Relevant bibliographies by topics / Evaporation Flash de Spray

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

Academic literature on the topic 'Evaporation Flash de Spray'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Evaporation Flash de Spray"

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Ding, Hong Yuan, Peng Deng, Xu Yao Mao, and Chao Wu. "Flash Boiling Spray Simulation Based on Void Fraction and Superheat Controlling." Applied Mechanics and Materials 737 (March 2015): 289–95. http://dx.doi.org/10.4028/www.scientific.net/amm.737.289.

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A new flash boiling spray model whose atomization criterion based on the void fraction and superheat while evaporation model based on the dual-zone method is established to simulate the flashing sprays. The model function is implemented in KIVA program. Flash boiling spray model predicts spray penetration and spray cone angle and its development trend, in good agreement with the experimental results. The model has a good capability in simulating flash sprays at low superheat conditions, which breakup is controlled by void fraction, as well as high superheat transition process. It can also predict flare flashing sprays to some extent at higher superheat conditions.
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Okazaki, Takahiro, Zensaku Kawara, Takehiko Yokomine, and Tomoaki Kunugi. "Enhancement of MSF Using Microbubbles." International Journal of Chemical Reactor Engineering 13, no. 4 (December 1, 2015): 469–75. http://dx.doi.org/10.1515/ijcre-2014-0169.

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Abstract Multi Stage Flash (MSF) distillation plants are widely used in saline water desalination. In order to enhance MSF, it is important to increase an evaporation rate in the flashing stage. A spray flash method, in which superheated water jets are injected through nozzles into a depressurized environment to increase the gas/liquid interface area, is a promising technique to make the increase of evaporation rate, which leads directly to the reduction of energy consumption and cost of the MSF plant. In this paper, the introduction of microbubbles into the spray jet as the nucleation sites to increase the evaporation rate of the spray flash is proposed. The spray flash behaviours with/without microbubbles at outside/inside of the nozzle-inside were observed by means of a high speed camera to investigate the mechanism of enhancement of spray flash due to microbubbles. Moreover, the number densities of droplets and bubble volume increase were obtained from visualized images in order to discuss quantitatively on the effects of introduction of microbubbles.
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Sève, Aymeric, Vincent Pichot, Fabien Schnell, and Denis Spitzer. "Trinitrotoluene Nanostructuring by Spray Flash Evaporation Process." Propellants, Explosives, Pyrotechnics 42, no. 9 (June 7, 2017): 1051–56. http://dx.doi.org/10.1002/prep.201700024.

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Ma, Wei, Siping Zhai, Ping Zhang, Yaoqi Xian, Lina Zhang, Rui Shi, Jiang Sheng, Bo Liu, and Zonglin Wu. "Research Progresses of Flash Evaporation in Aerospace Applications." International Journal of Aerospace Engineering 2018 (December 17, 2018): 1–15. http://dx.doi.org/10.1155/2018/3686802.

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Liquid is overheated and evaporated quickly when it enters into the environment with lower saturation pressure than that corresponding to its initial temperature. This phenomenon is known as the flash evaporation. A natural low-pressure environment and flash evaporation have unique characteristics and superiority in high altitude and outer space. Therefore, flash evaporation is widely used in aerospace. In this paper, spray flash evaporation and jet flash evaporation which are two different forms were introduced. Later, key attentions were paid to applications of flash evaporation in aerospace. For example, the flash evaporation has been used in the thermal control system of an aircraft and the propelling system of a microsatellite and oil supply system of a rocket motor. Finally, the latest progresses in the calculation model and numerical simulation of flash evaporation were elaborated.
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Miyatake, Osamu, and Yasuhiro Miki. "Simplified expression for efficiency of spray flash evaporation." KAGAKU KOGAKU RONBUNSHU 13, no. 2 (1987): 252–56. http://dx.doi.org/10.1252/kakoronbunshu.13.252.

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Ghiaasiaan, S. M. "Thermal-Hydraulics of OC-OTEC Spout Flash Evaporators." Journal of Energy Resources Technology 114, no. 3 (September 1, 1992): 187–96. http://dx.doi.org/10.1115/1.2905940.

