Relevant bibliographies by topics / Sessile Drops

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Academic literature on the topic 'Sessile Drops'

Author: Grafiati
Published: 4 June 2021
Last updated: 6 September 2023

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Journal articles on the topic "Sessile Drops"

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Neeson, Michael J., Rico F. Tabor, Franz Grieser, Raymond R. Dagastine, and Derek Y. C. Chan. "Compound sessile drops." Soft Matter 8, no. 43 (2012): 11042. http://dx.doi.org/10.1039/c2sm26637g.

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ANDRIEU, C., D. A. BEYSENS, V. S. NIKOLAYEV, and Y. POMEAU. "Coalescence of sessile drops." Journal of Fluid Mechanics 453 (February 25, 2002): 427–38. http://dx.doi.org/10.1017/s0022112001007121.

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We present an experimental and theoretical description of the kinetics of coalescence of two water drops on a plane solid surface. The case of partial wetting is considered. The drops are in an atmosphere of nitrogen saturated with water where they grow by condensation and eventually touch each other and coalesce. A new convex composite drop is rapidly formed that then exponentially and slowly relaxes to an equilibrium hemispherical cap. The characteristic relaxation time is proportional to the drop radius R* at final equilibrium. This relaxation time appears to be nearly 107 times larger than the bulk capillary relaxation time tb = R*η/σ, where σ is the gas–liquid surface tension and η is the liquid shear viscosity.In order to explain this extremely large relaxation time, we consider a model that involves an Arrhenius kinetic factor resulting from a liquid–vapour phase change in the vicinity of the contact line. The model results in a large relaxation time of order tb exp(L/[Rscr ]T) where L is the molar latent heat of vaporization, [Rscr ] is the gas constant and T is the temperature. We model the late time relaxation for a near spherical cap and find an exponential relaxation whose typical time scale agrees reasonably well with the experiment.
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Walls, Daniel J., Eckart Meiburg, and Gerald G. Fuller. "The shape evolution of liquid droplets in miscible environments." Journal of Fluid Mechanics 852 (August 7, 2018): 422–52. http://dx.doi.org/10.1017/jfm.2018.535.

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Miscible liquids often come into contact with one another in natural and technological situations, commonly as a drop of one liquid present in a second, miscible liquid. The shape of a liquid droplet present in a miscible environment evolves spontaneously in time, in a distinctly different fashion than drops present in immiscible environments, which have been reported previously. We consider drops of two classical types, pendant and sessile, in building upon our prior work with miscible systems. Here we present experimental findings of the shape evolution of pendant drops along with an expanded study of the spreading of sessile drops in miscible environments. We develop scalings considering the diffusion of mass to group volumetric data of the evolving pendant drops and the diffusion of momentum to group leading-edge radial data of the spreading sessile drops. These treatments are effective in obtaining single responses for the measurements of each type of droplet, where the volume of a pendant drop diminishes exponentially in time and the leading-edge radius of a sessile drop grows following a power law of $t^{1/2}$ at long times. A complementary numerical approach to compute the concentration and velocity fields of these systems using a simplified set of governing equations is paired with our experimental findings.
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Noblin, X., A. Buguin, and F. Brochard-Wyart. "Vibrations of sessile drops." European Physical Journal Special Topics 166, no. 1 (January 2009): 7–10. http://dx.doi.org/10.1140/epjst/e2009-00869-y.

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Jensen, Ward, and Dongqing Li. "Thermodynamic stability of sessile drops." Colloids and Surfaces A: Physicochemical and Engineering Aspects 108, no. 1 (March 1996): 127–32. http://dx.doi.org/10.1016/0927-7757(95)03378-5.

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Hajirahimi, M., F. Mokhtari, and A. H. Fatollahi. "Exact identities for sessile drops." Applied Mathematics and Mechanics 36, no. 3 (February 2, 2015): 293–302. http://dx.doi.org/10.1007/s10483-015-1916-6.

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Sáenz, P. J., K. Sefiane, J. Kim, O. K. Matar, and P. Valluri. "Evaporation of sessile drops: a three-dimensional approach." Journal of Fluid Mechanics 772 (May 8, 2015): 705–39. http://dx.doi.org/10.1017/jfm.2015.224.

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The evaporation of non-axisymmetric sessile drops is studied by means of experiments and three-dimensional direct numerical simulations (DNS). The emergence of azimuthal currents and pairs of counter-rotating vortices in the liquid bulk flow is reported in drops with non-circular contact area. These phenomena, especially the latter, which is also observed experimentally, are found to play a critical role in the transient flow dynamics and associated heat transfer. Non-circular drops exhibit variable wettability along the pinned contact line sensitive to the choice of system parameters, and inversely dependent on the local contact-line curvature, providing a simple criterion for estimating the approximate contact-angle distribution. The evaporation rate is found to vary in the same order of magnitude as the liquid–gas interfacial area. Furthermore, the more complex case of drops evaporating with a moving contact line (MCL) in the constant contact-angle mode is addressed. Interestingly, the numerical results demonstrate that the average interface temperature remains essentially constant as the drop evaporates in the constant-angle (CA) mode, while this increases in the constant-radius (CR) mode as the drops become thinner. It is therefore concluded that, for increasing substrate heating, the evaporation rate increases more rapidly in the CR mode than in the CA mode. In other words, the higher the temperature the larger the difference between the lifetimes of an evaporating drop in the CA mode with respect to that evaporating in the CR mode.
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Chang, Chun-Ti, J. B. Bostwick, Susan Daniel, and P. H. Steen. "Dynamics of sessile drops. Part 2. Experiment." Journal of Fluid Mechanics 768 (March 10, 2015): 442–67. http://dx.doi.org/10.1017/jfm.2015.99.

