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Автор: Grafiati
Опубліковано: 6 вересня 2023

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Статті в журналах з теми "Interacting sprays"

1

Gai, Guodong, Abdellah Hadjadj, Sergey Kudriakov, Stephane Mimouni, and Olivier Thomine. "Numerical Study of Spray-Induced Turbulence Using Industrial Fire-Mitigation Nozzles." Energies 14, no. 4 (February 20, 2021): 1135. http://dx.doi.org/10.3390/en14041135.

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A numerical investigation of the spray-induced turbulence generated from industrial spray nozzles is carried out to better understand the roles of the nozzle spray on the fires or explosions in different accidental scenarios. Numerical simulations are first validated against experimental data in the single nozzle case using the monodisperse and polydisperse assumption for droplet diameters. The polydispersion of the nozzle spray is proven to be necessary to correctly predict the gas and droplet velocities. The turbulent kinetic energy has dominant values inside the spray cone, decreases rapidly with the vertical distance from the spray nozzle, and is strongly affected by the spray droplet diameter. On the contrary, the integral length scale is found to have high values outside the spray cone. Two interacting sprays injected from different nozzles are then investigated numerically using the validated polydisperse model. The water sprays generated from such industrial nozzles can generate turbulence of high intensity in the near-nozzle region, and this intensity decreases with the distance from the nozzles. A better understanding of the turbulence generated by the spray system can be beneficial for the evaluation of several important phenomena such as explosion enhancement. The guideline values obtained from this investigation of single and double nozzles can be useful for large-scale numerical simulations.
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2

Rudoff, R. C., M. J. Houser, and W. D. Bachalo. "Experiments on Spray Interactions in the Wake of a Bluff Body." Journal of Engineering for Gas Turbines and Power 110, no. 1 (January 1, 1988): 86–93. http://dx.doi.org/10.1115/1.3240091.

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The dynamics of spray drop interaction within the turbulent wake of a bluff body were investigated using the Aerometrics Phase Doppler Particle Analyzer, which determines both drop size and velocity. Detailed measurements obtained included spray drop size, axial and radial velocity, angle of trajectory, and size-velocity correlations. The gas-phase flow field was also ascertained via the behavior of the smallest drops. Results showed dramatic differences in drop behavior when interacting with turbulence for the various size classes. Small drops were recirculated in a pair of toroidal vortices located behind the bluff body, whereas the larger drops followed the general direction of the spray cone angle. This was documented via backlit photography. Local changes in number density were produced as a result of lateral convection and streamwise accelerations and decelerations of various drop size classes. The spray field interaction illustrated by these data effectively reveals the complexity associated with the development of the spray and casts some doubts toward attempting to describe sprays via simple integral quantities such as the Sauter mean diameter.
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3

Foissac, A., J. Malet, S. Mimouni, P. Ruyer, F. Feuillebois, and O. Simonin. "Eulerian Simulation of Interacting PWR Sprays Including Droplet Collisions." Nuclear Technology 181, no. 1 (January 2013): 133–43. http://dx.doi.org/10.13182/nt13-a15762.

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4

Ghasemi, Abbas, Aaron Pereira, Xianguo Li, and Yi Ren. "Multi-plume sprays interacting with subsonic compressible gas jets." Applied Energy 190 (March 2017): 623–33. http://dx.doi.org/10.1016/j.apenergy.2017.01.008.

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5

Cengiz, Cengizhan, and Salih Ozen Unverdi. "A CFD Study on the Effects of Injection Timing and Spray Inclusion Angle on Performance and Emission Characteristics of a DI Diesel Engine Operating in Diffusion-Controlled and PCCI Modes of Combustion." Energies 16, no. 6 (March 20, 2023): 2861. http://dx.doi.org/10.3390/en16062861.

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In three-dimensional (3D) computational fluid dynamics (CFD) simulations, the effects of injection timing and spray inclusion angle (SIA) on performance and emissions of diffusion-controlled and Premixed Charge Compression Ignition (PCCI) combustion in part load for a heavy-duty direct injection (HDDI) diesel engine are studied. The start of injection (SOI) of a 146° SIA injector is varied between −70 and −10 °crank angle (°CA) after top dead center (ATDC). For −50 °CA ATDC SOI with various SIAs between 80° and 146°, PCCI combustion reduces mono-nitrogen oxide (NOx) emissions significantly compared to conventional diesel combustion (CDC). Due to incomplete combustion in rich zones formed by droplet–cylinder wall interaction, early wide SIA injection deteriorates combustion efficiency (CE) and Indicated Mean Effective Pressure (IMEP) and increases soot and carbon monoxide (CO) emissions. Narrow-angle sprays interacting with the piston bowl elevate CE and IMEP and decrease soot and CO emissions but increases NOx emissions. Optimal combustion is achieved by avoiding fuel droplet–cylinder wall interaction. By spray-targeting at the stepped lip of the piston bowl, 100° SIA and −50 °CA ATDC SOI yield, respectively, the highest CE and IMEP: 97.8% and 3.37 bar and the lowest soot and CO emissions: 33.5 and 2.2 ppm, with acceptable NOx emissions.
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6

Sinko, K. M., D. Pushka, and B. Chehroudi. "VISUALIZATION OF INTERACTING PILOT AND MAIN DIESEL-TYPE SPRAYS IN AN ENGINE." Journal of Flow Visualization and Image Processing 2, no. 1 (1995): 93–112. http://dx.doi.org/10.1615/jflowvisimageproc.v2.i1.80.

