Relevant bibliographies by topics / Droplet Collision

Academic literature on the topic 'Droplet Collision'

Author: Grafiati
Published: 10 December 2022
Last updated: 6 September 2023

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Contents

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Droplet Collision.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Droplet Collision"

1

Li, Xiang-Yu, Axel Brandenburg, Gunilla Svensson, Nils E. L. Haugen, Bernhard Mehlig, and Igor Rogachevskii. "Effect of Turbulence on Collisional Growth of Cloud Droplets." Journal of the Atmospheric Sciences 75, no. 10 (October 2018): 3469–87. http://dx.doi.org/10.1175/jas-d-18-0081.1.

Full text
Abstract:
We investigate the effect of turbulence on the collisional growth of micrometer-sized droplets through high-resolution numerical simulations with well-resolved Kolmogorov scales, assuming a collision and coalescence efficiency of unity. The droplet dynamics and collisions are approximated using a superparticle approach. In the absence of gravity, we show that the time evolution of the shape of the droplet-size distribution due to turbulence-induced collisions depends strongly on the turbulent energy-dissipation rate [Formula: see text], but only weakly on the Reynolds number. This can be explained through the [Formula: see text] dependence of the mean collision rate described by the Saffman–Turner collision model. Consistent with the Saffman–Turner collision model and its extensions, the collision rate increases as [Formula: see text] even when coalescence is invoked. The size distribution exhibits power-law behavior with a slope of −3.7 from a maximum at approximately 10 up to about 40 μm. When gravity is invoked, turbulence is found to dominate the time evolution of an initially monodisperse droplet distribution at early times. At later times, however, gravity takes over and dominates the collisional growth. We find that the formation of large droplets is very sensitive to the turbulent energy dissipation rate. This is because turbulence enhances the collisional growth between similar-sized droplets at the early stage of raindrop formation. The mean collision rate grows exponentially, which is consistent with the theoretical prediction of the continuous collisional growth even when turbulence-generated collisions are invoked. This consistency only reflects the mean effect of turbulence on collisional growth.
APA, Harvard, Vancouver, ISO, and other styles
2

Qian, Lijuan, Jingqi Liu, Hongchuan Cong, Fang Zhou, and Fubing Bao. "A Numerical Investigation on the Collision Behavior of Unequal-Sized Micro-Nano Droplets." Nanomaterials 10, no. 9 (September 3, 2020): 1746. http://dx.doi.org/10.3390/nano10091746.

Full text
Abstract:
Micro-nano droplet collisions are fundamental phenomena in the applications of nanocoating, nano spray, and microfluidics. Detailed investigations of the process of the droplet collisions under higher Weber are still lacking when compared with previous research studies under a low Weber number below 120. Collision dynamics of unequal-sized micro-nano droplets are simulated by a coupled level-set and volume of fluid (CLSVOF) method with adaptive mesh refinement (AMR). The effects of the size ratio (from 0.25 to 0.75) and different initial collision velocities on the head-on collision process of two unequal-sized droplets at We = 210 are studied. Complex droplets will form the filament structure and break up with satellite droplets under higher Weber. The filament structure is easier to disengage from the complex droplet as the size ratio increases. The surface energy converting from kinetic energy increases with the size ratio, which promotes a better spreading effect. When two droplets keep the constant relative velocity, the motion tendency of the droplets after the collision is mainly dominated by the large droplet. On one hand, compared with binary equal-sized droplet collisions, a hole-like structure can be observed more clearly since the initial velocity of a large droplet decreases in the deformation process of binary unequal-sized droplets. On the other hand, the rim spreads outward as the initial velocity of the larger droplet increases, which leads to its thickening.
APA, Harvard, Vancouver, ISO, and other styles
3

Chen, Sisi, Man-Kong Yau, Peter Bartello, and Lulin Xue. "Bridging the condensation–collision size gap: a direct numerical simulation of continuous droplet growth in turbulent clouds." Atmospheric Chemistry and Physics 18, no. 10 (May 25, 2018): 7251–62. http://dx.doi.org/10.5194/acp-18-7251-2018.

Full text
Abstract:
Abstract. In most previous direct numerical simulation (DNS) studies on droplet growth in turbulence, condensational growth and collisional growth were treated separately. Studies in recent decades have postulated that small-scale turbulence may accelerate droplet collisions when droplets are still small when condensational growth is effective. This implies that both processes should be considered simultaneously to unveil the full history of droplet growth and rain formation. This paper introduces the first direct numerical simulation approach to explicitly study the continuous droplet growth by condensation and collisions inside an adiabatic ascending cloud parcel. Results from the condensation-only, collision-only, and condensation–collision experiments are compared to examine the contribution to the broadening of droplet size distribution (DSD) by the individual process and by the combined processes. Simulations of different turbulent intensities are conducted to investigate the impact of turbulence on each process and on the condensation-induced collisions. The results show that the condensational process promotes the collisions in a turbulent environment and reduces the collisions when in still air, indicating a positive impact of condensation on turbulent collisions. This work suggests the necessity of including both processes simultaneously when studying droplet–turbulence interaction to quantify the turbulence effect on the evolution of cloud droplet spectrum and rain formation.
APA, Harvard, Vancouver, ISO, and other styles
4