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High-speed images of driven sessile water drops recorded under frequency scans are analysed for resonance peaks, resonance bands and hysteresis of characteristic modes. Visual mode recognition using back-lit surface distortion enables modes to be associated with frequencies, aided by the identifications in Part 1 (Bostwick & Steen, J. Fluid Mech., vol. 760, 2014, pp. 5–38). Part 1 is a linear stability analysis that predicts how inviscid drop spectra depend on base state geometry. Theoretically, the base states are spherical caps characterized by their ‘flatness’ or fraction of the full sphere. Experimentally, quiescent shapes are controlled by pinning the drop at a circular contact line on the flat substrate and varying the drop volume. The response frequencies of the resonating drop are compared with Part 1 predictions. Agreement with theory is generally good but does deteriorate for flatter drops and higher modes. The measured frequency bands agree better with an extended model, introduced here, that accounts for forcing and weak viscous effects using viscous potential flow. As the flatness varies, regions are predicted where modal frequencies cross and where the spectra crowd. Frequency crossings and spectral crowding favour interaction of modes. Modal interactions of two kinds are documented, called ‘mixing’ and ‘competing’. Mixed modes are two pure modes superposed with little evidence of hysteresis. In contrast, modal competition involves hysteresis whereby one or the other mode disappears depending on the scan direction. Perhaps surprisingly, a linear inviscid irrotational theory provides a useful framework for understanding observations of forced sessile drop oscillations.
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Wang, Y., and L. Bourouiba. "Non-isolated drop impact on surfaces." Journal of Fluid Mechanics 835 (November 27, 2017): 24–44. http://dx.doi.org/10.1017/jfm.2017.755.

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Upon impact on a solid surface, a drop expands into a sheet, a corona, which can rebound, stick or splash and fragment into secondary droplets. Previously, focus has been placed on impacts of single drops on surfaces to understand their splash, rebound or spreading. This is important for spraying, printing, and environmental and health processes such as contamination by pathogen-bearing droplets. However, sessile drops are ubiquitous on most surfaces and their interaction with the impacting drop is largely unknown. We report on the regimes of interactions between an impacting drop and a sessile drop. Combining experiments and theory, we derive the existence conditions for the four regimes of drop–drop interaction identified, and report that a subtle combination of geometry and momentum transfer determines a critical impact force governing their physics. Crescent-moon fragmentation is most efficient at producing and projecting secondary droplets, even when the impacting drop Weber number would not allow for splash to occur on the surface considered if the drop were isolated. We introduce a critical horizontal impact Weber number $We_{c}$ that governs the formation of a sheet from the sessile drop upon collision with the expanding corona of the impacting drop. We also predict and validate important properties of the crescent-moon fragmentation: the extension of its sheet base and the ligaments surrounding its base. Finally, our results suggest a new paradigm: impacts on most surfaces can make a splash of a new kind – a crescent-moon – for any impact velocity when neighbouring sessile drops are present.
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Zhao, Menghua, François Lequeux, Tetsuharu Narita, Matthieu Roché, Laurent Limat, and Julien Dervaux. "Growth and relaxation of a ridge on a soft poroelastic substrate." Soft Matter 14, no. 1 (2018): 61–72. http://dx.doi.org/10.1039/c7sm01757j.

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Dissertations / Theses on the topic "Sessile Drops"

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Baughman, Kyle. "Deposition of Bacteria from Sessile Drops." Diss., The University of Arizona, 2009. http://hdl.handle.net/10150/194109.

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This dissertation reports on the discovery of a new method of patterning bacteria (Pseudomonas aeruginosa PAO1) on a surface using a drying sessile drop. This work identifies bacterial suspension age and the length of time mica is exposed to the laboratory atmosphere as the key parameters which impact the behavior of the sessile drop and the resulting residue. Possible origins of mica aging and bacterial suspension aging are discussed in light of the literature and the experimental conditions. The residue area and the fraction of the residue area on which substantial bacteria and salt deposits remained after the drying of the drop (fill-in fraction) were measured via analysis of optical micrographs. In general, smaller residues are more filled in. For fresh bacterial suspensions, and short mica exposure times, the residue covers the largest area and is characterized by rings formed during discrete depinning events as the solvent evaporates. As the exposure time increases and the mica surface slowly picks up contaminants from the atmosphere, the drop residue shrinks in size and bacteria are deposited in a regular cellular film in the interior of the drop residue. The fraction of the interior area covered by the cellular film is well correlated with the mica exposure time. For sufficiently aged bacterial suspensions, residues are small and more filled-in than residues formed from fresh suspensions on similarly aged mica. In addition, the interior deposition pattern transitions from a cellular film characteristic of fresh suspensions to a cracked carpet pattern for aged suspensions. Suspension aging related changes in the residues are attributed to accumulation of organic materials such as DNA, RNA, proteins, and other bacterial components in the suspension. The suspension aging process is also observed to be at least partially dependent on ventilation of the suspension during aging.
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Bou-Zeid, Wassim. "Wettability and evaporation of sessile drops of biological fluids." Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM4348/document.

