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ISSN 打印: 1044-5110

ISSN 在线: 1936-2684

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Indexed in

AN ENGINEERING MODEL FOR THE FUEL SPRAY FORMATION OF DEFORMING DROPLETS

卷 14, 册 4, 2004, 51 pages
DOI: 10.1615/AtomizSpr.v14.i4.10
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摘要

A computational model for evaluating the formation of sprays from a liquid jet is developed. The dispersion of evaporating droplets in a spray in a simulated turbulent flow field is examined. A vaporization model is used for evaluating the evaporation rate of deforming ellipsoidal droplets. The instantaneous fluctuating fluid velocity and velocity gradient components at the centroid of the droplet are evaluated with the use of a probability density function (PDF)-based Langevin model. Motions of atomized fuel droplets are analyzed, and ensemble and time averaging are used for evaluating the statistical properties of the droplets. Effects of droplet deformation and breakup on the statistics of spray dispersion are studied. The trajectory statistics of evaporating and nonevaporating liquid ellipsoidal droplets are compared with those of solid particles and fluid point particles. The results show that the mean-square fluctuation velocities of the droplets vary significantly with their size and shape. Furthermore, the mean-square fluctuation velocities of the evaporating droplets differ somewhat from those of point and solid particles. Droplet turbulent diffusivities, however, are found to be close to the diffusivity of point particles. The formation of a spray in the absence of atomizing air is simulated. The model accounts for the evaporation, deformation, and breakup of liquid droplets in a turbulent spray. The droplet velocity, concentration, and size of the simulated spray are compared with the experimental data and qualitative agreement is observed.

对本文的引用
  1. Chen Wei, Chang Shih-Ying, Kiang San, Marchut Alexander, Lyngberg Olav, Wang Jennifer, Rao Venkatramana, Desai Divyakant, Stamato Howard, Early William, Modeling of Pan Coating Processes: Prediction of Tablet Content Uniformity and Determination of Critical Process Parameters, Journal of Pharmaceutical Sciences, 99, 7, 2010. Crossref

  2. Mehel Amine, Tanière Anne, Oesterlé Benoît, Fontaine Jean-Raymond, The influence of an anisotropic Langevin dispersion model on the prediction of micro- and nanoparticle deposition in wall-bounded turbulent flows, Journal of Aerosol Science, 41, 8, 2010. Crossref

  3. Tian Lin, Ahmadi Goodarz, Particle deposition in turbulent duct flows—comparisons of different model predictions, Journal of Aerosol Science, 38, 4, 2007. Crossref

  4. Tavakol M.M., Abouali O., Yaghoubi M., Ahmadi G., Stochastic dispersion of ellipsoidal fibers in various turbulent fields, Journal of Aerosol Science, 80, 2015. Crossref

  5. Talebizadeh P., Rahimzadeh H., Ahmadi G., Brown R., Inthavong K., Time history of diesel particle deposition in cylindrical dielectric barrier discharge reactors, Journal of Nanoparticle Research, 18, 12, 2016. Crossref

  6. Tavakol M.M., Ghahramani E., Abouali O., Yaghoubi M., Ahmadi G., Deposition fraction of ellipsoidal fibers in a model of human nasal cavity for laminar and turbulent flows, Journal of Aerosol Science, 113, 2017. Crossref

  7. Chen Wei, Wang Jennifer, Desai Divyakant, Chang Shih-Ying, Kiang San, Lyngberg Olav, A Strategy for Tablet Active Film Coating Formulation Development Using a Content Uniformity Model and Quality by Design Principles, in Comprehensive Quality by Design for Pharmaceutical Product Development and Manufacture, 2017. Crossref

  8. Schmidt David J., Kvasnak William, Ahmadi Goodarz, A Model for Fuel Spray Formation with Atomizing Air, Fluids, 4, 1, 2019. Crossref

  9. Ahmadi Goodarz, Computational Fluid Dynamics of Particle Transport and Deposition, in Developments in Surface Contamination and Cleaning, 2012. Crossref

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