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7

Dunn, Patrick F., and Stephen R. Snarski. "Velocity component and diameter distribution characteristics of droplets within two interacting electrohydrodynamic sprays." Physics of Fluids A: Fluid Dynamics 3, no. 3 (March 1991): 492–94. http://dx.doi.org/10.1063/1.858108.

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8

Patel, Rajesh, Pengfei He, Bo Zhang, and Chao Zhu. "Transport of interacting and evaporating liquid sprays in a gas–solid riser reactor." Chemical Engineering Science 100 (August 2013): 433–44. http://dx.doi.org/10.1016/j.ces.2013.01.005.

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9

Chehroudi, Bruce, K. M. Sinko, W. J. Minkowycz, and S. Shih. "INTERACTING-SPRAYS INJECTION: A NEW CONCEPT FOR NOx AND SMOKE REDUCTION IN DIESEL ENGINES." Atomization and Sprays 8, no. 6 (1998): 673–90. http://dx.doi.org/10.1615/atomizspr.v8.i6.40.

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10

Gao, Jian, Mario F. Trujillo, and Suraj Deshpande. "Numerical Simulation of Hollow-Cone Sprays Interacting with Uniform Crossflow for Gasoline Direct Injection Engines." SAE International Journal of Engines 4, no. 2 (September 11, 2011): 2207–21. http://dx.doi.org/10.4271/2011-24-0007.

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Дисертації з теми "Interacting sprays"

1

Mirza, Muhammad Riaz. "Studies of diesel sprays interacting with cross-flows and solid boundaries." Thesis, University of Manchester, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315666.

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2

Jones, Alwyn. "The interaction of flames with water sprays." Thesis, Cardiff University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338152.

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3

Pawlowski, Adam. "Experimental investigation of interaction process between diesel sprays." Aachen Shaker, 2008. http://d-nb.info/992707420/04.

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4

Cutter, Paul. "Diesel spray characteristics, spray/wall interaction and heat transfer." Thesis, Imperial College London, 1996. http://hdl.handle.net/10044/1/7524.

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5

Jones, Stephen Huw Meredith. "Interaction of detonation waves with foils and water sprays." Thesis, Cardiff University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.255842.

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6

Jackman, L. A. "Sprinkler spray interactions with fire gases." Thesis, London South Bank University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.482025.

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7

Pawlowski, Adam [Verfasser]. "Experimental Investigation of Interaction Processes Between Diesel-Sprays / Adam Pawlowski." Aachen : Shaker, 2009. http://d-nb.info/116131105X/34.

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8

Palumbo, John C., F. J. Reyes, L. Carey, A. Amaya, and L. Ledesma. "Interactions Between Insecticides, Spray pH, & Adjuvants." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2001. http://hdl.handle.net/10150/214912.

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Studies were conducted in the laboratory to investigate how the addition of a insecticides to two sources of Colorado River water would effect the pH of spray mixtures. In addition, we were curious what the effects of various labeled concentrations of buffers, acidifiers, spreader/stickers, and foliar nutrient sprays would have on the pH of spray water. Results showed that in most cases, spray concentration remained alkaline following addition of insecticides and adjuvants, with variations occurring primarily for the OPs. Buffering agents dramatically lowed pH at concentration greater than 0.25% v/v. Studies were also designed to evaluate the knockdown and residual mortality of Success against worms when applied in an acidic spray solution. Bioassays of larval mortality on field-treated foliage showed that knockdown mortality was not affected, but residual efficacy was significantly reduced when Success was applied using acidic (pH 4.2) spray solutions.
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9

Deprédurand, Valérie. "Approche expérimentale de l'évaporation de sprays de combustibles multicomposant." Thesis, Vandoeuvre-les-Nancy, INPL, 2009. http://www.theses.fr/2009INPL060N/document.