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Le processus d'étalement et d'évaporation d'une goutte de suspensions de particules sur une surface solide est très intéressant permettant la formation de motifs. Une étude expérimentale à été effectuée avec du sang total humain et avec des fluides purs dans une chambre sous atmosphère contrôlée en humidité relative. Pour des angles de contact faible, le processus d'étalement/évaporation peut être divisé en deux régimes. Un premier régime rapide gouverné par un équilibre entre les forces visqueuses et les forces capillaires et un deuxième régime plus lent dominé par la cinétique d'évaporation. Nous montrons que les bio-colloïdes jouent un rôle significatif sur la dynamique de la ligne de contact. La vitesse moyenne de la ligne de contact suit la même dynamique d'étalement que le modèle de Tanner, où le temps d'étalement et les paramètres géométriques de la goutte sont fonctions de l'humidité. Dans cette étude, nous montrons que l'humidité relative influence les paramètres géométriques de la goutte et par conséquent le motif a la fin du processus d'évaporation. Un modèle purement diffusif pur a été obtenu dont le diamètre de mouillage et l'angle de contact sont fonction de l'humidité. Pour l'analyse morphologique des motifs de craquelures, une méthode de segmentation manuelle a été utilisée comme une méthode de référence pour la validation de la méthode de segmentation automatique développée dans "iBlood". Par cette méthode, nous montrons que la cinétique d'évaporation influence la distribution structurelle et morphologique des cellules de forme trapézoïdale, et par conséquent, l'espacement des fractures moyenne finale
Spreading/evaporation process of droplets over solid surfaces is a fundamental process and a wide research field because of number of applications in printing, micro-electronics, DNA analysis and even in biomedical. This experimental work aims to investigate the effect of relative humidity on the contact line dynamics, on the evaporation dynamics and on the final pattern of a drop of whole human blood. The spreading of a pure fluid model that has the same physical properties as human blood was studied and compared to the blood. We showed that bio-colloids play significant effect on the dynamics of contact line and the pinning effect of the drop. For low contact angles, we showed that the spreading/evaporation process could be divided into two regimes. A fast first regime determined by a balance between viscous forces and capillary forces and a second slower regime dominated by the evaporation rate. Physical mechanisms that are responsible for the spreading enhancement are proposed and discussed. The average velocity of the contact line was found to follow the same behaviour as Tanner's model, where the spreading dynamics and geometrical parameters of the droplet are function of relative humidity. The experimental measurements are in a good agreement with the purely diffusive model where the equilibrium wetting radius and contact angle are function of relative humidity. For the morphological analysis of crack patterns, a manual segmentation method was used as a reference for the validation of the automatic developed segmentation method. We showed that the evaporation rate influences structural distribution of plaques in the corona region and hence, the mean crack spacing
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Zhang, Ying. "Coalescence of Sessile Drops: the Role of Gravity, Interfacial Tension and Surface Wettability." Research Showcase @ CMU, 2016. http://repository.cmu.edu/dissertations/994.

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Coalescence of liquid drops is important in many natural and industrial processes, such as raining, inkjet printing and coating applications. The coalescence for sessile drops is more complicated due to the additional interplay between the drops and solid surface. This work examines the impact of gravity, interfacial tensions and wetting properties on both the static and dynamic aspects of the coalescence of sessile drops. In the presence of gravity, seven dimensionless parameters are identified to describe the axisymmetric configuration of a compound sessile drop after coalescence. A stability criterion is established based on the perturbation of Laplacian shape and the stability criterion is numerically evaluated in the zero Bond number limit. Surface Evolver simulations and experiments are performed for compound sessile drops at small and intermediate Bond numbers. Both simulations and experiments agree closely with the zero Bond number analysis, exhibiting a small discrepancy at intermediate Bond number. For the dynamics of sessile drop coalescence, experiments are performed for miscible fluids with similar surface tensions but different densities and viscosities. The coalescence behavior shows three distinctive stages with well separated timescales: an initial stage of fast bridge healing process, an intermediate stage of advective motion for fluids with different densities, and a final stage of diffusion. A dimensional analysis shows that the flow behavior for the advective motion resembles gravity current. A more detailed analytical model based on the lubrication approximation is conducted and demonstrates good qualitative agreement with the advective motion during the sessile drop coalescence.
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Carle, Florian. "Flow motion in sessile droplets : evaporation and nanoparticles assembly." Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM4726/document.

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L'évaporation d'une goutte reposant sur un support plat semble être un système relativement simple à étudier et a fait l'objet d'études scientifiques depuis plus d'un siècle. Cependant, l'étude de l'évaporation de gouttes sessiles est toujours d'actualité aujourd'hui avec l'essor de nouvelles techniques de visualisation ou de l'apparition de nouveaux types de fluides complexes.Cette étude expérimentale sera focalisée sur deux aspects distincts :- L'étude sur l'évaporation de fluides purs permettra d'étudier la dynamique d'évaporation et les ondes hydrothermales qui apparaissent dans les gouttes de fluides volatils lors du changement de phase. L'influence du type de fluide (différents alcools et alcanes) et du niveau de gravité (terrestre, lunaire et martienne) seront étudiés. De plus, l'utilisation de différents niveaux de gravité permet de développer un modèle empirique afin de prendre en compte dans le modèle quasi-stationnaire limité par diffusion de la vapeur la convection naturelle qui augmente fortement le débit d'évaporation.- Si les fluides complexes présentent une dynamique de séchage similaire à celle des fluides purs, d'autres mécanismes entrent en jeux, comme la gélification, l'organisation des particules et l'apparition de craquelures (voir Figure 2). Le mouillage et les différents groupes fonctionnels graphés sur les particules seront étudiés en regard du motif final de craquelures
Sessile droplets are widely found in day to day life: it might be a coffee spilt, rain onto a waterproof raincoat or again, water falling onto a cooking plate. However, despite the vast number of studies devoted to droplets for almost half a century, the fundamental phenomenon of the evaporation of sessile droplets is still a field that attracts a high level of interest due to its wide applicability and the development of new visualisation techniques or new types of complex fluids. This experimental study is focused two distinct aspects:- The evaporation of pure fluids has allow to study hydrothermal waves that appear in the droplets of volatile fluids during phase change. The influence of the type of fluid ---different alcohols and alkanes--- and the gravity levels ---Terrestrial, Lunar and Martian--- is investigated to have a better understanding of the flow motion inside droplet. Moreover, the use of different gravity levels allows to experimentally evidence the contribution of the atmospheric convective transport to sessile droplet evaporation. This investigation has allowed to develop an empirical model to take account of natural convection which greatly increases the evaporation rate in the quasi-steady diffusion-controlled evaporation model.- If complex fluids exhibit an evaporation dynamic similar to pure fluid, other mechanisms come into play, such as gelation, particles organisation and cracks formation. Wetting and different functional groups on the particles graphs will be studied in relation to the final pattern of cracks
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Sartori, Paolo. "The Role of Interfaces in Microfluidic Systems: Oscillating Sessile Droplets and Confined Bacterial Suspensions." Doctoral thesis, Università degli studi di Padova, 2017. http://hdl.handle.net/11577/3423250.

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This PhD thesis is focused on the role of interfaces that characterize microfluidic systems, such as the free air/liquid interface of drops or the liquid/solid interface of fluids enclosed in microchannels. This work has a twofold character: on one side, we studied the dynamics of sessile drops subject to oscillations of the substrate; on the other, we investigated the spatial concentration distribution of suspensions of motile bacteria, as a model system for active collids, tuned by geometrical confinement. Dynamics of sessile drops. The first topic is related to the field of wetting phenomena and open microfluidics, which deals with the behaviour of drops, typically in the nano-/microliter range, deposited on open surfaces. At such length scale, these systems are dominated by capillarity and may give rise to unexpected effects, not commonly observed at the larger scale we are used to. Our studies aim to the achievement of an active control on the motion and shape of drops by means of vibration of the substrates, for chemical or biological applications. In particular, the motion of liquid drops on an inclined substrate subject to vertical harmonic oscillations have been considered. Typically, small droplets on inclined surfaces remain pinned because of contact angle hysteresis. When vertical oscillations are applied the droplets unpin and slide down. Surprisingly, for sufficiently large oscillation amplitude the droplets move upward against gravity. The systematical investigation of the response of drops on varying peak acceleration and frequency of oscillations, for fluids with different surface tensions and viscosity, allowed the control of the unidimensional motion along the substrate. Then, we have studied the interfacial morphologies of water drops confined on the hydrophilic top face of rectangular posts of width 0.5 mm and various length. For small volumes, the liquid film adopts the shape of a homogeneous filament with a uniform cross section close to a circular segment. For larger volumes, the water interface forms a central bulge, which grows with the volume. In the case of posts longer than a characteristic length, the transition between the two film shapes on varying the volume is discontinuous and exhibits the bistability of the two morphologic states associated with a hysteresis phenomenon. Vertically oscillating the post, with fixed water volume corresponding to the bistability, at certain frequencies induces an irreversible transition from the filament to the bulge state. Self-propelled particles under geometrical confinement. The second topic deals with the behaviour of active fluids, i.e. self-propelled colloid suspensions which are intrinsically out of equilibrium systems (Active Matter). In particular, in the presence of geometrical structures, such systems behave in a very different way with respect to equilibrium Browinan colloids. We have analyzed the role of different swimming patterns on the concentration distribution of bacterial suspensions confined between two flat walls, by considering wild-type E. coli and P. aeruginosa, which perform Run and Tumble and Run and Reverse patterns, respectively. The concentration profiles have been obtained by counting motile bacteria at different distances from the bottom wall. In agreement with previous studies, an accumulation of motile bacteria close to the walls was observed. Different fraction of motile bacteria and different wall separations, ranging from 100 μm to 250 μm, have been tested. The concentration profiles resulted to be independent on the walls separation and on the different kind of motility and to scale with the motile fraction. These results are confirmed by numerical simulations, based on a collection of self-propelled rod-like particles interacting only through steric interactions.
Questa tesi di dottorato prende in esame il ruolo delle interfacce che caratterizzano i sistemi microfluidici, come ad esempio l’interfaccia libera aria/acqua delle gocce o l’interfaccia liquido/solido di fluidi racchiusi in microcanali. Questo lavoro ha un duplice carattere: da una parte, abbiamo studiato la dinamica di gocce sessili soggette ad oscillazioni del substrato; dall’altra, abbiamo investigato come la distribuzione spaziale della concentrazione in sospensioni batteriche, prese come sistema modello per colloidi attivi, venga alterata da un confinamento geometrico. Dinamica di gocce sessili. Il primo argomento rientra nel campo dei fenomeni di bagnabilità e della microfluidica aperta, che tratta il comportamento di gocce, tipicamente nel range dei nano- /microlitri, depositate su superfici aperte. A tali scale di lunghezza, questi sistemi sono dominati dalla capillarità a possono produrre effetti inaspettati che non vengono comunemente osservati alle scale macroscopiche a cui siamo abituati. I nostri studi sono volti al raggiungimento del controllo attivo del moto e della forma delle gocce per mezzo di vibrazioni del substrato, con applicazioni dalla Chimica alla Biologia. In particolare, è stato considerato il moto di gocce su in substrato inclinato sottoposto ad oscillazioni armoniche verticali. Normalmente, su superfici inclinate le goccioline rimangono ferme a causa dell’isteresi dell’angolo di contatto. Quando vengono applicate oscillazioni verticali le goccioline si sbloccano e scivolano giù. Sorprendentemente, per ampiezze di oscillazioni sufficientemente grandi le goccioline si muovono verso l’atro contro la forza di gravità. Un’analisi della risposta delle gocce al variare dell’accelerazione di picco e della frequenza di oscillazione, prendendo in esame fluidi con diverse tensioni superficiali e viscosità, ha permesso il controllo del moto unidimensionale lungo il pianoinclinato. Inoltre, abbiamo studiato le morfologie interfacciali di gocce d’acqua confinate sulla faccia superiore idrofilica di post rettangolari con larghezza 0.5 mm e varie lunghezze. Per piccoli volumi, il film liquido prende la forma di un filamento omogeneo con una cross-section uniforme simile ad un segmento circolare. Per volumi più grandi, l’interfaccia acqua/aria forma un rigonfiamento centrale, che cresce con il volume. Nel caso di post più lunghi di una lunghezza caratteristica, la transizione tra le due forme al variare del volume discontinua e mostra la bistabilità dei due stati morfologici associata ad un fenomeno di isteresi. Applicando al post, con volume d’acqua fissato corrispondente alla bistabilità, vibrazioni verticali con determinate frequenze si più indurre una transizione irreversibile dallo stato di filamento omogeneo a quello rigonfiato. Particelle auto-propulse sotto confinamento geometrico. Il secondo argomento riguarda il comportamento di fluidi attivi, cioè sospensioni di colloidi auto-propulsi che costituiscono sistemi intrinsecamente fuori equilibrio (Materia Attiva). In particolare, in presenza di strutture geometriche, tali sistemi si comportano in modo molto differente rispetto a colloidi Browniani all’equilibrio. Abbiamo analizzato il ruolo di diversi schemi di motilità sulla distribuzione di concentrazione di sospensioni batteriche confinate tra due pareti solide. considerando E. coli a P. aeruginosa wild-type, che si muovono secondo gli schemi Run and Tumble e Run and Reverse, rispettivamente. I profili di concentrazione sono tati ottenuti contando i batteri motili a diverse distanze dalle pareti. In accordo con studi precedenti, si osservato un accumulo di batteri motili in prossimit delle pareti. Sono state testate diverse frazioni di batteri motili e diverse distanze di separazione tra le pareti, nel range tra 100μm e 250 μm. I profili di concentrazione risultano indipendenti dalla distanza tra le pareti e dai differenti schemi di motilità e scalano con la frazione di batteri motili. Questi risultati sono confermati da simulazioni numeriche, basate su una collezione di particelle allungate auto-propulse che interagiscono solo tramite interazioni steriche.
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Robson, Alyssa A. "Surface Tension Measurements of Various Surfactants Using the Constrained Sessile Drop Method." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1398819754.

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Bahramian, Anohe. "Evaluating surface energy components of asphalt binders using Wilhelmy Plate and Sessile Drop Techniques." Thesis, KTH, Väg- och banteknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-117463.

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In this Study, the surface energy was investigated for six penetration grade 70/100 bitumen binders. Wilhelmy Plate and the Sessile Drop were used to determine the contact angles. The purpose of this study was to compare the Wilhelmy Plate method with the Sessile Drop method, and to compare the significance of Owens-Wendt model with the significance of Acid Base model by correlating surface energy components. Better R2 –values were found for surface energy components by using the Owens-Wendt model than by using the Acid Base model. It was concluded here that Owens-Wendt model is a better model for determining surface energy components of bituminous binders than the Acid Base model since bituminous binders have low energy surfaces. For both instruments: When using Diiodomethane as a probe liquid the biggest variations among the binders were observed. When using water as a probe liquid the least variations among the binders were observed. The advancing contact angles for water determined for these six bitumen binders using the Wilhelmy plate method do not exceed the 90 degree by much, suggesting that bitumen is not extremely hydrophobic. The Sessile Drop method offers a faster and more convenient way to measure the surface energy components of bitumen binders than the Wilhelmy Plate method.
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Hamuyuni, Joseph. "Measurement of surface tension in base metal sulphide mattes by an improved sessile drop method." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/71651.

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Abusaksaka, Abdulgadir Ahmed. "Structuration et défauts de surface et de volume lors du séchage de suspensions colloïdales." Thesis, Grenoble, 2013. http://www.theses.fr/2013GRENI089/document.

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La maîtrise de la fabrication de films de suspension colloïdale par évaporation constitueencore à ce jour, un véritable verrou scientifique pour l’élaboration des matériaux. Le séchage desuspensions colloïdales entraine souvent des défauts de surface et de volume dans le film. Lorsque lesparticules sont molles, les films sont continus mais présentent des défauts de plissement de surface.Lorsque les particules sont dures (latex vitreux, silice..), le film se fissure et se délamine. Ces défautssont souvent liés aux contraintes résiduelles dans le gel à la fin du séchage qui sont dues à la pressioncapillaire causée par la déformation des ménisques d’eau à la surface des films. Par contre on neconnait pas encore l’échelle de taille où agit la contrainte ni la relation entre la contrainte et la périodedes craquelures.Dans ce travail de thèse, nous étudions la morphologie des craquelures dans des films dedivers mélanges de suspensions colloïdales, élaborés par séchage. Ces mélanges sont composés departicules dures (polystyrène et PBMA réticulés) et molles (PBA et PBMA). La structurenanométrique de ces mélanges est caractérisée par diffusion de neutron et par turbidité. Nousdisposons de mélanges avec diverses structures et divers états de dispersion. Certains mélangescontiennent des particules dispersées à l’échelle nanométrique (l’ordre de grandeur est celle de la tailledes particules - 50 nm) alors que d’autres contiennent des particules agrégées. L’étude de lamorphologie des craquelures est réalisée sur des gouttes sessiles avec séchage à la surface libre. Descraquelures radiales périodiques sont observées lors du séchage. Nous observons que la période descraquelures augmente avec l’augmentation de la fraction en particules molles et de la température maistoute en conservent la périodicité. Nous avons mis en évidence que le rapport : période des craqueluressur l’épaisseur des films λ/h est le seul paramètre qui décrit parfaitement la morphologie descraquelures pour un séchage au niveau d’une surface libre. Nous avons aussi démontré que ce rapportλ/h ne peut pas descendre au-dessous de 2 même dans le cas de particules vitreuses. Le séchage induitde fortes contraintes résiduelles dans le gel qui permettent à certaines fibres situées entre deuxcraquelures de délaminer radialement. Ce phénomène de délamination s’estompe avec la dissipationdes contraintes. Nous avons démontré que le modèle mécanique de Russel ne permet pas de décrire lapériode de craquelures loin de la contrainte critique. Nous proposons ainsi dans le cadre de notretravail, un autre modèle plus à même à caractériser la périodicité de ces craquelures. Nous avonsremarqué que les propriétés du substrat n'ont aucune incidence sur la morphologie des craquelures. Letaux d'évaporation modifie la morphologie des craquelures, où dans le cas d’un séchage rapide, onobtient des fibres décollées longues unidirectionnelles tandis que pour le cas d’un séchage lent, onassiste à la formation de craquelures non décollées avec apparition de craquelures secondairestransverses
Controlling the production of colloidal suspension films by evaporation is still, nowadays, atruly scientific obstacle for materials development. The drying of colloidal suspensions leads often tosurface and volume defects in the film. When the particles are soft, films are continuous but haveseveral folding surface defects. However, when the particles are hard (glassy latex, silica,...), the filmtends to crack and to be delaminated. These defects are often associated with residual stresses in thegel at the end of drying, due to the capillary pressure caused by the water menisci deformation at thefilm surface. Nevertheless, neither the size scale where constraint acts nor the relation between stressand cracking time were known.In this thesis we present the study of cracks morphology observed in films of differentcolloidal suspension mixtures obtained by a drying process. These mixtures are composed of hard(polystyrene crosslinked PBMA) and soft (PBA and PBMA) particles. The nanometric structure ofthese mixtures is obtained through neutron scattering and turbidity studies. We have mixtures withdifferent structures and different states of dispersion. While some mixtures contain dispersed particlesat a nanoscale, with an order of magnitude same as the particles size - 50 nm, some others containaggregated particles. The study of cracks morphology is performed on sessile drops by drying at thefree surface. Periodic radial cracks are observed during drying. We also observe that cracks periodincrease with the increment of soft particles fraction and temperature, but keeping constant itsperiodicity. We have demonstrated that the ratio: crack period between film thickness, i.e. λ/h, is theonly parameter that describes perfectly cracks morphology for a drying process at a free surface. Wealso demonstrated that this relation (λ/h) couldn’t decrease below 2 even in the case of glassy particles.Drying process induces high residual stresses in the gel, allowing to some fibers located between twocracks to delaminate radially. This delamination phenomenon fades with dissipation constraints. Wehave also established that the Russel’s mechanical model does not describe the period of cracks nearthe critical stress. Therefore, in this work we propose another model able to characterize theperiodicity of the cracks. We noticed that the properties of the substrate did not affect cracksmorphology. The evaporation rate changes the morphology of cracks, which in the case of a quickdrying it is possible to obtain unidirectional long loose fibers. However, for a slow drying, we arewitnessing the formation of not protruding cracks with the apparition of secondary transverse cracks
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Singh, Sandeep. "Thermo-mechanical Behavior of Glass Based Seals for Solid Oxide Fuel Cells." University of Cincinnati / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1288379341.

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Books on the topic "Sessile Drops"

1

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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L, Ellis David, Michal Gary Max, and Lewis Research Center, eds. Graphite/copper alloy interfacial energies determined using the sessile drop method. Cleveland, Ohio: Case Western Reserve University, 1991.

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United States. Congress. House. Committee on Banking, Finance, and Urban Affairs. Impact of the stock market drop and related economic developments on interest rates, banking, monetary policy and economic stability: Hearing before the Committee on Banking, Finance, and Urban Affairs, House of Representatives, One-hundredth Congress, first session, October 29, 1987. Washington: U.S. G.P.O., 1988.

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United States. Congress. House. Committee on Banking, Finance, and Urban Affairs. Subcommittee on Financial Institutions Supervision, Regulation, and Insurance. Impact of the stock market drop and related economic developments: Hearing before the Subcommittee on Financial Institutions Supervision, Regulation, and Insurance of the Committee on Banking, Finance, and Urban Affairs, House of Representatives, One-hundredth Congress, second session, February 3, 1988. Washington: U.S. G.P.O., 1988.

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Full committee hearing on drop in retirement savings: The challenges small businesses face funding and maintaining retirement plans in a struggling economy : hearing before the Committee on Small Business, United States House of Representatives, One Hundred Eleventh Congress, first session, hearing held February 25, 2009. Washington: U.S. G.P.O., 2009.

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Amending the Iran Sanctions Act of 1996; NATO Freedom Consolidation Act of 2007; amending the Foreign Affairs Reform and Restructuring Act of 1998; expressing the sense of the House that Bangladesh immediately drop all pending charges against Salah Uddin Shoaib Choudhury; honoring the life of Dr. John Garang de Mabior and reaffirming the continued commitment to peace in the Republic of Sudan; calling for the immediate release of Israeli soldiers held captive by Hamas and Hezbollah, and for other purposes; and supporting the goals of International Women's Day: Markup before the Committee on Foreign Affairs, House of Representatives, One Hundred Tenth Congress, first session, on H.R. 957, H.R. 987, H.R. 1003, H. Res. 64, H. Res. 98, H. Res. 107 and H. Res. 149, February 15, 2007. Washington: U.S. G.P.O., 2007.

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Berg, Marcus. Estimation of Hydrophobicity of Insulating Surfaces by Studying Sessile Water Drops (Uppsala Dissertations from the Faculty of Science & Technology, 33) ... the Faculty of Science & Technology, 33). Coronet Books, 2001.

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Gitiafroz, Roya. Study of surface tension of pulmonary surfactant using a constrained sessile drop technique. 2005.

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Book chapters on the topic "Sessile Drops"

1

Tan, Huanshu, Christian Diddens, Xuehua Zhang, and Detlef Lohse. "Chapter 3. Evaporation of Ternary Sessile Drops." In Soft Matter Series, 33–46. Cambridge: Royal Society of Chemistry, 2022. http://dx.doi.org/10.1039/9781839161186-00033.

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Duchesne, Marc A., and Robin W. Hughes. "Slag Surface Tension Measurements with Constrained Sessile Drops." In Advances in Molten Slags, Fluxes, and Salts: Proceedings of the 10th International Conference on Molten Slags, Fluxes and Salts 2016, 557–64. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-48769-4_59.

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Duchesne, Marc A., and Robin W. Hughes. "Slag Surface Tension Measurements with Constrained Sessile Drops." In Advances in Molten Slags, Fluxes, and Salts, 557–64. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119333197.ch59.

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Shanahan, M. E. R. "Sessile Drops on Heterogeneous Surfaces : Static and Dynamic Behaviour." In Adhesion 15, 116–30. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3854-3_8.

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Mistry, Aashutosh, and K. Muralidhar. "Spreading of Sessile and Pendant Drops on Partially Wetting Surfaces." In Mechanical Engineering Series, 41–80. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-48461-3_2.