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A mechanistic model was developed for the thermal-hydraulic processes in the spout flash evaporator of an OC-OTEC plant. Nonequilibrium, two-fluid, conservation equations were solved for the two-phase flow in the spout, accounting for evaporation at the gas-liquid interface, and using a two-phase flow regime map consisting of bubbly, churn-turbulent and dispersed droplet flow patterns. Solution of the two-phase conservation equations provided the flow conditions at the spout exit, which were used in modeling the fluid mechanics and heat transfer in the evaporator, where the liquid was assumed to shatter into a spray with a log-normal size distribution. Droplet size distribution was approximated by using 30 discrete droplet size groups. Droplet momentum conservation equations were numerically solved to obtain the residence time of various droplet size groups in the evaporator. Evaporative cooling of droplets was modeled by solving the 1-D heat conduction equation in spheres, and accounting for droplet internal circulation by an empirical thermal diffusivity multiplier. The model was shown to favorably predict the available single-spout experimental data.
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Koito, Yasushi, Kazuyoshi Tanaka, and Osamu Miyatake. "An Experimental Study on Enhancement of Spray Flash Evaporation." KAGAKU KOGAKU RONBUNSHU 29, no. 1 (2003): 150–53. http://dx.doi.org/10.1252/kakoronbunshu.29.150.

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Cai, Benan, Xiaobing Tuo, Zichen Song, Yulong Zheng, Hongfang Gu, and Haijun Wang. "Modeling of spray flash evaporation based on droplet analysis." Applied Thermal Engineering 130 (February 2018): 1044–51. http://dx.doi.org/10.1016/j.applthermaleng.2017.11.083.

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Cai, Benan, Yongguang Yin, Yulong Zheng, Wei Wang, Hongfang Gu, Jianan Yao, and Haijun Wang. "Mathematical study of spray flash evaporation in a spray-assisted seawater desalination chamber." Desalination 465 (September 2019): 25–37. http://dx.doi.org/10.1016/j.desal.2019.03.007.

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Berthe, Jean-Edouard, Fabien Schnell, Yannick Boehrer, and Denis Spitzer. "Nanocrystallisation of Ammonium DiNitramide (ADN) by Spray Flash Evaporation (SFE)." Propellants, Explosives, Pyrotechnics 43, no. 6 (May 24, 2018): 609–15. http://dx.doi.org/10.1002/prep.201800039.

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Dissertations / Theses on the topic "Evaporation Flash de Spray"

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Berthe, Jean-Edouard. "Amélioration des explosifs par ajustement de leur balance en oxygène lors de la cristalisation par Evaporation Flash de Spray." Thesis, Strasbourg, 2018. http://www.theses.fr/2018STRAE023/document.

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Dans la littérature, que ce soit pour un explosif secondaire ou un matériau composite, une balance en oxygène (BO) proche de 0% est assimilée à de bonnes performances énergétiques (vitesse de détonation, chaleur de décomposition, etc…). L’objectif majeur de cette thèse est d’améliorer les performances énergétiques d’explosifs secondaires courants (RDX, HMX, CL-20) par l’ajout d’un oxydant (DNA) afin d’obtenir un matériau composite avec une BO de -1%. Le mélange intime de ces deux composés est permis par un procédé d’évaporation flash de spray, utilisé habituellement pour réduire la taille de particules des explosifs. Les matériaux composites ont été cristallisés dans les trois cas avec succès, avec la présence d’explosif submicrométrique et de DNA nanostructuré. Un tel résultat a été permis grâce à une meilleure compréhension du procédé, et en conséquence l’ajustement des conditions expérimentales. L’étude de la réactivité de ces matériaux composites montre dans certains cas une désensibilisation, une diminution de la distance de la déflagration à la détonation, ou encore une augmentation de la vitesse de détonation, comparée aux explosifs correspondants
In literature, for secondary explosive or composite material, an oxygen balance (OB) close to 0% is often linked to good energetic performances (detonation velocity, heat of decomposition, etc.). The main objective of this thesis is to enhance energetic performances of current secondary explosives (RDX, HMX, CL-20) by adding oxidizer (ADN) to obtain a composite material with an OB of -1%. The spray flash evaporation process, usually used for particle size reduction of explosives, enables to obtain an intimate mixture of these two compounds. Composite materials were successfully crystallized in three cases, resulting of submicrometric explosives and nanostructured ADN particles. These results were obtained thanks to a preliminary study for better process understanding and the optimization of experimental conditions. Reactivity studies show some desensitization, shorter distance from deflagration to detonation, and/or higher detonation velocity, compared to corresponding explosives
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Pessina, Florent. "Toward particle size reduction by spray flash evaporation : the case of organic energetic crystals and cocrystals." Thesis, Strasbourg, 2016. http://www.theses.fr/2016STRAE031/document.