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Des diagnostics optiques non intrusifs ont été utilisés afin d’investiguer les mécanismes gouvernant l’évaporation de trains de gouttes en interaction ou de sprays. Une technique basée sur la fluorescence induite par laser à deux couleurs (2cLIF) du pyrrométhène 597-8C9 ensemencé en très faible concentration dans le liquide à étudier a été développée pour obtenir la température moyenne de gouttes combustibles mono et bicomposant (alcanes, alcool, cétones) évoluant dans un train de gouttes monodisperse. En parallèle, l’évolution du diamètre des gouttes a été déterminée par interférométrie en diffusion avant. L’évolution temporelle de la température et du diamètre des gouttes en évaporation a été mesurée pour une large gamme de paramètres d’injection et d’interaction. Plusieurs combustibles présentant différentes volatilités ont ainsi été étudiés dans une chambre d’évaporation. Les paramètres caractérisant les transferts de chaleur et de masse représentés par les nombres de Nusselt et de Sherwood, intervenant dans le mécanisme d’évaporation des gouttes en interaction, ont été calculés à partir des données expérimentales, ce qui a permis la caractérisation de l’influence des interactions entre gouttes sur les transferts, en mettant en évidence un effet notable de la volatilité du combustible. Ensuite la technique de 2cLIF a été étendue à la mesure de la température moyenne d’un spray de gouttes binaires composées d’un mélange n-décane / 3-pentanone et injecté dans un écoulement turbulent chauffé. Le développement d’une technique de couplage de la technique LIF avec la granulométrie phase Doppler (PDA) a permis la mesure de températures par classe de taille de goutte
Non intrusive optical diagnostics are used in order to investigate the mechanisms that govern the droplets evaporation. A new technique based on 2-colours laser-induced fluorescence (LIF) of the pyrromethene 597-8C9 was developed to obtain the mean temperature of evaporating bicomponent fuel droplets in a linear monodisperse droplet stream. In parallel size evolution of the droplet was measured thanks to forward scattering methods. Data on evaporating and interacting droplet streaming linearly have been collected for different injection parameters and several monocomponent fuels (alcohol, ketones, alkanes) that exhibit different volatilities and bicomponent fuels (mixture of n-decane and 3-pentanone), in a temperature controlled evaporation chamber. Heat and mass transfers parameters (Nusselt and Sherwood numbers) involved in the evaporation process of interacting droplets are inferred from the experimental data. The result exhibits a strong influence of the volatilities of the fuel on the effect of the interaction on heat and mass transfers. Then the 2-colours LIF technique was extended to measure the mean temperature within a spray made of bicomponent droplets (n-decane / 3-pentanone), injected in a hot air flow where the turbulence and boundary conditions are controlled. By means of a coupling with the PDA (Particle Dynamic Analyser), temperature for each size of droplets was determined
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10

Sibra, Alaric. "Modélisation et étude de l’évaporation et de la combustion de gouttes dans les moteurs à propergol solide par une approche eulérienne Multi-Fluide." Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLC019/document.

