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Atomization and Sprays

Published 12 issues per year

ISSN Print: 1044-5110

ISSN Online: 1936-2684

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Indexed in

DROPLET SIZE AND VELOCITY MEASUREMENTS AT THE OUTLET OF A HOLLOW CONE SPRAY NOZZLE

Volume 21, Issue 11, 2011, pp. 893-905
DOI: 10.1615/AtomizSpr.2012004171
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ABSTRACT

During the course of a severe accident in a nuclear pressurized water reactor (PWR), hydrogen may be produced by reactor core oxidation and distributed into the containment. Spray systems are used in order to limit overpressure, enhance the gas mixing, avoid hydrogen accumulation, and wash out fission products. In order to simulate these phenomena with computational fluid dynamics codes, it is first necessary to know the droplet size and velocity distributions close to the outlet nozzle. Furthermore, since most of the phenomena relative to droplets (condensation, gas entrainment, and collisions) are of particular importance in the region just below the nozzle, accurate input data are needed for real-scale PWR calculations. The objective is, therefore, to determine experimentally these input data under atmospheric conditions. Experimental measurements were performed on a single spray nozzle, which is routinely set up in many PWRs. This nozzle is generally used with water at a relative pressure supply of 3.5 bar, producing a mass flow rate of approximately 1 kg/s. At a distance of 20 cm, in which under ambient conditions atomization is just achieved, it is found that the geometric mean diameter varies from 280 to 340 μm, the Sauter mean diameter varies from 430 to 520 μm, and the mean axial velocity varies from 14 to 20 m/s. The radial velocity is around 7 m/s, whereas the orthoradial velocity is almost equal to zero at this distance of the nozzle. Gas velocity measurements around the spray are also performed.

CITED BY
  1. Jain Manish, John Benny, Iyer K.N., Prabhu S.V., Characterization of the full cone pressure swirl spray nozzles for the nuclear reactor containment spray system, Nuclear Engineering and Design, 273, 2014. Crossref

  2. Malet J., Mimouni S., Manzini G., Xiao J., Vyskocil L., Siccama N.B., Huhtanen R., Gas entrainment by one single French PWR spray, SARNET-2 spray benchmark, Nuclear Engineering and Design, 282, 2015. Crossref

  3. Malet J., Parduba Z., Mimouni S., Travis J., Achievements of spray activities in nuclear reactor containments during the last decade, Annals of Nuclear Energy, 74, 2014. Crossref

  4. Foissac A., Malet J., Mimouni S., Ruyer P., Feuillebois F., Simonin O., Eulerian Simulation of Interacting PWR Sprays Including Droplet Collisions, Nuclear Technology, 181, 1, 2013. Crossref

  5. Ding Peng, Liu Yulan, Li Wanai, Wang Biao, Zhang Chunyu, Chen Meilan, Numerical investigation on the performance of the combined passive and spray cooling system under nuclear severe accident, Annals of Nuclear Energy, 105, 2017. Crossref

  6. Mimouni Stephane, Benguigui William, Fleau Solène, Foissac Arnaud, Guingo Mathieu, Hassanaly Mickael, Lavieville Jérôme, Malet Jeanne, Méchitoua Namane, Mérigoux Nicolas, Vincent Stéphane, Dispersed Two-Phase Flow Modelling for Nuclear Safety in the NEPTUNE_CFD Code, Science and Technology of Nuclear Installations, 2017, 2017. Crossref

  7. Paranjape Sidharth, Mignot Guillaume, Kapulla Ralf, Paladino Domenico, Experimental investigation of gas transport induced by containment spray activation during a scaled severe accident scenario, Nuclear Engineering and Design, 342, 2019. Crossref

  8. Gai Guodong, Kudriakov Sergey, Hadjadj Abdellah, Studer Etienne, Thomine Olivier, Modeling pressure loads during a premixed hydrogen combustion in the presence of water spray, International Journal of Hydrogen Energy, 44, 10, 2019. Crossref

  9. Gai Guodong, Thomine Olivier, Hadjadj Abdellah, Kudriakov Sergey, Modeling of particle cloud dispersion in compressible gas flows with shock waves, Physics of Fluids, 32, 2, 2020. Crossref

  10. Gai G., Thomine O., Kudriakov S., Hadjadj A., A new formulation of a spray dispersion model for particle/droplet-laden flows subjected to shock waves, Journal of Fluid Mechanics, 905, 2020. Crossref

  11. Sh. Essa Mohammed, Chiad Bahaa T., Hadi Zaid L., NiO Thin Layers Prepared via Computerized Spraying System, Journal of Physics: Conference Series, 1279, 1, 2019. Crossref

  12. Sun Haomin, Leblois Yohan, Gelain Thomas, Porcheron Emmanuel, Experimental and analytical investigations on aerosol washout in a large vessel with high spray coverage ratio simulating PWR containment spray, Journal of Nuclear Science and Technology, 2022. Crossref

  13. Gai Guodong, Kudriakov Sergey, Rogg Bernd, Hadjadj Abdellah, Studer Etienne, Thomine Olivier, Numerical study on laminar flame velocity of hydrogen-air combustion under water spray effects, International Journal of Hydrogen Energy, 44, 31, 2019. Crossref

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