Xing, Lei, Jinyu Li, Minghu Jiang, and Lixin Zhao. "Dynamic behavior of compound droplets with millimeter-sized particles impacting substrates with different wettabilities." Physics of Fluids 35, no. 2 (February 2023): 022108. http://dx.doi.org/10.1063/5.0137505.

Full text
Abstract:
The dynamic behavior of compound droplets, which are made up of a millimeter-sized particle and distilled water, impacting substrates of different wettabilities is investigated via high-speed photography. The effects of the size of the particle within the compound droplet, substrate contact angle, and impact height on the deformation of the droplets and the characteristics of the impact are analyzed. It is found that the collisions of compound droplets with substrates can be classified into four categories based on the observed experimental phenomena that occur during the impact. These categories are referred to as adhesion collision, rebound collision, daughter-droplet collision (or partial rebound collision), and breakup collision. We consider both the impact of water droplets and compound droplets (with one of two different-sized particles) on substrates of different wettabilities. The effects of inertia, surface tension, and adhesion between the substrate and the liquid droplet, and adhesion between the particle and the liquid droplet are considered to explain the different collision phenomena of compound droplets and reveal the evolution mechanism of the droplet morphologies in the experiments. Furthermore, the effects of the height from which the droplet is released and the contact angle of the substrate (i.e., its wettability) on the maximum spreading diameter and maximum jet height of the droplet are presented quantitatively. The effect of the size of the particle within the compound droplet and the substrate contact angle on the dynamic behavior of the compound droplet subject to impact with the substrate is also described.
APA, Harvard, Vancouver, ISO, and other styles
5

Wang, Yiting, Lijuan Qian, Zhongli Chen, and Fang Zhou. "Coalescence of Binary Droplets in the Transformer Oil Based on Small Amounts of Polymer: Effects of Initial Droplet Diameter and Collision Parameter." Polymers 12, no. 9 (September 9, 2020): 2054. http://dx.doi.org/10.3390/polym12092054.

Full text
Abstract:
In engineering applications, the coalescence of droplets in the oil phase dominates the efficiency of water-oil separation. To improve the efficiency of water-oil separation, many studies have been devoted to exploring the process of water droplets colliding in the oil phase. In this paper, the volume of fluid (VOF) method is employed to simulate the coalescence of water droplets in the transformer oil based on small amounts of polymer. The influences of the initial diameter and collision parameter of two equal droplets on droplet deformation and coalescence time are investigated. The time evolution curves of the dimensionless maximum deformation diameter of the droplets indicate that the larger the droplet diameter, the more obvious the deformation from central collisions. As the collision parameter increases, the contact area of the two droplets, as well as the kinetic energy that is converted into surface energy, decreases, resulting in an increase in droplet deformation. Furthermore, the effects of the initial droplet diameter and collision parameter on coalescence time are also investigated and discussed. The results reveal that as the initial droplet diameter and collision parameter increase, the droplet coalescence time increases.
APA, Harvard, Vancouver, ISO, and other styles
6

Pinsky, M., A. Khain, and H. Krugliak. "Collisions of Cloud Droplets in a Turbulent Flow. Part V: Application of Detailed Tables of Turbulent Collision Rate Enhancement to Simulation of Droplet Spectra Evolution." Journal of the Atmospheric Sciences 65, no. 2 (February 1, 2008): 357–74. http://dx.doi.org/10.1175/2007jas2358.1.

Full text
Abstract:
Abstract The present study is a continuation of the series of studies dedicated to the investigation of cloud droplet collisions in turbulent flow with characteristics that are typical of real clouds. Detailed tables of collision kernels and collision efficiencies calculated in the presence of hydrodynamic interaction of droplets are presented. These tables were calculated for a wide range of turbulent parameters. To illustrate the sensitivity of droplet size distribution (DSD) evolution to the turbulence-induced increase in the collision rate, simulations of DSD evolution are preformed by solving the stochastic kinetic equation for collisions. The results can be applied to cloud modeling. The tables of collision efficiencies and collision kernels are available upon request. Some unsolved problems related to collisions of droplets and ice hydrometeors in turbulent clouds are discussed in the conclusion.
APA, Harvard, Vancouver, ISO, and other styles
7

Chen, Sisi, M. K. Yau, and Peter Bartello. "Turbulence Effects of Collision Efficiency and Broadening of Droplet Size Distribution in Cumulus Clouds." Journal of the Atmospheric Sciences 75, no. 1 (January 2018): 203–17. http://dx.doi.org/10.1175/jas-d-17-0123.1.