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En propulsion solide, l'ajout de particules d'aluminium dans le propergol améliore de façon significative les performances du moteur grâce à une augmentation sensible de la température de chambre. La présence de gouttes d'aluminium et de résidus d'alumine de différentes tailles et en quantité importante a un impact notoire sur le fonctionnement du moteur. Dans cette optique, nous souhaitons obtenir une meilleure prévision de la stabilité de fonctionnement en cas de déclenchement d'instabilités d'origine aéroacoustique ou thermoacoustique. Nous visons des calculs plus précis de l'étendue de la zone de combustion, de la chaleur dégagée par la combustion distribuée des gouttes et de la distribution en taille des résidus. Nos efforts ont porté sur la modélisation des échanges entre la phase gazeuse et cette phase dispersée composée de gouttes de nature et de taille très diverses. Le paramètre taille pilotant la dynamique du spray et le couplage avec le gaz, le suivi précis des changements de taille est un enjeu majeur.Dans cette contribution, nous avons choisi une approche cinétique pour la description des sprays polydisperses. L'équation cinétique de Williams-Boltzmann utilisée pour suivre l'évolution des propriétés du spray est résolue par une approche eulérienne. Les méthodes Multi-Fluide (MF) traitent naturellement les changements de taille tels que l'évaporation et la coalescence. Ces méthodes reposent sur une intégration continue de la variable taille sur des intervalles fixes appelés sections sur lesquels nous pouvons dériver des systèmes d'équations de conservation. Chaque système est vu comme un fluide qui est en couplage fort avec la phase gazeuse via des termes sources.Nous avons travaillé sur une méthode MF à deux moments en taille basée sur une famille de fonctions de forme polynomiale pour reconstruire la distribution en taille au sein des sections. Cette approche d'ordre deux en temps et en espace s'avère performante car elle décrit avec précision l'évolution de la distribution avec un nombre modéré de sections. Un travail original a été mené afin d'étendre l'approche MF à des gouttes bicomposants. Cette méthode ouvre la voie à des modèles de combustion des gouttes d'aluminium plus représentatifs. Dans le contexte des simulations instationnaires, nous avons porté une attention particulière à l'emploi d'une stratégie numérique robuste et précise pour le couplage entre les phases modélisées par une approche Euler-Euler. Nous montrons qu'une méthode de splitting séparant le traitement du transport des phases gazeuse/dispersée de celui des termes sources est particulièrement adaptée pour la résolution d'un problème multi-échelle spatial et temporel. Dans la mesure où les conditions de réalisabilité sur les moments en taille des méthodes MF ne sont pas garanties avec des méthodes d'intégration traditionnelles, nous avons développé des schémas innovants pour l'intégration des termes sources. Les travaux proposés dans cette contribution répond à deux exigences : 1- un ratio coût/précision attractif pour des simulations industrielles 2- une facilité d'implémentation des méthodes et une modularité assurant la pérennisation des codes industriels. Ces développements ont d'abord été vérifiés à l'aide d'un code ad hoc ; des cas test d'étude d'acoustique diphasique linéaire ont notamment souligné la pertinence de la technique de splitting pour restituer avec précision les interactions spray-acoustique. Les nouvelles méthodes ont ensuite été implémentées et validées au sein du code multi-physique CEDRE développé à l'ONERA. Des calculs de propulsion solide sur des configurations moteur réalistes ont finalement mis en évidence le niveau de maturité atteint par les méthodes eulériennes pour décrire avec fidélité la dynamique des sprays polydisperses. Les résultats de ces simulations ont mis en avant la sensibilité des niveaux d'instabilités en fonction de la distribution en taille des gouttes d'aluminium et des résidus
The addition of a significant mass fraction of aluminum particle in the propellant of Solid Rocket Motors improves performance through an increase of the temperature in the combustion chamber. The distributed combustion of aluminum droplets in a portion of the chamber yields a massive amount of disperse aluminum oxide residues with a large size spectrum, called a polydisperse spray, in the entire volume. The spray can have a significant impact on the motor behavior and in particular on the onset/damping of instability. When dealing with aeroacoustical and thermoacoustical instabilities, the faithful prediction of the interactions between the gaseous phase and the spray is a determining step for understanding the physical mechanisms and for future solid rocket motor optimization. In such a harsh environment, experimental measurements have a hard time providing detailed explanation of the physical mechanisms and one has to resort to numerical simulation. For such a purpose, the distributed combustion zone and thermal profile therein, the heat generated by the combustion of the dispersed droplets and the large size distribution of the aluminum oxide residues and its coupling with he gaseous phase hydrodynamic and acoustic fields have to be accurately reproduced through a proper level of modeling and a high fidelity simulation including a precise resolution of size polydispersity, which is a key parameter.In this contribution, we choose a kinetic approach for the description of polydisperse sprays. The Williams-Boltzmann Equation is used to model the disperse phase and we derive a fully Eulerian approach through moment methods. The Multi-Fluid (MF) methods naturally treat droplet size evolution through phenomena such as evaporation and coalescence. These methods rely on the conservation of size moments on fixed intervals called sections and yield systems of conservation laws for a set of "fluids" of droplet of various sizes, which is strongly coupled with the gas phase via source terms. We derive a new optimal and flexible Two Size Moment MF method based on a family of polynomial reconstruction functions to describe the size distribution in the sections, which is second order accurate and particularly efficient at describing accurately the evolution of the size distribution with a moderate number of sections. An original work is also conducted in order to extend this approach to two-component droplets. For size moment MF methods, realizability of the moments is a crucial issue. Thus, we have developed innovative schemes for integrating source terms in moment conservation equations describing transport in phase space. This method enables the use of more representative aluminum droplet combustion models, and leads to more advanced studies of the distributed combustion zone. Moreover, for unsteady two-phase flow simulations, we have developed a robust and accurate coupling strategy between phases that are modeled by a fully Eulerian approach based on operator splitting in order to treat such spatial and temporal very multi-scale problems with reasonable computational time. All the proposed developments have been carried out following two criteria : 1- an attractive cost/accuracy ratio for industrial simulations in the context of high fidelity simulations 2- a preservation of industrial code legacy. Verification of the models and methods have been conducted first using an in-house reseach code and then in the context of a two-phase acoustic study thus emphasizing the relevance of the splitting technique to capture accurately spray-acoustic interactions
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Книги з теми "Interacting sprays"

1

Lamanna, Grazia, Simona Tonini, Gianpietro Elvio Cossali, and Bernhard Weigand, eds. Droplet Interactions and Spray Processes. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-33338-6.

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2

Lepota, N. J. Modeling of spray/wall interactions. Manchester: UMIST, 1996.

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3

Bilanin, Alan J. Interaction of spray aircraft wake with convective surface winds in hilly terrain. Davis, CA: USDA Forest Service, 1996.

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4

United States. National Aeronautics and Space Administration., ed. Droplet-turbulence interactions in sprays exposed to supercritical environmental conditions: Final report, NASA grant, #NAG8-160. [Washington, DC: National Aeronautics and Space Administration, 1993.

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5

Dynamics, Inc Continuum. Field study of interaction of spray aircraft wake with convective surface winds in hilly terrain. Davis, CA: United States Department of Agriculture, Forest Service, Forest Health Protection, Forest Health Technology Enterprise Team, 1996.