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La cristallisation en continu de nanoparticules énergétiques est un défi de longue date. Le Spray Flash Evaporation (SFE) est une technique majeure développée et brevetée en interne, pour la production en continu de matériaux énergétiques submicroniques ou nanométriques ; la technologie se base sur la surchauffe d’un solvant pulvérisé dans le vide et s’évaporant de manière flash. Ce présent travail de recherche a pour but de comprendre et contrôler la cristallisation au sein du procédé SFE. Le RDX et le cocristal CL-20:HMX 2:1 sont étudiés. La sursaturation, concernant le SFE, est une fonction du temps et de l’espace liée aux tailles et vitesses de gouttes : elle fut variée par un anti-solvant et par l’amélioration du SFE avec un système double buse. Ensuite, PVP 40K et PEG 400 ont été utilisés afin de contrôler la nucléation et la croissance. Les particules ont pu être ajustées d’une taille de 160 nm à 5 µm, avec des morphologies facettées ou sphériques et avec des sensibilités moindres
The continuous formation of nanosized energetic material is a long-standing challenge. Spray Flash Evaporation (SFE) is a major technique, internally developed and patented, for continuously producing energetic materials at submicron or nano scale; it relies on the superheating of a solvent sprayed into vacuum and thus flashing. This present research project aims to understand and control the crystallisation occurring in the SFE process. RDX and the cocrystal CL-20:HMX 2:1 was studied overcome the limited in situ characterizations also. The supersaturation is a function of time and space in SFE, linked to the size distribution and velocity of droplets. Supersaturation was raised with an anti-solvent and by the enhancement of the SFE with a dual nozzle system. Then PVP 40K and PEG 400 were successfully used to alter the nucleation and the growth. The particles were subsequently tuned from 160 nm spheres to 5 µm grains and were less sensitive, especially toward electrostatic discharge
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Le, Brize Axel. "Etude de la nanostructuration de matériaux énergétiques multi-composants pour application aux poudres propulsives à sensibilités réduites." Thesis, Strasbourg, 2017. http://www.theses.fr/2017STRAE020/document.

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Les travaux de thèse présentés dans ce manuscrit ont porté sur l’élaboration et la caractérisation de poudres propulsives à sensibilités réduites. Ceci a été effectué par l’utilisation de matériaux énergétiques relativement insensibles ainsi que par l’emploi du procédé de Spray Evaporation Flash (SFE). Ce dernier a permis d’obtenir des poudres nanostructurées de composition ternaire. La caractérisation de ces poudres propulsives par spectroscopie Raman a permis de mettre en évidence le mécanisme de plastification de la nitrocellulose par les plastifiants employés. Des analyses de microscopie électronique à balayage ont été menées pour étudier la granulométrie de ces échantillons. Leur caractérisation par diffraction des rayons X a permis d’étudier leur structure et leur cristallisation. Des mesures de calorimétrie différentielle à balayage, des essais de tirs en tubes et en bombe manométrique, ainsi que des mesures de sensibilités à divers types de sollicitations, ont permis de montrer que les poudres obtenues sont particulièrement insensibles
The PhD thesis presented in this manuscript focused on the elaboration and characterization of propellants with reduced sensitivities. This was accomplished by the use of relatively insensitive energetic materials, in conjunction with the application of the Spray Flash Evaporation (SFE) process. The latter made it possible to obtain nanostructured propellants of ternary composition.The characterization of these propellants by Raman spectroscopy revealed the mechanisms ruling the plasticization of nitrocellulose by the plasticizers used. Scanning electron microscopy analyzes were conducted to determine the particle size of these samples. Their characterization by X-ray diffraction allowed to study their structure and their crystallization. These propellants were shown to be particularly insensitive through analyses by differential scanning calorimetry,pyrotechnic tests in tubes and manometric vessels as well as sensitivity measurements to various types of solicitations
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Beshay, Karam Ramzy. "Computer modelling of diesel spray dispersion and evaporation." Thesis, Imperial College London, 1985. http://hdl.handle.net/10044/1/37636.

