael R. The effect of gravity on fluid configuration and contact angle hysteresis. Ottawa: National Library of Canada = Bibliothèque nationale du Canada, 1997.

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International Symposium on Contact Angle, Wettability and Adhesion (1st 1992 San Francisco, Calif.). Contact angle, wettability and adhesion: Festschrift in honor of Professor Robert J. Good. Edited by American Chemical Society. Division of Colloid and Surface Chemistry. Utrecht, The Netherlands: VSP, 1993.

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F, Chao David, and NASA Glenn Research Center, eds. A new approach to measure contact angle and evaporation rate with flow visualization in a sessile drop. [Cleveland, Ohio]: National Aeronautics and Space Administration, Glenn Research Center, 1999.

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Book chapters on the topic "Contact angle"

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Gooch, Jan W. "Contact Angle." In Encyclopedic Dictionary of Polymers, 168. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_2860.

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Tadros, Tharwat. "Contact Angle." In Encyclopedia of Colloid and Interface Science, 147. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-20665-8_55.

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Gooch, Jan W. "Angle of Contact." In Encyclopedic Dictionary of Polymers, 39. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_619.

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Fopp-Spori, Doris M., and Pierre Martin-Tanchereau. "Contact angle measurements." In Biofouling Methods, 317–31. Oxford, UK: John Wiley & Sons, Ltd, 2014. http://dx.doi.org/10.1002/9781118336144.ch11.

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Finn, Robert. "The Capillary Contact Angle." In Grundlehren der mathematischen Wissenschaften, 212–33. New York, NY: Springer New York, 1986. http://dx.doi.org/10.1007/978-1-4613-8584-4_8.

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Wang, Jiadao. "Liquid Contact Angle Measurement." In Encyclopedia of Tribology, 1989–94. Boston, MA: Springer US, 2013. http://dx.doi.org/10.1007/978-0-387-92897-5_475.

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Rao, S. Ramachandra. "Hydrophobicity and Contact Angle." In Surface Chemistry of Froth Flotation, 351–84. Boston, MA: Springer US, 2004. http://dx.doi.org/10.1007/978-1-4757-4302-9_8.

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Rao, S. Ramachandra. "Hydrophobicity and Contact Angle." In Surface Chemistry of Froth Flotation, 351–84. Boston, MA: Springer US, 2004. http://dx.doi.org/10.1007/978-1-4419-9124-9_8.

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Yuan, Yuehua, and T. Randall Lee. "Contact Angle and Wetting Properties." In Surface Science Techniques, 3–34. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-34243-1_1.

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Langbein, Dieter. "Interface Tension and Contact Angle." In Springer Tracts in Modern Physics, 21–39. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/3-540-45267-2_2.

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Conference papers on the topic "Contact angle"

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Ni, Qi, Timo Marschke, Samuel Steele, Najafi Seyed, and Nathan B. Crane. "Studying of Contact Angle Friction and Contact Angle Hysteresis (CAH) Though Force Measurements." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-89869.

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A novel method of measuring contact line friction and contact angle hysteresis is described. In this method, a droplet is constrained between two surfaces while the surface of interest initiates motion. The results are compared to conventional characterization methods such as measuring the angle of inclined plane for droplet motion and measuring advancing and receding contact angles by infusing/withdrawing liquid from the substrate. At slow speeds, the proposed method provides a measure of the hysteresis but can also capture information about the contact line friction and viscous affects. Droplet force dependence on droplet size (height/width) is also investigated.
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Laga, Ekaterina, and Sergey Borovikov. "Dynamic contact angles and contact angle hysteresis on laser-textured aluminum alloy surfaces." In THERMOPHYSICAL BASIS OF ENERGY TECHNOLOGIES (TBET 2020). AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0047327.

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Field, Brandon S. "Visualization of Dynamic Contact Angle." In ASME 2013 Heat Transfer Summer Conference collocated with the ASME 2013 7th International Conference on Energy Sustainability and the ASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/ht2013-17512.