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6

Rudolph, Martin. Nanoparticle-polymer-composites: The solution and spray drying process with an emphasis on colloidal interactions. Freiberg: Technische Universität Bergakademie, 2013.

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7

Gerhard, Rigoll, ed. Mensch-Maschine-Kommunikation: Grundlagen von sprach- und bildbasierten Benutzerschnittstellen. Berlin: Springer, 2010.

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8

Schneider, V. A Two Dimensional Hydrodynamic Code for the Interaction of Intense Heavy Ion Beams with Matter Based on the Code Conchas Spray. Darmstadt: Gesellschaft fur Schwerionenforschung, 1988.

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9

Nolda, Sigrid. Sprachinteraktion in Prüfungen: Eine qualitative Untersuchung zum Sprach- und Interaktionsverhalten von Prüfern und Kandidaten in Zertifikatsprüfungen im Bereich Fremdsprachen. Frankfurt/Main: Auslieferung, Pädagogische Arbeitsstelle, Deutscher Volkshochschul-Verband, 1990.

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10

Shakespeares dramaturgische Perspektive: Die theatrale Grammatik Erving Goffmans als Modell strategischer Interaktion in den Komödien und Historien. Heidelberg: Winter, 2002.

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Частини книг з теми "Interacting sprays"

1

Greenberg, J. B. "Interacting Sprays." In Handbook of Atomization and Sprays, 457–76. Boston, MA: Springer US, 2010. http://dx.doi.org/10.1007/978-1-4419-7264-4_22.

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2

Schmidt, Johannes Benedikt, Jan Breitenbach, Ilia V. Roisman, and Cameron Tropea. "Interaction of Drops and Sprays with a Heated Wall." In Fluid Mechanics and Its Applications, 333–53. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-09008-0_17.

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AbstractSpray-wall interactions take place in many technical applications such as spray cooling, combustion processes, cleaning, wetting of surfaces, coating and painting, etc. The outcome of drop impact onto hot surfaces depends on a variety of parameters like for example material and thermal properties of the liquid and wall, substrate wetting properties, surrounding conditions which determine the saturation temperature, spray impact parameters and surface temperature. The aim of the current project is to improve knowledge of the underlying physics of spray-wall interactions. As an important step towards spray impact modeling first a single drop impact onto hot substrates is considered in detail. Various regimes of single drop impact, such as thermal atomization, magic carpet breakup, nucleate boiling and thermosuperrepellency, observed at different wall temperatures, ambient pressures and impact velocities, have been investigated experimentally and modelled theoretically during the project period. The heat flux, an important parameter for spray cooling, has been modeled not only for single drop impacts but also for sprays within many regimes. The models show a good agreement with experimental data as well as data from literature.
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3

Fauchais, Pierre L., Joachim V. R. Heberlein, and Maher I. Boulos. "Gas Flow–Particle Interaction." In Thermal Spray Fundamentals, 113–226. Boston, MA: Springer US, 2013. http://dx.doi.org/10.1007/978-0-387-68991-3_4.

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4

Shaw, G. B., R. B. McKercher, and R. Ashford. "The effect of spray volume on spray partitioning between plant and soil." In Plant and Soil Interfaces and Interactions, 323–31. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3627-0_21.

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5

Walzel, P., A. Mescher, and J. Kamplade. "Experimental Evaluation and Control of Interaction of Gas Environment and Rotary Atomized Spray for Production of Narrow Particle Size Distribution." In Process-Spray, 903–40. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-32370-1_22.

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Sarkar, Sourav, Joydeep Munshi, Santanu Pramanik, Achintya Mukhopadhyay, and Swarnendu Sen. "Interaction of Water Spray with Flame." In Energy for Propulsion, 151–86. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-7473-8_7.

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Heinemann, Moritz, Filip Sadlo, and Thomas Ertl. "Interactive Visualization of Droplet Dynamic Processes." In Fluid Mechanics and Its Applications, 29–46. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-09008-0_2.

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AbstractThis article presents an overview of visual analysis techniques specifically developed for high-resolution direct numerical multiphase simulations in the droplet dynamic context. Visual analysis of such data covers a large range of tasks, starting from observing physical phenomena such as energy transport or collisions for single droplets to the analysis of large-scale simulations such as sprays and jets. With an increasing number of features, coalescence and breakup events might happen, which need to be visually presented in an interactive explorable way to gain a deeper insight into physics. But also the task of finding relevant structures, features of interest, or a general dataset overview becomes non-trivial. We present an overview of new approaches developed in our SFB-TRR 75 project A1 covering work from the last decade to the current work-in-progress. They are the basis for relevant contributions to visualization research as well as useful tools for close collaborations within the SFB.
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Dejonckere, P. H. O. "Aspecten van de interactie functie – orgaan in de stempathologie." In Handboek Stem– Spraak– Taalpathologie, 483–86. Houten: Bohn Stafleu van Loghum, 1999. http://dx.doi.org/10.1007/978-90-313-8642-0_58.