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Fujita, Akitoshi. "Numerical Simulations of Spray Combustion and Droplet Evaporation." 京都大学 (Kyoto University), 2011. http://hdl.handle.net/2433/142213.

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Booth, Alexander John. "A novel, biomimetically inspired, flash evaporation liquid atomization system." Thesis, University of Leeds, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.713482.

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The increasing demands placed on conventional methods of liquid atomization, in terms of spray quality, now mean that there is a need for a new, disruptive, liquid atomization technology which can rapidly improve spray performance to meet the growing sophistication required of modern liquid spray systems. This thesis details an investigation into the mode of action of a liquid atomization system (pMISTe) which shows promise to be able to provide this disruptive new spray technology. Influenced by the defence mechanism of the bombardier beetle, this atomization method produces a large amount of volumetric shear in a body of liquid, by inducing a flash evaporation of a proportion of the total liquid mass in an enclosed chamber. The flash evaporation is created firstly by heating the liquid far above its saturation temperature at an ambient external pressure - in a chamber cavity sealed by an electronically controlled ejection valve. This valve is released very rapidly, causing the liquid in the chamber to suddenly `see' the ambient external pressure. It is this sudden exposure of a superheated liquid to the low external ambient pressure that drives the flash evaporation and the atomisation. The atomization system was investigated using a staged experimental method, including a mixture of Taguchi Design of Experiment (DoE) and full factorial techniques. From these investigations the main characteristics of the mode of action of the system were identified. These were that, in general, increases in chamber liquid temperature caused decreasing average droplet size, and that increases in refill flow rate caused increasing droplet size; due to the primary flash evaporation mechanism. In addition more complex secondary behaviours, attributed to the fluid dynamic properties of the system, were discovered. The performance of the system is also discussed with reference to its suitability for a range of spray applications
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Jachuck, Roshan Jeet Jee. "The rapid cooling of polymers using spray evaporation techniques." Thesis, University of Newcastle Upon Tyne, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316249.

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Majhool, Ahmed Abed Al-Kadhem. "Advanced spray and combustion modelling." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/advanced-spray-and-combustion-modelling(eb3ef22a-53d0-4e70-aa9d-bec37775d451).html.

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The thesis presents work across three different subjects of investigations into the modelling of spray development and its interaction with non-reactive and reactive flow. The first part of this research is aimed to create a new and robust family of convective scheme to capture the interface between the dispersed and the carrier phases without the need to build up the interface boundary. The selection of Weighted Average Flux (WAF) scheme is due to this scheme being designed to deal with random flux scheme which is second-order accurate in space and time. The convective flux in each cell face utilizes the WAF scheme blended with Switching Technique for Advection and Capturing of Surfaces (STACS) scheme for high resolution flux limiters. However in the next step, the high resolution scheme is blended with the scheme to provide the sharpness and boundedness of the interface by using switching strategy. The proposed scheme is tested on capturing the spray edges in modelling hollow cone type sprays without need to reconstruct two-phase interface. A test comparison between TVD scheme and WAF scheme using the same flux limiter on convective flow on hollow cone spray is presented. Results show that the WAF scheme gives better prediction than the TVD scheme. The only way to check the accuracy of the presented models are evaluations according to physical droplets behaviour and its interaction with air. In the second part, due to the effect of evaporation the temperature profile in the released fuel vapour has been proposed. The underlying equation utilizes transported vapour mass fraction. It can be used along with the solution of heat transfer inside a sphere. After applying boundary conditions, the equation can provide a solution of existing conditions at liquid-gas interface undergoing evaporation and it is put in a form similar to well-known one-third rule equation. The resulting equation is quadratic type that gives an accurate prediction for the thermo-physical properties due to the non-linear relation between measured properties and temperature. Comparisons are made with one-third rule where both equations are implemented in simulating hollow cone spray under evaporation conditions. The results show the presumed equation performs better than one-third rule in all comparisons. The third part of this research is about a conceptual model for turbulent spray combustion for two combustion regimes that has been proposed and tested for n-heptane solid cone spray type injected into a high-pressure, high-temperature open reactor by comparing to the available experimental data and to results obtained using two well known combustion models named the Combined Combustion Model (CCM) and the unsteady two-dimensional conditional moment closure (CMC) model. A single-zone intermittent beta-two equation turbulent model is suggested to characterise the Lumped zone. This model can handle both unburned and burned zones. Intermittency theory is used to account for the spatially non-uniform distribution of viscous dissipation. The model suggests that the Lumped zone can be identified by using the concept of Tennekes and Kuo-Corrsion of isotropic turbulence that suggests that dissipative eddies are most probably formed as vortex tubes with a diameter of the order of Kolmogorov length scale and a space of the order of Taylor length scale. Due to the complexity of mixture motion in the combustion chamber, there exist coherent turbulent small scale structures containing highly dissipative vortices. The small size eddies play an important role in extinguishing a diffusion spray flame and have an effect on the combustion reaction at molecular scale because small scales turbulence increase heat transfer due to the dissipation. A common hypothesis in constructing part of the model is if the Kolmogorov length scale is larger than the turbulent flame thickness. The Lumped strategy benefits from capturing small reactive scales information provided by numerics to improve the modelling and understand the exact implementation of the underlying chemical hypothesis. The Lumped rate is estimated from the ratio of the turbulent diffusion to reaction flame thickness. Three different initial gas temperature test cases are implemented in simulations. Lumped spray combustion model shows a very good agreement with available experimental data concerning auto-ignition delay points.
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Gupta, Kishor Kumar. "Polyvinyl alcohol size recovery and reuse via vacuum flash evaporation." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/28181.

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Thesis (M. S.)--Polymer, Textile and Fiber Engineering, Georgia Institute of Technology, 2009.
Committee Chair: Dr. Cook, Fred L.; Committee Member: Dr. Carr, Wallace W.; Committee Member: Dr. Parachuru, Radhakrishnaiah; Committee Member: Dr. Realff, Matthew J.; Committee Member: Dr. Muzzy, John D.
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Dutko, Alexander C. "Acoustic enhancement of water spray evaporation within a pulse combustor." Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/17872.

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Books on the topic "Evaporation Flash de Spray"

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Silva, Washington L. C. Modeling spray evaporation and microclimate changes downwind of a low pressure spray sprinkler. 1985.

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Book chapters on the topic "Evaporation Flash de Spray"

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Labille, Jérôme, Natalia Pelinovskaya, Céline Botta, Jean-Yves Bottero, Armand Masion, Dilip S. Joag, Richard G. Forbes, et al. "Flash Evaporation Liquid Atomization." In Encyclopedia of Nanotechnology, 860. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-90-481-9751-4_100251.

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Vardelle, A., M. Vardelle, P. Fauchais, and D. Gobin. "Monitoring Particle Impact on a Substrate during Plasma Spray Process." In Flash Reaction Processes, 95–121. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0309-1_4.

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Howarth, C. R., R. J. J. Jachuck, and C. Ramshaw. "Energy Efficient Processing Using Spray Evaporation Cooling Techniques." In Energy Efficiency in Process Technology, 702–11. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1454-7_63.

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Chrigui, Mouldi, Fernando Sacomano, Amsini Sadiki, and Assaad R. Masri. "Evaporation Modeling for Polydisperse Spray in Turbulent Flow." In Experiments and Numerical Simulations of Turbulent Combustion of Diluted Sprays, 55–77. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04678-5_3.

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Zoby, M. R. G., A. Kronenburg, S. Navarro-Martinez, and A. J. Marquis. "Assessment of Conventional Droplet Evaporation Models for Spray Flames." In High Performance Computing in Science and Engineering '11, 209–27. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-23869-7_17.

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Tsujino, Jiro, Noriyuki Tatsumi, Shigenori Yuhya, Kei Kikuchi, and Yuh Shiohara. "Superconducting YBa2Cu3Ox Films Prepared by rf Plasma Flash Evaporation." In Advances in Superconductivity V, 1013–16. Tokyo: Springer Japan, 1993. http://dx.doi.org/10.1007/978-4-431-68305-6_227.