Full text
Abstract:
This paper aims to investigate and quantify the turbulence effect on droplet collision efficiency and explore the broadening mechanism of the droplet size distribution (DSD) in cumulus clouds. The sophisticated model employed in this study individually traces droplet motions affected by gravity, droplet disturbance flows, and turbulence in a Lagrangian frame. Direct numerical simulation (DNS) techniques are implemented to resolve the small-scale turbulence. Collision statistics for cloud droplets of radii between 5 and 25 μm at five different turbulence dissipation rates (20–500 cm2 s−3) are computed and compared with pure-gravity cases. The results show that the turbulence enhancement of collision efficiency highly depends on the r ratio (defined as the radius ratio of collected and collector droplets r/ R) but is less sensitive to the size of the collector droplet investigated in this study. Particularly, the enhancement is strongest among comparable-sized collisions, indicating that turbulence can significantly broaden the narrow DSD resulting from condensational growth. Finally, DNS experiments of droplet growth by collision–coalescence in turbulence are performed for the first time in the literature to further illustrate this hypothesis and to monitor the appearance of drizzle in the early rain-formation stage. By comparing the resulting DSDs at different turbulence intensities, it is found that broadening is most pronounced when turbulence is strongest and similar-sized collisions account for 21%–24% of total collisions in turbulent cases compared with only 9% in the gravitational case.
APA, Harvard, Vancouver, ISO, and other styles
8

Saroka, Mary D., and Nasser Ashgriz. "Separation Criteria for Off-Axis Binary Drop Collisions." Journal of Fluids 2015 (May 25, 2015): 1–15. http://dx.doi.org/10.1155/2015/405696.

Full text
Abstract:
Off-axis collisions of two equal size droplets are investigated numerically. Various governing processes in such collisions are discussed. Several commonly used theoretical models that predict the onset of separation after collision are evaluated based on the processes observed numerically. A separation criterion based on droplet deformation is found. The numerical results are used to assess the validity of some commonly used phenomenological models for drop separation after collision. Also, a critical Weber number for the droplet separation after grazing collision is reported. The effect of Reynolds number is investigated and regions of permanent coalescence and separation are plotted in a Weber-Reynolds number plane for high impact parameter collisions.
APA, Harvard, Vancouver, ISO, and other styles
9

Wang, C. H., K. L. Pan, S. Y. Fu, W. C. Huang, and J. Y. Yang. "An Experimental Investigation on the Coalescent Behaviors of Colliding Droplets." Journal of Mechanics 23, no. 4 (December 2007): 415–22. http://dx.doi.org/10.1017/s1727719100001465.

Full text
Abstract:
AbstractThe coalescent behaviors in collisions between two droplets respectively made of different alkanes, water and alkane, methanol and alkane, and ethanol and hexadecane were experimentally studied. The coalescent results between two droplets of different alkanes are qualitatively the same as that with the same material, which simply form a spherical droplet. However, it took time to have the concentration within the droplet to become uniformly distributed. The collision results of water and alkane droplets collision become slightly more complex, in most cases, the water droplet was either inserted into or adhesive to the hexadecane droplet while only insertion was observed if the target droplet was dodecane or heptane. The inserted water droplet tends to partially expose to the environment as the volume fraction of water is sufficiently high, say, ∼0.62 for hexadecane, > 0.70 for dodecane, and > 0.78 for heptane; and the limit is lowered with the decreasing of water or merged droplet size. For the cases of methanol and alkanes, and ethanol and hexadecane, the two colliding droplets were adhesive to each other in all the studies. Furthermore, in most conditions, air bubbles were observed immediately after the collisions, while only few or even none of them might be trapped within the final merged droplet.
APA, Harvard, Vancouver, ISO, and other styles
10

Demidovich, A. V., S. S. Kralinova, P. P. Tkachenko, N. E. Shlegel, and R. S. Volkov. "Interaction of Liquid Droplets in Gas and Vapor Flows." Energies 12, no. 22 (November 8, 2019): 4256. http://dx.doi.org/10.3390/en12224256.