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Pekshev, P. Yu, A. O. Naumkin, B. S. Rubtsov, and O. P. Solonenlco. "Gas-Metal Interaction by Ti Plasma-Spray Formation." In Plasma Jets in the Development of New Materials Technology, 321–34. London: CRC Press, 2023. http://dx.doi.org/10.1201/9780429070938-30.

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Leischner, Vojtěch, and Zdenek Mikovec. "Video Projection on Transparent Materials." In Digital Interaction and Machine Intelligence, 145–52. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-11432-8_14.

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AbstractWe propose a new coating for light projection on transparent materials that can open new possibilities for design. What we often struggle with is the lighting of clear glass. By definition, clear glass lets most of the light pass through. We have found a way to turn glass surfaces opaque or transparent by using ultraviolet (UV) fluorescence coating. In combination with a UVA light source, we can project the dynamic content onto a glass surface treated with a special coating that transforms the UVA light into visible light. The added benefit of such a coating is that it can be applied to any organically shaped surface using a spray gun, not just flat surfaces. Another advantage is that the light source is nearly invisible to the human eye, especially with a UV light pass-through filter. We have created a prototype with a modified overhead projector to measure the light characteristics and documented the steps to reproduce our results.
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Тези доповідей конференцій з теми "Interacting sprays"

1

Chehroudi, B., K. M. Sinko, and S. Shih. "A Novel Approach for Simultaneous NOx and Smoke Reduction: Interacting-Sprays Injection." In Future Transportation Technology Conference & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1996. http://dx.doi.org/10.4271/961678.

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2

Wei, Sheng, Brandon Sforzo, and Jerry Seitzman. "Fuel Composition Effects on Forced Ignition of Liquid Fuel Sprays." In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-77196.

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In gas turbine combustors, ignition is achieved by using sparks from igniters to start a flame. The process of sparks interacting with fuel/air mixture and creating self-sustained flames is termed forced ignition. Physical and chemical properties of a liquid fuel can influence forced ignition. The physical effects manifest through processes such as droplet atomization, spray distribution, and vaporization rate. The chemical effects impact reaction rates and heat release. This study focuses on the effect of fuel composition on forced ignition of fuel sprays in a well-controlled flow with a commercial style igniter. A facility previously used to examine prevaporized, premixed liquid fuel-air mixtures is modified and employed to study forced ignition of liquid fuel sprays. In our experiments, a wall-mounted, high energy, recessed cavity discharge igniter operating at 15 Hz with average spark energy of 1.25 J is used to ignite liquid fuel spray produced by a pressure atomizer located in a uniform air coflow. The successful outcome of each ignition events is characterized by the (continued) presence of chemiluminescence 2 ms after spark discharge, as detected by a high-speed camera. The ignition probability is defined as the fraction of successful sparks at a fixed condition, with the number of events evaluated for each fuel typically in the range 600–1200. Ten fuels were tested, including standard distillate jet fuels (e.g., JP-8 and Jet-A), as well as many distillate and alternative fuel blends, technical grade n-dodecane, and surrogates composed of a small number of components. During the experiments, the air temperature is controlled at 27 C and the fuel temperature is controlled at 21 C. Experiments are conducted at a global equivalence ratio of 0.55. Results show that ignition probabilities correlate strongly to liquid fuel viscosity (presumably through droplet atomization) and vapor pressure (or recovery temperature), as smaller droplets of a more volatile fuel would lead to increased vaporization rates. This allows the kernel to transition to a self-sustained flame before entrainment reduces its temperature to a point where chemical rates are too slow. Chemical properties of the fuel showed little influence, except when the fuels had similar physical properties. This result demonstrates that physical properties of liquid fuels have dominating effects on forced ignition of liquid fuel spray in coflow air.
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Hutcheson, Paul S., John W. Chew, Rex B. Thorpe, and Colin Young. "Assessment of Models for Liquid Jet Breakup." In ASME Turbo Expo 2008: Power for Land, Sea, and Air. ASMEDC, 2008. http://dx.doi.org/10.1115/gt2008-50649.

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For many gas turbine architectures a failure modes and effects analysis identifies a potential mode in which failure of an oil transfer pipe could result in oil leakage into the secondary air system. Such an event would result in a complex two-phase interacting flow. The atomisation and transport of the oil within the air system is of interest, but is difficult to predict. Available data for the droplet size resulting from jet breakup in crossflow are limited. A dimensional analysis shows jet breakup in a crossflow to involve many factors. The atomisation process has been shown experimentally to include many physical processes and is still not completely understood. Currently, the most practical method of modelling these breakup processes in sprays is by using a CFD package with a set of sub-models within an Euler-Lagrangian (discrete-droplet) approach. The strengths and weaknesses of each of these sub-models cannot reasonably be tested when used in combination with other approximations to model a spray in crossflow. The purpose of this study was to assess various submodels for liquid breakup with a series of simple test cases.
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Magnusson, Alf, and Sven Andersson. "An Experimental Investigation of Spray-Wall Interaction of Diesel Sprays." In SAE World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2009. http://dx.doi.org/10.4271/2009-01-0842.