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Olguin, Hernan, and Eva Gutheil. "Theoretical and Numerical Study of Evaporation Effects in Spray Flamelet Modeling." In Experiments and Numerical Simulations of Turbulent Combustion of Diluted Sprays, 79–106. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04678-5_4.

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Tatsumi, Noriyuki, Jiro Tsujino, and Yuh Shiohara. "Synthesis of YBCO films on (100)YSZ by rf flash plasma evaporation." In Advances in Superconductivity VII, 609–12. Tokyo: Springer Japan, 1995. http://dx.doi.org/10.1007/978-4-431-68535-7_134.

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Sadiki, Amsini, W. Ahmadi, and Mouldi Chrigui. "Toward the Impact of Fuel Evaporation-Combustion Interaction on Spray Combustion in Gas Turbine Combustion Chambers. Part II: Influence of High Combustion Temperature on Spray Droplet Evaporation." In ERCOFTAC Series, 111–32. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-1409-0_4.

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Loureiro, D. D., J. Reutzsch, A. Kronenburg, B. Weigand, and K. Vogiatzaki. "Towards Full Resolution of Spray Breakup in Flash Atomization Conditions Using DNS." In High Performance Computing in Science and Engineering '19, 209–24. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-66792-4_15.

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Conference papers on the topic "Evaporation Flash de Spray"

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Guo, Guangyu, Hongling Deng, Chao Zhu, and Zhiming Ji. "Non-Volatile Fraction Effects in Dispersed Vacuum Spray Flash Evaporation." In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-23506.

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Abstract Spray flash evaporation has been widely used in spray cooling and thermal distillation as a technology of heat/mass transfer enhancement. In a vacuum spray flash process, the vapor is instantly extracted by vacuuming, while the supersaturated droplets are further cooled by the continued spray flash until becoming saturated or discharged. Hence, in the evaporator, non-equilibrium exists not only in the flash evaporation driven by the pressure difference between droplet and ambient but also in the temperatures of yields, namely, generated vapor and discharged liquid with or without precipitates. To deeper understand such interesting thermal non-equilibrium between two phases in a spray flash evaporation of salty water, this paper establishes a multi-component spray flash evaporation model which coupled with diffusivity effect of non-volatile fraction, as well as the influence of spray polydispersion. An experimental system is also set up for evaporative coefficient determination, as well as model validation. The theoretical and experimental results meet a good agreement. It indicates the salinity and the superheat level of inlet feed have substantial impacts on such thermal non-equilibrium phenomenon of the temperature difference between the extracted vapor and the discharged liquid residue.
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Guo, Guangyu, Chao Zhu, and Zhiming Ji. "CFD SIMULATION OF ISOLATED SPRAY FLASH EVAPORATION WITH ACTIVE VAPOR EXTRACTION." In 5th Thermal and Fluids Engineering Conference (TFEC). Connecticut: Begellhouse, 2020. http://dx.doi.org/10.1615/tfec2020.fip.032143.

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Wang, Huihui, Dan Zhang, Shuran Zhao, and Jiping Liu. "Experimental Study on Evaporation properties during Spray Flash of Aqueous NaCl Solution." In The 5th World Congress on Momentum, Heat and Mass Transfer. Avestia Publishing, 2020. http://dx.doi.org/10.11159/enfht20.171.

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Ji, Can, Lin Cheng, Naihua Wang, and Zhigang Liu. "SYSTEM DESIGN AND EXPERIMENTAL INVESTIGATION ON HIGHTEMPERATURE AND HIGH-PRESSURE SPRAY FLASH EVAPORATION." In International Heat Transfer Conference 16. Connecticut: Begellhouse, 2018. http://dx.doi.org/10.1615/ihtc16.mpf.023342.

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Schmehl, Roland, and Johan Steelant. "Flash-Evaporation of Oxidizer Spray During Start-Up of an Upper-Stage Rocket Engine." In 39th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2003. http://dx.doi.org/10.2514/6.2003-5075.

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Nocivelli, Lorenzo, Junhao Yan, Kaushik Saha, Gina M. Magnotti, Chia-Fon Lee, and Sibendu Som. "Effect of Ambient Pressure on the Behavior of Single-Component Fuels in a Gasoline Multi-Hole Injector." In ASME 2019 Internal Combustion Engine Division Fall Technical Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/icef2019-7258.