Full text
Abstract:
We investigated the conditions, characteristics, and outcomes of liquid droplet interaction in the gas medium using video frame processing. The frequency of different droplet collision outcomes and their characteristics were determined. Four interaction regimes were identified: bounce, separation, coalescence, and disruption. Collision regime maps were drawn up using the Weber, Reynolds, Ohnesorge, Laplace, and capillary numbers, as well as dimensionless linear and angular parameters of interaction. Significant differences were established between interaction maps under ideal conditions (two droplets colliding without a possible impact of the neighboring ones) and collision of droplets as aerosol elements. It was shown that the Weber number could not be the only criterion for changing the collision mode, and sizes and concentration of droplets in aerosols influence collision modes. It was established that collisions of droplets in a gaseous medium could lead to an increase in the liquid surface area by 1.5–5 times. Such a large-scale change in the surface area of the liquid significantly intensifies heat transfer and phase transformations in energy systems.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Droplet Collision"

1

Blancher, Roman Adrien. "Numerical simulations of high speed droplet collision." Thesis, Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/19127.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Fujimoto, Hitoshi. "Flow fields of air-liquid droplet two-phase mixture and collision dynamics of a droplet on a surface." Kyoto University, 1995. http://hdl.handle.net/2433/160775.

Full text
Abstract:
本文データは平成22年度国立国会図書館の学位論文(博士)のデジタル化実施により作成された画像ファイルを基にpdf変換したものである
Kyoto University (京都大学)
0048
新制・論文博士
博士(工学)
乙第8868号
論工博第2977号
新制||工||996(附属図書館)
UT51-95-D461
(主査)教授 八田 夏夫, 教授 鈴木 健二郎, 教授 赤松 映明
学位規則第4条第2項該当
APA, Harvard, Vancouver, ISO, and other styles
3

Liu, Muyuan [Verfasser], Dieter [Akademischer Betreuer] Bothe, and Cameron [Akademischer Betreuer] Tropea. "Numerical Study of Head-on Binary Droplet Collisions: Towards Predicting the Collision Outcomes / Muyuan Liu ; Dieter Bothe, Cameron Tropea." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2017. http://d-nb.info/1148650261/34.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Enuguri, Venkata Kotaiah Shiva Teja, and Sri Harsha Karra. "Colliding Drops in Spray Dryers." Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-17386.

Full text
Abstract:
Spray drying is a process, which produces powders from the fluid state. This type of process is mostly used in the industrial sector. In this process, a liquid slurry is atomized, forming droplets, which are dried with hot air. During spray drying these droplets will interact and upon impact can show different types of interactions; droplet-droplet collisions as well as interactions with partially or completely dried particles, leading to agglomeration. The result of collision gives properties of the dried powder. The focus of the thesis is to investigate the droplet-droplet collision outcomes of WPC 80 (Whey Protein Concentrate 80) and Lactose. Then the effects of the absolute droplet diameter and the droplet diameter ratios are to be determined. Existing experimental setup and Image Processing Tool of MATLAB is used to study the collision outcome. The outcomes are shown in a regime map. The present results are compared with different products result and literature study. It is observed that there is an effect on collision outcome for different droplet size ratios and no effect for absolute droplet diameter.
APA, Harvard, Vancouver, ISO, and other styles
5

Ge, Yang. "3D numerical study on droplet-solid collisions in the Leidenfrost regime." Connect to resource, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1124291953.

Full text
Abstract:
Thesis (Ph. D.)--Ohio State University, 2005.
Title from first page of PDF file. Document formatted into pages; contains xxi, 225 p.; also includes graphics (some col.). Includes bibliographical references (p. 218-225). Available online via OhioLINK's ETD Center
APA, Harvard, Vancouver, ISO, and other styles
6

Wunsch, Dirk. "Theoretical and numerical study of collision and coalescence - Statistical modeling approaches in gas-droplet turbulent flows." Thesis, Toulouse, INPT, 2009. http://www.theses.fr/2009INPT031H/document.