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Fincke, J. R., W. D. Swank, and D. C. Haggard. "Inflight Behavior of Dissimilar Co-Injected Particles in the Spraying of Metal-Ceramic Functionally Graded Materials." In ITSC 1997, edited by C. C. Berndt. ASM International, 1997. http://dx.doi.org/10.31399/asm.cp.itsc1997p0527.

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Abstract In the spraying of functionally graded coatings the particle ensemble delivered to the substrate can vary from a relatively low melting point metallic particle to a significantly higher melting point ceramic particle. At various stages in the spray process the particle ensemble can be either predominantly metallic, ceramic, or an intermediate combination. For co-injected particles the mixtures do not behave as a simple linear superposition of the spray patterns of the individual particle types. The particle temperature, velocity, size distributions, and pattern characteristics of the resulting spray fields is examined for all ceramic particle sprays (ZrO2), all metallic particle sprays (NiCrAlY), and for a 1:1 mixture. The major particle-particle interaction occurs in the injector itself and results in a modified spray pattern which is different from that of either material sprayed alone. The particle velocity distributions generally exhibit a bimodal nature which is dependent on the size and density of the injected particles.
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Chin, J. S., N. K. Rizk, and M. K. Razdan. "Experimental Investigation of Hybrid Airblast Atomizer." In ASME 1996 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/96-gt-464.

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As a means of overcoming the difficulties of achieving a satisfactory fuel atomization over the entire range of engine operation, both airblast forces and high pressure fuel injection are used in one hybrid atomizer design. The objectives of the present effort are to further improve the understanding of the important process of spray interaction in the hybrid atomizer flowfield, and to develop a relatively simple calculation approach that can relate the net effect of the interaction to the atomizer operating conditions. The ratio of the calculated average SMD for both the pilot and main prefilming device of the hybrid atomizer, each operating separately, to the SMD measured for the overall spray, obtained when both fuel devices were operating simultaneously, was used as an indication of the interaction between the two sprays. The experimental investigation demonstrated that stronger interaction between the pilot pressure nozzle spray and the prefilming main spray of the hybrid airblast atomizer occurred at higher pilot fuel pressure, larger pilot spray angle, or lower air pressure drop. It was also noticed that there was an optimum value of main fuel pressure, beyond which a decline in spray interaction was observed. The results indicated that by carefully selecting the pilot spray angle and flow capacities of the atomization devices, satisfactory atomization could be achieved even at lower air pressure drop. The interaction between the pilot and main sprays of the hybrid atomizer in configurations that utilized air swirlers surrounding the atomizer, was strongly dependent on swirler geometry. The extent of the interaction was attributed to changes in the air flowfield around and between the two sprays and the main filming process, all significantly affected the degree of utilization of the airblast effects.
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Darbandi, Masoud, Ali Fatin, and Gerry E. Schneider. "Careful Parameter Study to Enhance the Effect of Injecting Heavy Fuel Oil Into a Crossflow Using Numerical Approaches." In ASME 2018 5th Joint US-European Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/fedsm2018-83207.

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The flow and spray parameters can have noticeable roles in heavy fuel oil (HFO) spray finesse. As known, the interaction between droplets and cross flow should be considered carefully in many different industrial applications such as the process burners and gas turbine combustors. So, it would be so important to investigate the effect of injecting HFO into a crossflow more subtly. In this work, the effects of various flow and spray parameters on the droplet breakup and dispersion parameters are investigated numerically using the finite-volume-element method. The numerical method consists of a number of different models to predict the droplets breakup and their dispersion into a cross flow including the spray-turbulence interaction one. An Eulerian–Lagrangian approach, which suitably models the interaction between the droplets and turbulence, and also models the droplets secondary breakup is used to investigate the interactions between the flow and the droplet behaviors. After validating the computational method via comparing them with the data provided by the past researches, four test cases with varying swirl number, air axial velocity, droplet size, and fuel injection velocity are examined to find out the effects of preceding parameters on some spray characteristics including the droplets path, sauter mean diameter (SMD), and dispersed phase mass concentration. The results show that the droplets inertia and the flow velocity magnitude have significant effects on spray characteristics. As the droplets become more massive, the deflection of spray in flow direction becomes less. Also, increasing of flow velocity causes more deflection for sprays with the same droplet sizes.
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Bernard, Ronan, Patrick Foltyn, Anne Geppert, Grazia Lamanna, and Bernhard Weigand. "Generalized analysis of the deposition/splashing limit for one- and two-component droplet impacts upon thin films." In ILASS2017 - 28th European Conference on Liquid Atomization and Spray Systems. Valencia: Universitat Politècnica València, 2017. http://dx.doi.org/10.4995/ilass2017.2017.4810.