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Somwanshi, Praveen M., K. Muralidhar, and Sameer Khandekar. "Wall Shear Rates Generated During Coalescence of Pendant and Sessile Drops." In Fluid Mechanics and Fluid Power – Contemporary Research, 33–42. New Delhi: Springer India, 2016. http://dx.doi.org/10.1007/978-81-322-2743-4_4.

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David, S., Khellil Sefiane, and Lounes Tadrist. "Experimental Investigation of the Effect of the Ambient Gas on Evaporating Sessile Drops." In Defect and Diffusion Forum, 461–68. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/3-908451-36-1.461.

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David, S., Khellil Sefiane, and Martin E. R. Shanahan. "On the Dynamics of Wetting of Water-Methanol Volatile Sessile Drops on Smooth Substrates." In Defect and Diffusion Forum, 469–73. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/3-908451-36-1.469.

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Finn, Robert. "The Symmetric Sessile Drop." In Grundlehren der mathematischen Wissenschaften, 37–66. New York, NY: Springer New York, 1986. http://dx.doi.org/10.1007/978-1-4613-8584-4_3.

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Dryden, Windy. "What is a ‘Drop-Out'?" In Single-Session Therapy (SST), 28–29. 2nd ed. London: Routledge, 2023. http://dx.doi.org/10.4324/9781003386353-9.

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Conference papers on the topic "Sessile Drops"

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Sobac, Benjamin, and David Brutin. "Heat Transfer and Flow Instabilities in Ethanol Sessile Drops Under Evaporation." In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-22185.

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Thanks to a recent increase in space resolution and temperature accuracy of infrared camera device, it’s now possible to perform thermal visualizations of sessile drops under evaporation. Using infrared techniques, we can access local thermal motions inside millimetric drops without perturbing the internal mechanisms. In the full paper, we will provide a literature review of experimental, numerical simulation and theoretical work recently perform on sessile drop evaporation. We will also detail the experimental setup which has been elaborated to realize these thermal observations. Using infrared and visible video recording, we can follow respectively the evolution of the motion inside the drop and the drop shape during evaporation. Using a heat fluxmeter placed below the drop, we can analyze the heat transfer between the substrate and the drop. We will completely describe the evaporation process based on a reference experiment and evidence the existence of several phases during this process. Then, we will dwell on the heat flux transferred to the drop during each step of the evaporation process to obtain very important information about the coupling between flow motion and heat transfer coefficient. Finally, we will present the influence of substrate temperature and drop size on the evaporation process which leads us to build a scaling law and better understand drop evaporation process.
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Josyula, Tejaswi, Chandan Manghnani, Pallab Sinha Mahapatra, and Arvind Pattamatta. "Thermal Patterns and Internal Flow Mechanisms in Evaporating Inverted Sessile Drops of Pure Water." In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-11256.

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Abstract We report an experimental investigation on contact line dynamics, thermal patterns, and internal fluid flow during the evaporation of inverted sessile drops of pure water. This configuration of sessile drop when placed on a heated substrate should lead to thermal stratification and any internal convective flow will be governed by surface tension driven Marangoni flow. First, we report contact line dynamics and thermal patterns recorded using an optical camera and infrared camera, respectively. An interesting outcome from the present study is the resemblance observed between the evolution of contact angle and interfacial temperature difference during evaporation. By performing Particle Image Velocimetry to delineate the internal flow characteristics, we report an axisymmetric counter-rotating flow inside the drop. This flow is directed towards the substrate from the apex at the centerline of the drop. In literature, a similar directional flow is reported to be due to Marangoni flow albeit for a normal sessile drop. Further, by extracting the magnitude of velocity, we report a maximum velocity in the flow occurring at the center of drop which in turn increases with substrate temperature. The results reported in the present study shed light on the presence of Marangoni flow in pure water drops whose understanding is of paramount importance in many academic and industrial applications.
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Prastowo, Aishah, Peter R. Cook, and Edmond J. Walsh. "Biocompatibility of Sessile Drops as Chambers for Cell Culture." In 2019 2nd International Conference on Bioinformatics, Biotechnology and Biomedical Engineering (BioMIC) - Bioinformatics and Biomedical Engineering. IEEE, 2019. http://dx.doi.org/10.1109/biomic48413.2019.9034845.

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Su, Yeong-Jen, and Wen-Jei Yang. "THERMOCAPILLARY CONVECTION IN EVAPORATING SESSILE DROPS WITH INTERNAL SOLIDIFICATIONS." In International Heat Transfer Conference 9. Connecticut: Begellhouse, 1990. http://dx.doi.org/10.1615/ihtc9.3810.

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Song, Hyunsoo, Yongku Lee, Songwan Jin, Ho-Young Kim, and Jung Yul Yoo. "Sessile Drop Evaporation on Surfaces of Various Wettability." In ASME 2008 First International Conference on Micro/Nanoscale Heat Transfer. ASMEDC, 2008. http://dx.doi.org/10.1115/mnht2008-52096.

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This work experimentally investigates the evaporation rates of water drops on surfaces of various wettability. By measuring the temporal evolutions of the drop radius and contact angle, we find the qualitative difference between the evaporation behavior on hydrophilic surfaces where the contact radius remains constant initially and that on the superhydrophobic surfaces where the contact angle remains constant. Also, the evaporation rate is observed to depend on the surface material although the currently available models assume that the rate is solely determined by the drop geometry. Although the theory to explain this dependence on the surface remains to be pursued by the future work, we give the empirical relations that can be used to predict the drop volume evolution for each surface.
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Matar, Omar K. "Pattern Formation in Evaporating Drops With and Without Nanoparticles." In ASME 2011 9th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2011. http://dx.doi.org/10.1115/icnmm2011-58292.