Full text
Abstract:
Ce travail consiste en une étude des phénomènes de coalescence dans un nuage de gouttes, par la simulation numérique directe d'un écoulement turbulent gazeux, couplée avec une approche de suivi Lagrangien pour la phase dispersée. La première étape consiste à développer et valider une méthode de détection des collisions pour une phase polydispersée. Elle est ensuite implémentée dans un code couplé de simulation directe et de suivi Lagrangien existant. Des simulations sont menées pour une turbulence homogène isotrope de la phase continue et pour des phases dispersées en équilibre avec le fluide. L'influence de l'inertie des gouttes et de la turbulence sur le taux de coalescence des gouttes est discutée dans un régime de coalescence permanente. Un aperçu est donné de la prise en compte d'autres régimes de collision et de coalescence entre gouttes. Ces simulations sont la base de développement et de validation des approches utilisées dans les calculs à l'échelle industrielle. En particulier, les résultats des simulations sont comparés avec les prédictions d'une approche Lagrangienne de type Monte-Carlo et de l'approche Eulerienne 'Direct Quadrature Method of Moments' (DQMOM). Différents types de fermeture des termes de coalescence sont validés. Les uns sont basés sur l'hypothèse de chaos-moléculaire, les autres sont capables de prendre en compte des corrélations de vitesses des gouttes avant la collision. Il est montré que cette derniere approche prédit beaucoup mieux le taux de coalescence par comparaison avec les résultats des simulations déterministes
Coalescence in a droplet cloud is studied in this work by means of direct numerical simulation of the turbulent gas flow, which is coupled with a Lagrangian tracking of the disperse phase. In a first step, a collision detection algorithm is developed and validated, which can account for a polydisperse phase. This algorithm is then implemented into an existing code for direct numerical simulations coupled with a Lagrangian tracking scheme. Second, simulations are performed for the configuration of homogeneous isotropic turbulence of the fluid phase and a disperse phase in local equilibrium with the fluid. The influence of both droplet inertia and turbulence intensity on the coalescence rate of droplets is discussed in a pure permanent coalescence regime. First results are given, if other droplet collision outcomes than permanent coalescence (i.e. stretching and reflexive separation) are considered. These results show a strong dependence on the droplet inertia via the relative velocity of the colliding droplets at the moment of collision. The performed simulations serve also as reference data base for the development and validation of statistical modeling approaches, which can be used for simulations of industrial problems. In particular, the simulation results are compared to predictions from a Lagrangian Monte-Carlo type approach and the Eulerian 'Direct Quadrature Method of Moments' (DQMOM) approach. Different closures are validated for the coalescence terms in these approaches, which are based either on the assumption of molecular-chaos, or based on a formulation, which allows to account for the correlation of droplet velocities before collision by the fluid turbulence. It is shown that the latter predicts much better the coalescence rates in comparison with results obtained by the performed deterministic simulations
APA, Harvard, Vancouver, ISO, and other styles
7

Aziz, Shiraz Dean. "Impact velocity and surface temperature effects on the collision of a molten tin droplet on a solid surface." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0005/MQ40963.pdf.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Ayala, Orlando. "Effects of turbulence on the collision rate of cloud droplets." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file 6.00 Mb , 236 p, 2005. http://wwwlib.umi.com/dissertations/fullcit/3181864.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Schröder, Simon [Verfasser]. "Stochastic Methods for Fiber-Droplet Collisions in Flow Processes / Simon Schröder." München : Verlag Dr. Hut, 2013. http://d-nb.info/1045988073/34.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Planchette, Carole. "Collisions de gouttes asymétriques." Phd thesis, Université Paris-Est, 2011. http://tel.archives-ouvertes.fr/tel-00647892.

Full text
Abstract:
Dans cette thèse expérimentale, on s'intéresse aux collisions de gouttes mettant en jeu des interfaces asymétriques, soit deux gouttes constituées de liquide différent ou des gouttes de taille différente et recouvertes (ou non) d'une couche de particules hydrophobes. Dans une première partie, on étudie les collisions de gouttes de liquide immiscible. L'asymétrie de tels systèmes repose alors sur le contraste des propriétés des deux liquides : la tension de surface, la viscosité et la densité. Le résultat de ces collisions est une encapsulation totale d'un liquide par un autre ou une encapsulation suivie d'une fragmentation. On s'attache à décrire les régimes observés et à établir des lois permettant de prédire les limites de fragmentation de l'objet obtenu. La seconde partie est consacrée aux interfaces couvertes de particules hydrophobes. Pour ces systèmes, l'asymétrie réside à la fois dans la présence des particules sur une interface et pas sur l'autre et dans le contraste de taille entre les objets étudiés. Ainsi, on considère l'impact entre une petite goutte (recouverte ou non de particules) et une très grosse goutte (recouverte ou non de particules). On caractérise tout d'abord les propriétés mécaniques de ces interfaces via la propagation d'ondes de surface, notamment en terme de tension de surface effective et de module de courbure. Puis, on sonde, dans différentes situations d'impact, la robustesse de ces objets afin d'évaluer la capacité de ces couches particulaires à prévenir la coalescence
APA, Harvard, Vancouver, ISO, and other styles
More sources

Books on the topic "Droplet Collision"

1

Aziz, Shiraz Dean. Impact velocity and surface temperature effects on the collision of a molten tin droplet on a solid surface. Ottawa: National Library of Canada, 1998.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

Sikdar, Sudipta. A quasimolecular simulation of liquid droplet collision and thin film dynamics. 1994.

Find full text
APA, Harvard, Vancouver, ISO, and other styles

Book chapters on the topic "Droplet Collision"

1

Brenn, G. "Droplet Collision." In Handbook of Atomization and Sprays, 157–81. Boston, MA: Springer US, 2010. http://dx.doi.org/10.1007/978-1-4419-7264-4_7.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Potyka, Johanna, Johannes Kromer, Muyuan Liu, Kathrin Schulte, and Dieter Bothe. "Modelling and Numerical Simulation of Binary Droplet Collisions Under Extreme Conditions." In Fluid Mechanics and Its Applications, 127–47. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-09008-0_7.