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Abstract The injection characteristics of neat ethanol and pure iso-octane are studied under different ambient pressure and temperature conditions. Injection under flash-boiling conditions can enhance liquid atomization and evaporation, providing the possibility of improvement in the fuel/air mixing. These super-heated conditions often introduce phenomena that are not taken into account in the standard modeling of sprays for engine applications. The present work proposes a numerical investigation of the behavior of Engine Combustion Network’s 8-hole spray-G injector, starting at the subcooled nominal condition and reducing the ambient pressure at constant low temperature to reach the flare flash-boiling condition. To initialize the properties of the injected fuel, the flow in the nozzle is simulated with a Eulerian approach, handling the two phases with a mixture model and the phase change, due to cavitation and flash boiling, with the Homogenous Relaxation Model. A map of the mixture’s kinematic and thermal behavior is obtained at the interface between the injector and the chamber to initialize the Lagrangian simulations. A literature-based vaporization model is implemented to obtain the proper description of the characteristic features of a multi-hole spray under super-heated conditions, like plume-plume interaction. The numerical representation of the spray is validated in terms of penetration and radial spreading on DBI images, reproducing the light attenuation profiles caused by the presence of the liquid spray. Simulations show that coupled nozzle flow and spray calculations capture the spray morphology and shape better compared to calculations performed without considering the nozzle flow simulation details, especially under flare flash conditions.
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Golliher, Eric L., and Shi-chune Yao. "Exploration of Impinging Water Spray Heat Transfer at System Pressures Near the Triple Point." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-66872.

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The heat transfer of a water spray impinging upon a surface in a very low pressure environment is of interest to cooling of space vehicles during launch and re-entry, and to industrial processes where flash evaporation occurs. At very low pressure, the process occurs near the triple point of water, and there exists a transient multiphase transport problem of ice, water and water vapor. At the impingement location, there are three heat transfer mechanisms: evaporation, freezing and sublimation. A preliminary heat transfer model was developed to explore the interaction of these mechanisms at the surface and within the spray.
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Chen, Hao, Min Xu, Gaoming Zhang, Ming Zhang, and Yuyin Zhang. "Investigation of Ethanol Spray From Different DI Injectors by Using Two-Dimensional Laser Induced Exciplex Fluorescence at Potential Cold-Start Condition." In ASME 2010 Internal Combustion Engine Division Fall Technical Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/icef2010-35090.

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The spray evaporation of gasoline and ethanol fuel was investigated qualitatively through the use of the planar laser induced exciplex fluorescence (PLIEF) technique in a constant volume chamber. The effect of fuel temperature and ambient pressure on spray evaporation was identified over a range of conditions. Both a swirl injector and a multi-hole injector were examined for each of the two fuels. A coevaporative mixture of benzene and triethylamine (TEA) was used as a fluorescent seeding material to study the evaporation processes of ethanol fuel. A mixture of fluorobenzene (FB) and diethylmethylamine (DEMA) in n-hexane, which has been proved to be a suitable seeding material for LIEF measurement, allowed for the investigation of the evaporation processes of gasoline fuel mixture. Remarkable spray evaporation processes were observed for both gasoline and ethanol fuel by increasing fuel temperature or by reducing ambient pressure to a vacuum. Especially after achieving flash-boiling, the vapor distribution of multi-plume spray increases dramatically, and the vapor phase of spray from swirl injector gathers to the centerline of injector by increasing the superheated degree. The collapsing of both liquid and vapor phases of n-hexane is stronger than that of ethanol spray for both swirl and multi-hole injectors.
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Lyras, Konstantinos, Siaka Dembele, C. Madhav Rao Vendra, and Jennifer Wen. "Numerical simulation of superheated jets using an Eulerian method." In ILASS2017 - 28th European Conference on Liquid Atomization and Spray Systems. Valencia: Universitat Politècnica València, 2017. http://dx.doi.org/10.4995/ilass2017.2017.4667.