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Capillary rise of air-water-solid systems have been recorded with high-speed video. Glass and metal have been used as the solid phase, and the dynamic shape of the meniscus and contact angle have been characterized. The advancing and receding contact angle is of interest in computational simulations of boiling flow, and the present visualizations attempt to quantify the dynamic aspects of contact line motion. The centroid of the capillary meniscus has been tracked in order to determine the force at the contact line based on a force balance of the elevated fluid phase. The solid phase is raised and lowered in the fluid at different rates to observe advancing and receding contact lines.
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Kukielka, L., J. Chodor, and B. Storch. "New method of determination of the tool rake angle on the basis of the crack angle of the specimen in tensile tests and numerical simulations." In CONTACT/SURFACE 2009. Southampton, UK: WIT Press, 2009. http://dx.doi.org/10.2495/secm090191.

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Vafaei, Saeid, Dongsheng Wen, Ganapathiraman Ramanath, and Theodorian Borca-Tasciuc. "Surface Wettability Through Asymptotic Contact Angle." In ASME 2009 Fluids Engineering Division Summer Meeting. ASMEDC, 2009. http://dx.doi.org/10.1115/fedsm2009-78361.

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The purpose of this investigation is to find a unique and accurate criterion to measure surface wettability. The asymptotic contact angle (droplet contact angle in no gravity condition), which is independent of droplet size, is used to identify the surface wettability in this work. The asymptotic contact angle is calculated by equating the normal component of interfacial force on an axisymmetric droplet and spherical droplet. The effect of 2.5 nm bismuth telluride nanoparticles on surface wettability is measured and evaluated by asymptotic contact angles as a sample. This paper also studies the effects of nanoparticles on solid, gas and liquid interactions at the triple line as well as the gas-liquid surface tension of aqueous solutions of 2.5 nm bismuth telluride nanoparticles functionalized with thioglycolic acid. Experimental measurements of nanofluid droplet shapes show that the contact angle strongly depends on nanoparticle concentrations. Fitting the droplet shape with predictions of the Laplace-Young equation, the nanofluid gas-liquid surface tension is determined.
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Marquez, Izabel B., and Joseph Kalman. "Dynamic Contact Angle Measurements Using LabRam." In AIAA SCITECH 2023 Forum. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2023. http://dx.doi.org/10.2514/6.2023-2558.

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Hong, Fangjun, Ping Cheng, Zhen Sun, and Huiying Wu. "Simulation of Spreading Dynamics of a EWOD Droplet With Dynamic Contact Angle and Contact Angle Hysteresis." In ASME 2009 Second International Conference on Micro/Nanoscale Heat and Mass Transfer. ASMEDC, 2009. http://dx.doi.org/10.1115/mnhmt2009-18558.

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In this paper, the electrowetting dynamics of a droplet on a dielectric surface was investigated numerically by a mathematical model including dynamic contact angle and contact angle hysteresis. The fluid flow is described by laminar N-S equation, the free surface of the droplet is modeled by the Volume of Fluid (VOF) method, and the electrowetting force is incorporated by exerting an electrical force on the cells at the contact line. The Kilster’s model that can deal with both receding and advancing contact angle is adopted. Numerical results indicate that there is overshooting and oscillation of contact radius in droplet spreading process before it ceases the movement when the excitation voltage is high; while the overshooting is not observed for low voltage. The explanation for the contact line overshooting and some special characteristics of variation of contact radius with time were also conducted.
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Houdková, Š., F. Zahálka, and M. Kašparová. "The influence of the spraying angle on properties of thermally sprayed HVOF cermet coatings." In CONTACT/SURFACE 2009. Southampton, UK: WIT Press, 2009. http://dx.doi.org/10.2495/secm090061.

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Scholz, Daniel, and Paul Simutis. "Understanding interfaces: Using contact angle measurements to determine surface tension, interfacial tension, and kinetic properties from contact angle hysteresis." In 2022 AOCS Annual Meeting & Expo. American Oil Chemists' Society (AOCS), 2022. http://dx.doi.org/10.21748/tjyy3220.