Full text
Abstract:
AbstractThe complexity of binary droplet collisions strongly increases in case of immiscible liquids with the occurrence of triple lines or for high energetic collisions, where strong rim instabilities lead to the spattering of satellite droplets. To cope with such cases, the Volume of Fluid method is extended by an efficient interface reconstruction, also applicable to multi-material cells of arbitrary configuration, as well as an enhanced continuous surface stress model for accurate surface force computations, also applicable to thin films. For collisions of fully wetting liquids, excellent agreement to experimental data is achieved in different collision regimes. High-resolution simulations predict droplet collisions in the spattering regime and provide detailed insights into the evolution of the rim instability. Another challenge is the numerical prediction of the collision outcome in the bouncing or coalescence region, where the rarefied gas dynamics in the thin gas film determines the collision result. To this end, an important step forward became possible by modelling the pressure in the gas film. With the introduction of an interior collision plane within the flow domain, it is now possible to simulate droplet collisions with gas film thickness reaching the physically relevant length scale.
APA, Harvard, Vancouver, ISO, and other styles
3

Naveen, P. T., Ashish Khare, and A. R. Harikrishnan. "Droplet Collision and Nucleation Hydrodynamics on Superhydrophobic Cylindrical Surfaces." In Lecture Notes in Mechanical Engineering, 411–16. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-6270-7_69.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Fedorchenko, Alexander. "Asymptotic Theory of Droplet Spreading After Collision With a Solid Surface." In Drop-Surface Interactions, 287–90. Vienna: Springer Vienna, 2002. http://dx.doi.org/10.1007/978-3-7091-2594-6_11.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Tajiri, Shinsuke, Michihisa Tsutahara, and Hisao Tanaka. "Simulation of Sound Emitted from Collision of Droplet with Shallow Water by the Lattice Boltzmann Method." In Computational Science – ICCS 2008, 271–80. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-69387-1_30.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

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.

Full text
Abstract:
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.
APA, Harvard, Vancouver, ISO, and other styles
7

Rosa, Bogdan, Hossein Parishani, Orlando Ayala, Lian-Ping Wang, and Wojciech W. Grabowski. "High-Resolution Simulation of Turbulent Collision of Cloud Droplets." In Parallel Processing and Applied Mathematics, 401–10. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-31500-8_41.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Monaco, Ernesto, Kai H. Luo, and Gunther Brenner. "Multiple Relaxation Time Lattice Boltzmann simulation of binary droplet collisions." In Lecture Notes in Computational Science and Engineering, 257–64. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-14438-7_27.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Chaitanya Reddy, C., Sarwasva Chowdhary, and S. Rajesh Reddy. "Impact of Droplet Collisions on Hollow Cone Spray in Crossflow." In Lecture Notes in Mechanical Engineering, 271–76. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-7055-9_46.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

MV, Rohith, Hossein Parishani, Orlando Ayala, Lian-Ping Wang, and Chandra Kambhamettu. "CollisionExplorer: A Tool for Visualizing Droplet Collisions in a Turbulent Flow." In Advances in Visual Computing, 669–80. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-24031-7_67.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Droplet Collision"

1

Pasternak, Lars, and Martin Sommerfeld. "Experimental investigation of size effects in colliding droplet." In ILASS2017 - 28th European Conference on Liquid Atomization and Spray Systems. Valencia: Universitat Politècnica València, 2017. http://dx.doi.org/10.4995/ilass2017.2017.4781.

Full text
Abstract:
The present work focuses on the size effect of binary collisions of PVP droplets (viscosity 5.5 mPas). The aim was the identification of the boundaries between bouncing, coalescence, stretching and reflexive separation.These boundaries are necessary for numerical simulations of droplet collisions in spray drying processes. Therefore, droplet chains were generated by droplet generators with oscillating membrane and directed towards each other at different angles for producing binary collisions. In the experiments two droplet properties (i.e. droplet size and size ratio) were varied. Two synchronised high-speed cameras were used to observe the collision process and outcome perpendicularly and parallelly to the collision plane. The variation of the impact parameter B was performed by a frequency offset for one droplet generator. The relative velocity (i. e. 0.5 to 4.7 m/s) was set by changing the collision angle.DOI: http://dx.doi.org/10.4995/ILASS2017.2017.4781
APA, Harvard, Vancouver, ISO, and other styles
2

Sommerfeld, Martin, and Santiago Lain. "Numerical analysis of sprays with an advanced collision model." In ILASS2017 - 28th European Conference on Liquid Atomization and Spray Systems. Valencia: Universitat Politècnica València, 2017. http://dx.doi.org/10.4995/ilass2017.2017.4785.