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We show how asymptotic reduction techniques are used to model the motion of sessile droplets in the presence of heat transfer, evaporation and nanoparticles. When nanoparticles are present in the drop, lubrication theory is used to model the contact line dynamics and the evolution of the nanoparticle concentration. The model accounts for the effects of surface tension, Marangoni stresses, evaporation and intermolecular forces; the effect of nanoparticles on the latter endows the film with structural disjoining pressure forces near the contact line. Our numerical simulations catalogue the different types of possible contact line dynamics, which range from spreading and retraction, to pinning and ‘terracing’; the latter phenomenon is caused by the effect of nanoparticles on the intermolecular forces.
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Trinavee, Kumari, Naga Siva Kumar Gunda, and Sushanta K. Mitra. "Wetting of Water Drops on a PMMA Substrate in Viscous Medium." In ASME 2018 16th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/icnmm2018-7631.

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There is a significant surge in the development of water repellant (superhydrophobic), oil repellent (superoleophobic) surfaces. Though these surfaces are well studied for air medium (inviscid), still there is a lack of fundamental understanding of wetting behavior in presence of surrounding viscous medium. In the present work, we investigate the wetting behaviour of water drops on a PMMA substrate surrounded by viscous oil medium for a wide range of viscosity ratio. The sessile drop is generated at the needle tip (J-needle for denser oil) close to the PMMA substrate to initiate the spreading of a water drop on the substrate. Experimentally measured contact angle at static equilibrium can well interpret the wetting behaviour of water drop on PMMA substrate placed in oil (surrounding medium). It is also observed that the theoretical values of water (drop)-oil and oil (drop)-water system satisfy the Young’s equation of two liquid system, but certain percentage errors are observed when compared to experimental results. These differences are interpreted in terms of interfacial energies of the two-liquid systems. In addition, ‘complementary hysteresis’ model recently put forward by Ozkan et al. [Surf. Topogr.: Metrol. Prop.2017,5,024002] is modified to study the wetting characteristics. Finally, based on the comparison of experimental and theoretical values, a short perspective is provided on the potential of a stable thin lubricant film under the droplet that changes the wetting characteristics of the substrate.
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Varanasi, Kripa K., Tao Deng, Ming F. Hsu, and Nitin Bhate. "Wetting Hysteresis, Metastability, and Droplet Impact on Superhydrophobic Surfaces." In ASME 2009 InterPACK Conference collocated with the ASME 2009 Summer Heat Transfer Conference and the ASME 2009 3rd International Conference on Energy Sustainability. ASMEDC, 2009. http://dx.doi.org/10.1115/interpack2009-89350.

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We study the wetting energetics and wetting hysteresis of sessile and impacting water droplets on superhydrophobic surfaces as a function of surface texture and surface energy. For sessile drops, we find three wetting regimes on these surfaces: equilibrium Cassie at small feature spacing, equilibrium Wenzel at large feature spacing, and an intermediate state at medium feature spacing. We observe minimum wetting hysteresis not on surfaces that exhibit Cassie wetting but rather on surfaces in the intermediate regime. We argue that droplets on these surfaces are metastable Cassie droplets whose internal Laplace pressure is insufficient to overcome the energy barrier required to homogeneously wet the surface. These metastable Cassie droplets show superior roll-off properties because the effective length of the contact line that is pinned to the surface is reduced. We develop a model that can predict the transition between the metastable Cassie and Wenzel regimes by comparing the Laplace pressure of the drop to the capillary pressure associated with the wetting-energy barrier of the textured surface. In the case of impacting droplets the water hammer and Bernoulli pressures must be compared with the capillary pressure. Experiments with impacting droplets show very good agreement with this simple pressure-balance model.
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Walls, Daniel, and Gerald Fuller. "Video: Phase Equilibrium Dynamics of Aqueous Dextran-Gelatin Solutions in the Shape Evolution of Sessile Drops." In 69th Annual Meeting of the APS Division of Fluid Dynamics. American Physical Society, 2016. http://dx.doi.org/10.1103/aps.dfd.2016.gfm.v0065.

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Varanasi, Kripa K., Adam Paxson, Katherine Smyth, Hyuk-min Kwon, and Tao Deng. "Droplet Impingement and Wetting Hysteresis on Textured Hydrophobic Surfaces." In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-22722.

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We study the wetting energetics and wetting hysteresis of sessile and impacting water droplets on superhydrophobic surfaces as a function of surface texture and surface energy. Detailed experiments tracking contact line motion simultaneously with contact angle provides new insights on the wetting hysteresis, stick-slip behavior and dependence on contact line velocity. For sessile drops, we find three wetting regimes on these surfaces: equilibrium Cassie at small feature spacing, equilibrium Wenzel at large feature spacing, and an intermediate state at medium feature spacing. We observe minimum wetting hysteresis not on surfaces that exhibit Cassie wetting but rather on surfaces in the intermediate regime. We argue that droplets on these surfaces are metastable Cassie droplets whose internal Laplace pressure is insufficient to overcome the energy barrier required to homogeneously wet the surface. These metastable Cassie droplets show superior roll-off properties because the effective length of the contact line that is pinned to the surface is reduced. We develop a model that can predict the transition between the metastable Cassie and Wenzel regimes by comparing the Laplace pressure of the drop to the capillary pressure associated with the wetting-energy barrier of the textured surface. In the case of impacting droplets the water hammer and Bernoulli pressures must be compared with the capillary pressure. Experiments with impacting droplets show very good agreement with this simple pressure-balance model.
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Reports on the topic "Sessile Drops"

1

Bullard, Jeffrey W. Thermodynamics of sessile drops on a rigid substrate:. Gaithersburg, MD: National Institute of Standards and Technology, 2005. http://dx.doi.org/10.6028/nist.ir.7272.

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Marín Boyero, Adrián, and Miguel Angel Rodriguez Valverde. Shear adhesion of a sessile drop under a centrifugal field. Fundación Avanza, May 2023. http://dx.doi.org/10.60096/fundacionavanza/1542022.

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Popova, Lidia, and Stefan Todorov. Effect of Water Filtration on CAE Distribution of a Sample Sessile Drop. "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences, May 2018. http://dx.doi.org/10.7546/crabs.2018.05.03.

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