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When there is an interface between a liquid and a solid, the angle between the surface of the liquid and the baseline of the contact surface is described as the contact angle. The contact angle is a measure of the wettability of a solid by a liquid. Measurement of the contact angle helps in all situations where solids and liquids meet and there is benefit gained by control of wetting and adhesion properties. Applications where contact angle values are especially important include development of hydrophobic or hydrophilic surface coatings, paints and varnishes, cleaning agents, printing processes, and more. Contact angle goniometers are high-precision video camera-based devices which perform the optical analysis of the shape of liquid drops placed on a solid surface (sessile drop method) or the shape of drops that hang down from a dosing needle (pendant drop method). The drop shape helps in determination of different surface and interfacial parameters such as surface tension of a liquid, interfacial tension between two liquids, and surface energy of solid substrates. Contact angle hysteresis is an important physical phenomenon arising from chemical inhomogeneities, roughness, or impurities on a surface which can affect how a liquid droplet spreads across a surface. Contact angle hysteresis is the difference between advancing and receding contact angles and can be measured using the “needle-in method” or by tilting the actual contact angle goniometer or sample stage itself, allowing the droplet to roll across the surface of the substrate. This paper will describe recent advances in contact angle goniometry and will explain how surface tension, interfacial tension, and contact angle hysteresis measurements can be easily and accurately made using a modern contact angle goniometer and software.
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Yu, Jiapeng, and Hao Wang. "Contact Angle Measurement Through Atomic Force Microscopy." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-64357.

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Understanding the structure near the three-phase contact line is critical for a comprehensive understanding of the thin-film region when a liquid partially wets a planer substrate. Despite numerous theoretical and simulation efforts found literature, an accurate experiment is difficult to conduct because of how small its scale. In the present work the accurate geometry of the region near the three-phase contact line was obtained by directly scanning the thin-film region with atomic force microscopy (AFM). The contact angles were directly extracted from the results and compared with the ones measured from traditional optical methods.
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Reports on the topic "Contact angle"

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Wu, Qihau, Kathryn Kremer, Stephen Gibbons, and Alan Kennedy. Determination of contact angle and surface tension of nanomaterial solutions by optical contact angle system. Engineer Research and Development Center (U.S.), July 2019. http://dx.doi.org/10.21079/11681/33395.

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Heller, Jack, and Emily Asenath-Smith. Surface wettability using contact angle goniometry. Cold Regions Research and Engineering Laboratory (U.S.), March 2018. http://dx.doi.org/10.21079/11681/26471.

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Ripple, Dean. Dynamic contact angle of a liquid spreading on a heated plate. Gaithersburg, MD: National Institute of Standards and Technology, 1999. http://dx.doi.org/10.6028/nist.ir.6351.

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Yu, Chau-Chih, Jin-Yan Hsu, and Tsung-Hua Hsu. The Development of Non-Contact Torque and Angle Sensor for Intelligent Power Assist System. Warrendale, PA: SAE International, October 2013. http://dx.doi.org/10.4271/2013-32-9119.

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Bessacini, Anthony F., and Robert F. Pinkos. Control of Remotely Guided Vehicles: A Method for Approaching a Stationary Contact at a Particular Arrival Angle or for Tail-Chasing a Moving Contact. Fort Belvoir, VA: Defense Technical Information Center, January 1997. http://dx.doi.org/10.21236/ada328759.

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Zen, Graham, Erika Guaba-Roldan, Jillian O'Neel, Anthony Benedetti, and Bryan Hunter. Optimizing Aluminum Bonding: Exploring Surface Roughness and Contact Angle Effects through Plasma and Acid Etching Contrasts. Office of Scientific and Technical Information (OSTI), June 2024. http://dx.doi.org/10.2172/2373138.

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Zen, Graham, Erika Guaba-Roldan, Jillian O'Neel, Anthony Benedetti, and Bryan Hunter. Optimizing Aluminum Bonding: Exploring Surface Roughness and Contact Angle Effects through Plasma and Acid Etching Contrasts. Office of Scientific and Technical Information (OSTI), June 2024. http://dx.doi.org/10.2172/2375826.

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Wallach, Rony, Tammo Steenhuis, Ellen R. Graber, David DiCarlo, and Yves Parlange. Unstable Flow in Repellent and Sub-critically Repellent Soils: Theory and Management Implications. United States Department of Agriculture, November 2012. http://dx.doi.org/10.32747/2012.7592643.bard.

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Water repellency causes unstable wetting fronts that result in water moving in preferential flowpaths through homogeneous soils as well in structured soils where macropores enhance the preferential flow pattern. Water repellency is typically associated with extended water ponding on the soil surface, but we have found that repellency is important even before the water ponds. Preferential flow fingers can form under conditions where the contact angle is less than 90o, but greater than 0o. This means that even when the soil is considered wettable (i.e., immediate penetration of water), water distribution in the soil profile can be significantly non-uniform. Our work concentrated on various aspects of this subject, with an emphasis on visualizing water and colloid flow in soil, characterizing mathematically the important processes that affect water distribution, and defining the chemical components that are important for determining contact angle. Five papers have been published to date from this research, and there are a number of papers in various stages of preparation.
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Shillito, Rose, Markus Berli, and Teamrat Ghezzehei. Quantifying the effect of subcritical water repellency on sorptivity : a physically based model. Engineer Research and Development Center (U.S.), July 2021. http://dx.doi.org/10.21079/11681/41054.

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Soil water wettability or water repellency is a phenomenon that can affect infiltration and, ultimately, runoff. Thus, there is a need to develop a model that can quantitatively capture the influence of water repellency on infiltration in a physically meaningful way and within the framework of existing infiltration theory. The analytical model developed in this study relates soil sorptivity (an infiltration parameter) with contact angle (a direct measure of water repellency) for variably saturated media. The model was validated with laboratory experiments using a silica sand of known properties treated to produce controlled degrees of water repellency. The measured contact angle and sorptivity values closely matched the model‐predicted values. Further, the relationship between the frequently used water drop penetration time test (used to assess water repellency) and sorptivity was illustrated. Finally, the direct impact of water repellency on saturated hydraulic conductivity was investigated due to its role in infiltration equations and to shed light on inconsistent field observations. It was found that water repellency had minimal effect on the saturated hydraulic conductivity of structureless sand. A quantitative model for infiltration incorporating the effect of water repellency is particularly important for post‐fire hydrologic modeling of burned areas exhibiting water repellent soils.
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Nishimura, Masatsugu, Yoshitaka Tezuka, Enrico Picotti, Mattia Bruschetta, Francesco Ambrogi, and Toru Yoshii. Study of Rider Model for Motorcycle Racing Simulation. SAE International, January 2020. http://dx.doi.org/10.4271/2019-32-0572.

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Various rider models have been proposed that provide control inputs for the simulation of motorcycle dynamics. However, those models are mostly used to simulate production motorcycles, so they assume that all motions are in the linear region such as those in a constant radius turn. As such, their performance is insufficient for simulating racing motorcycles that experience quick acceleration and braking. Therefore, this study proposes a new rider model for racing simulation that incorporates Nonlinear Model Predictive Control. In developing this model, it was built on the premise that it can cope with running conditions that lose contact with the front wheels or rear wheels so-called "endo" and "wheelie", which often occur during running with large acceleration or deceleration assuming a race. For the control inputs to the vehicle, we incorporated the lateral shift of the rider's center of gravity in addition to the normally used inputs such as the steering angle, throttle position, and braking force. We compared the performance of the new model with that of the conventional model under constant radius cornering and straight braking, as well as complex braking and acceleration in a single (hairpin) corner that represented a racing run. The results showed that the new rider model outperformed the conventional model, especially in the wider range of running speed usable for a simulation. In addition, we compared the simulation results for complex braking and acceleration in a single hairpin corner produced by the new model with data from an actual race and verified that the new model was able to accurately simulate the run of actual MotoGP riders.
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