Full text
Abstract:
Modelling of collisions between liquid droplets in the frame of a Lagrangian spray simulation has still many openissues, especially when considering higher viscous droplets and if colliding droplets have a large size difference. A generalisation of the collision maps is attempted based on the behaviour of characteristic points, namely the triple point where bouncing, coalescence and stretching separation coincide and the critical Weber-number where reflexive separation first occurs in head-on collisions. This is done by correlating experimental data with respect to the Capillary number with the Ohnesorge-number for the triple point and the critical Weber-number is also well described by a correlation the Ohnesorge-number. Based on these results the boundary line between stretching separation and coalescence is found by adapting the Jiang et al. (1992) correlation. For the upper boundary of reflexive separation the shifted Ashgriz and Poo (1990) correlation is used. It was however so far not possible to predict the lower bouncing boundary through the Estrade et al. (1999) boundary line correctly. The proposed boundary-line models were validated for various liquid, however still considering only a size ratio of one. With the developed three-line boundary model Euler/Lagrange numerical calculations for a simple spray system were conducted and the droplet collisions were analysed with respect to their occurrence. Droplet collision modelling is performed on the basis of the stochastic droplet collision model, also considering the influence of impact efficiency, which so far was neglected for most spray simulations. The comparison with measurements showedreasonable good agreement for all properties.DOI: http://dx.doi.org/10.4995/ILASS2017.2017.4785
APA, Harvard, Vancouver, ISO, and other styles
3

Pan, Kuo-Long, and Chung K. Law. "Dynamics of Droplet-Film Collision." In 43rd AIAA Aerospace Sciences Meeting and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2005. http://dx.doi.org/10.2514/6.2005-352.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Shardt, Orest, J. J. Derksen, and Sushanta K. Mitra. "Simulations of Droplet Collisions in Shear Flow." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-87106.

Full text
Abstract:
When droplets collide in a shear flow, they may coalesce or remain separate after the collision. At low Reynolds numbers, droplets coalesce when the capillary number does not exceed a critical value. We present three-dimensional simulations of droplet coalescence in a simple shear flow. We use a free-energy lattice Boltzmann method (LBM) and study the collision outcome as a function of the Reynolds and capillary numbers. We study the Reynolds number range from 0.2 to 1.4 and capillary numbers between 0.1 and 0.5. We determine the critical capillary number for the simulations (0.19) and find that it is does not depend on the Reynolds number. The simulations are compared with experiments on collisions between confined droplets in shear flow. The critical capillary number in the simulations is about a factor of 25 higher than the experimental value.
APA, Harvard, Vancouver, ISO, and other styles
5

Zhang, Huang, and HanLiang Bo. "Study of Droplets Behaviors in the Steam-Water Separator With Monte Carlo Method." In 2012 20th International Conference on Nuclear Engineering and the ASME 2012 Power Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/icone20-power2012-54959.

Full text
Abstract:
The Monte Carlo method is used to study the behaviors of droplets in the steam-water separator(SWS). Different from previous researches, this paper presents the significance of droplets collision in the SWS. Our major objectives focus on the outcomes of binary-droplet collision. Three regimes of binary-droplet collision including coalescence, reflexive separation and stretching separation are considered. Then we prove that the relative velocity and initial positions of the binary-droplet determine the outcomes of collision at the same ambient atmosphere and properties of droplets(e.g. viscosity and coefficient of surface tension). The probability distribution of the collision outcomes of the binary-droplet associated with average radius in the condition of both cold and actual operating state in the SWS is performed by the Monte Carlo method.
APA, Harvard, Vancouver, ISO, and other styles
6

Ouyang, Shuo, Zhenqin Xiong, Jiyun Zhao, Ruiqi Kang, and Zhen Li. "Experimental Study of Droplets Collision and Bag Breaking in Rotating Gas Flow Field." In 2022 29th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/icone29-92947.

Full text
Abstract:
Abstract In swirl-vane separators, the liquid phase is separated from the rotating gas flow under the action of centrifugal force. The droplets are carried by the rotating gas flow to the wall of the separator. In this paper, the phenomenon of a single droplet hitting on a stationary droplet on the wall in the rotating flow field is recorded by using a high-speed camera. Different types of droplet collisions appear as the inlet airflow velocity increases from 4 m/s to 4.8 m/s. Results show that the binary droplet impacts in the rotating flow field occur in asymmetric outcomes such as coalescence, finger spreading, finger breaking and splashing with the increase of the Weber number. The spiral characteristic of the rotating flow field leads to the asymmetry of the droplet collision. The bag breaking occurs in the rotating flow field. The number of droplets of bag breaking and breaking time are increased with Weber number increasing. This study provides basic characteristics for the impact of binary droplets in the rotating flow field and bag breaking, as well as improves the understanding of the separation efficiency mechanism of the gas-liquid separator.
APA, Harvard, Vancouver, ISO, and other styles
7

Zhang, Huang, and HanLiang Bo. "Numerical Prediction of the Outcomes of Binary-Droplet Collision in Steam-Water Separator." In 2013 21st International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/icone21-15296.