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Flash boiling is the rapid phase change of a pressurised fluid that emerges in ambient conditions below its vapourpressure. Flashing can occur either inside or outside the nozzle depending on the local pressure and geometry and the bubble formation leads to interfacial interactions that eventually influence the emerging spray. Lagrangian methods which exist in literature to simulate the flash atomisation and inter-phase heat transfer employ many sim- plifying assumptions. Typically, sub-models used for the break-up, collisions and evaporation introduce an extensive empiricism that might result in unrealistic predictions for cases like flashing. In this study, a fully Eulerian approach is selected employing the Σ − Y model proposed by Vallet and Borghi. The model tracks liquid structures of any shape and computes the spray characteristics comprising a modified version for the transport equation of the sur- face density. The main goal of this study is to investigate the performance of this model in flash boiling liquids using the Homogeneous Relaxation Model (HRM) developed by Downar-Zapolski, a model capable of capturing the heat transfer under sudden depressurisation conditions accounting for the non-equilibrium vapour generation. The model in this present study considers that the instantaneous quality would relax to the equilibrium value over a given timescale which is calculated using the flow field values. A segregated approach linking the HRM and Σ − Y is implemented in a compressible formulation in an attempt to quantify the effects of flash boiling in the spray dynamics. The developed model is naturally implemented in RANS in a dedicated solver HRMSonicELSAFoam. Results from simulations of two-phase jets of different subcooled fluids through sharp-edged orifices show that the proposed approach can accurately simulate the primary atomisation and give reliable predictions for the droplet sizes and distribution. Strong effects of the flashing and turbulent mixing on the jet are demonstrated. The model istested for turbulent flows within small nozzles and was developed within the open source code OpenFOAM.DOI: http://dx.doi.org/10.4995/ILASS2017.2017.4667
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Bornschlegel, Sebastian, Chris Conrad, Lisa Eichhorn, and Michael Wensing. "Flashboiling atomization in nozzles for GDI engines." In ILASS2017 - 28th European Conference on Liquid Atomization and Spray Systems. Valencia: Universitat Politècnica València, 2017. http://dx.doi.org/10.4995/ilass2017.2017.4750.

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Flashboiling denotes the phenomenon of rapid evaporation and atomization at nozzles, which occurs when fluidsare injected into ambient pressure below their own vapor pressure. It happens in gasoline direct injection (GDI) engines at low loads, when the cylinder pressure is low during injection due to the closed throttle valve. The fuel temperature at the same time approaches cylinder head coolant temperature due to the longer dwell time of the fuel inside the injector. Flash boiling is mainly beneficial for atomization quality, since it produces small droplet sizes and relative broad and homogenous droplet distributions within the spray. Coherently, the penetration depth normally decreases due to the increased aerodynamic drag. Therefore the thermal properties of injectors are often designed to reach flash boiling conditions as early as possible. At the same time, flash boiling significantly increases the risk of undesired spray collapsing. In this case, neighbouring jets converge and form a single jet. Due to the now concentrated mass, penetration depth is enhanced again and can lead to liner or piston wetting in addition to the overall diminished mixture formation.In order to understand the underlying physics, it is important to study the occurring phenomena flashboiling and jet-to-jet interacting i.e. spray collapsing separately. To this end, single hole injectors are built up to allow for an isolated investigation of flashboiling. The rapid expansion at the nozzle outlet is visualized with a microscopic high speed setup and the forces that lead to the characteristic spray expansion are discussed. Moreover, the results on the macroscopic spray in terms of penetration, cone angles and vapor phase are shown with a high speed Schlieren setup. Resulting droplet diameters and velocities are measured using LDA/PDA.As a result, we find a comprehensive picture of flash boiling. The underlying physics can be described and discussed for the specific case of high pressure injection at engine relevant nozzle geometries and conditions, but independently from neighbouring jets. These findings provide the basis to understand and investigate flashboilingand jet-to-jet interaction as distinct, but interacting subjects rather than a combined phenomenon.DOI: http://dx.doi.org/10.4995/ILASS2017.2017.4750
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Reports on the topic "Evaporation Flash de Spray"

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Lee, Seong-Young, Jeffrey Naber, Mehdi Raessi, Roberto Torelli, Riccardo Scarcelli, and Sibendu Som. Evaporation Submodel Development for Volume of Fluid (eVOF) Method Applicable to Spray-Wall Interaction Including Film Characteristics with Validation at High Pressure and Temperature Conditions. Office of Scientific and Technical Information (OSTI), March 2020. http://dx.doi.org/10.2172/1608768.

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