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Single drop impacts on thin liquid layers are of particular interest because of the ejection of secondary droplets, theso-called splashing. Only a few studies handle the deposition/splashing limit for two-component interaction, where the liquid properties of the impacting drop and wall film differ significantly.This study aims at identifying a unified approach for one- and two-component interactions to determine the deposi- tion/splashing limit. Therefore, a large database of both interactions is considered, which includes data from litera- ture for one-component interactions plus the following binary combinations: hyspin-hexadecane, diesel-hexadecane and diesel-motor oil. Furthermore, a systematic study of two-component interactions with several silicon oils and hexadecane is performed. To map the outcomes, the Ohnesorge number Oh and the Reynolds number Re calcu- lated with arithmetically averaged fluid properties between droplet and wall film fluid are chosen. The dimensions- less film thickness δ is added to form a 3D plot, where one- and two-component experiments are combined.Existing correlations from the literature are revised regarding both interactions and their consistency is checked. The investigated range of high viscosity fluids allow us to propose an improvement of the correlation for high Oh. Our results show that the arithmetically averaged fluid properties lead to a good repartition of both one- and two- components interactions toward the deposition/splashing limit. They also corroborate the previous findings that an increase of δ inhibits splashing but its influence is decreasing with increasing Oh.DOI: http://dx.doi.org/10.4995/ILASS2017.2017.4810
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Lampa, Aljoscha, and Udo Fritsching. "Impact of Droplet Clustering on Heat Transfer in Spray Processes." In ASME 2014 4th Joint US-European Fluids Engineering Division Summer Meeting collocated with the ASME 2014 12th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/fedsm2014-21562.

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The transient state and unsteadiness of sprays from twin-fluid atomizers in enclosures is analysed. The investigated flows show differently scaled spray structures. Especially the meso-scale droplet clustering and coherent vortex structures in the gas are quantified. Droplet clustering can be caused by pulsating liquid disintegration procedures or droplet interaction with eddy structures in the gas. The preferential concentration of droplets influences the heat and mass transfer for individual droplets within the spray cone. This effect of droplet clustering is of interest for many spray applications, e.g. in automotive spray combustion. This numerical work focuses on the interaction of droplets with shear layer vortices at the spray edge.
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Hou, Shuhai, and David P. Schmidt. "Interaction Mechanisms between Closely Spaced Sprays." In SAE World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2008. http://dx.doi.org/10.4271/2008-01-0946.

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Звіти організацій з теми "Interacting sprays"

1

Faeth, G. M. Drop/Gas Interactions of Dense Sprays. Fort Belvoir, VA: Defense Technical Information Center, November 2001. http://dx.doi.org/10.21236/ada399707.

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Tryggvason, Gretar. Computations of Droplet/Flow Interactions in Sprays. Fort Belvoir, VA: Defense Technical Information Center, October 2001. http://dx.doi.org/10.21236/ada389306.

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3

Pickett, Lyle. Fuel Spray Mixing and Wall Interaction. Office of Scientific and Technical Information (OSTI), May 2021. http://dx.doi.org/10.2172/1783202.

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Hanson, Ronald K. Apparatus for the Study of Shock Wave and Detonation Wave Interactions with Fuel Sprays. Fort Belvoir, VA: Defense Technical Information Center, September 2001. http://dx.doi.org/10.21236/ada389051.

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Andreas, Edgar L. Air-Sea Interaction in High Winds and the Role of Spray. Fort Belvoir, VA: Defense Technical Information Center, September 2000. http://dx.doi.org/10.21236/ada610166.

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Cooper, Leonard Y. Interaction of an isolated sprinkler spray and a two-layer compartment fire environment. Gaithersburg, MD: National Institute of Standards and Technology, 1991. http://dx.doi.org/10.6028/nist.ir.4587.

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Veron, Fabrice. Dynamic Effects of Airborne Water Droplets on Air-Sea Interactions: Sea-Spray and Rain. Fort Belvoir, VA: Defense Technical Information Center, September 2006. http://dx.doi.org/10.21236/ada612095.

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Veron, Fabrice. Dynamic Effects of Airborne Water Droplets on Air-Sea Interactions: Sea-Spray and Rain. Fort Belvoir, VA: Defense Technical Information Center, September 2008. http://dx.doi.org/10.21236/ada532799.

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Veron, Fabrice. Dynamic Effects of Airborne Water Droplets on Air-Sea Interactions: Sea-Spray and Rain. Fort Belvoir, VA: Defense Technical Information Center, September 2007. http://dx.doi.org/10.21236/ada542432.

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Li, Kuichun, Masaki Ido, Yoichi Ogata, Keiya Nishida, Baolu Shi, and Daisuke Shimo. Effect of Spray/Wall Interaction on Diesel Combustion and Soot Formation in Two-Dimensional Piston Cavity. Warrendale, PA: SAE International, October 2013. http://dx.doi.org/10.4271/2013-32-9021.

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