Full text
Abstract:
A theoretical model is carried out to describe the regimes of binary-droplet collision in steam-water separator (SWS). Different from previous researches which seldom concerned the interaction between droplets moving in the SWS, this study indicates that droplet collision, especially the binary-droplet collision, is a key factor to influence the efficiency of SWS. Four regimes of binary-droplet collision including bounce, coalescence, reflexive separation and stretching separation are considered. A brief summary is showed how this theoretical model is established according to previous papers. Then we use this model to study the probability of the four regimes and the states of droplets (e. g., number, size and velocity) after binary-droplet collision. The results perform that, at low symmetric Webber number (Wes), coalescence is the dominate regime. While, with the increasing Wes, the probability of stretch separation goes up quickly. Otherwise, coalescence would not occur frequently at this time. The probability of reflexive separation always stays at a low level. In addition, bounce would not happen whatever the Wes is. From the calculation results of post-collision drops, binary-droplet combine as one drop in coalescence. In reflexive or stretch separation, the large drop and the small one would remain their velocities but their radii might decrease, for satellite droplets may be generated.
APA, Harvard, Vancouver, ISO, and other styles
8

Fujimoto, Hitoshi, Natsuo Hatta, and Hirohiko Takuda. "Collision Dynamics of Two Droplets." In ASME 1997 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/imece1997-0770.

Full text
Abstract:
Abstract This paper treats the numerical analysis of the deformation behavior of liquid after head-on collision of two droplets. The simulation of the liquid deformation process has been performed using the MAC-type solution method to solve a finite differencing approximation of the Navier-Stokes equations governing an axisymmetric incompressible fluid flow. When a water droplet collides head-on into another one with small initial Weber numbers, two droplets coalesce and remain permanently united. For larger Weber numbers, two droplets merge temporarily and subsequently separate into two or more drops. The calculated free surface configurations have been in qualitative agreement with the experimental results observed by other researchers. Also, the critical Weber number to predict coalescence/separation of liquid after head-on collision has agreed with the experimental data. The details of droplet deformation mechanism have been discussed from a qualitative as well as quantitative point of view.
APA, Harvard, Vancouver, ISO, and other styles
9

Shan, Y., T. W. Coyle, and J. Mostaghimi. "Influence of Droplet Breakup and Collision in the Solution Precursor Plasma Spraying Process." In ITSC2007, edited by B. R. Marple, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima, and G. Montavon. ASM International, 2007. http://dx.doi.org/10.31399/asm.cp.itsc2007p0260.

Full text
Abstract:
Abstract Finely structured ceramic coatings can be obtained by solution precursor plasma spraying. The final structure of the coating highly depends on the droplet size and velocity distribution at the injection, the evolution of the spray in the jet, and droplet breakup and collision within the spray. This paper describes a 3D model to simulate the transport phenomena and the trajectory and heating of the solution spray in the process. O’Rourke’s droplet collision model is used to take into account of the influence of droplet collision. The influence of droplet breakup is also considered by implementing TAB and Wave droplet breakup models into the plasma jet model. The effects of droplet collisions and breakup on the droplet size, velocity, and temperature distribution of the solution spray are investigated. The results indicate that droplet breakup and collision play an important role in determining the final particle size and velocity distributions on the substrate.
APA, Harvard, Vancouver, ISO, and other styles
10

Chen, Xiaodong, Dongjun Ma, and Vigor Yang. "Collision Outcome and Mass Transfer of Unequal-sized Droplet Collision." In 50th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2012. http://dx.doi.org/10.2514/6.2012-1090.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Droplet Collision"

1

Law, Chung K. Droplet Collision in Liquid Propellant Combustion. Fort Belvoir, VA: Defense Technical Information Center, August 1997. http://dx.doi.org/10.21236/ada329722.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Law, Chung K. Droplet Collision in Liquid Propellant Combustion. Fort Belvoir, VA: Defense Technical Information Center, September 2000. http://dx.doi.org/10.21236/ada383455.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Law, Chung K. Dynamics of Droplet Collision and Flamefront Motion. Fort Belvoir, VA: Defense Technical Information Center, December 2005. http://dx.doi.org/10.21236/ada457757.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Law, Chung K. Dynamics of Droplet Collision and Flame Motion. Fort Belvoir, VA: Defense Technical Information Center, March 2004. http://dx.doi.org/10.21236/ada421044.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Law, Chung K. High-Speed Imaging System for Droplet Collision and Unsteady Combustion Studies. Fort Belvoir, VA: Defense Technical Information Center, March 2004. http://dx.doi.org/10.21236/ada421064.

Full text
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Droplet Collision' for particular source types:
Journal articles Dissertations / Theses
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography