@Article{MachadoCostOlivHete:2023:SuHePu,
               author = "Machado, Danilo Almeida and Costa, Fernando de Souza and Oliveira, 
                         Antonio Carlos de and Hetem J{\'u}nior, Annibal",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Instituto de Estudos 
                         Avan{\c{c}}ados (IEAv)} and {Universidade Federal do ABC 
                         (UFABC)}",
                title = "Sulfur hexafluoride pulsed jet visualization by the Resonant 
                         Schlieren method",
              journal = "Optics Continuum",
                 year = "2023",
               volume = "2",
               number = "1",
                pages = "205--215",
                month = "Jan.",
             abstract = "Resonant Schlieren technique combines the variation of the 
                         refractive index of the medium with the absorption of seeded 
                         particles, thus producing high contrast images. It presents low 
                         cost and a relatively easy implementation and operation, and 
                         allows visualization of low and high-density flows. This paper 
                         describes the application of the Resonant Schlieren method to 
                         visualize a pulsed free jet of sulfur hexafluoride. A 
                         piezoelectric valve with a duty cycle of 10 Hz and pulse width of 
                         2 ms was used to control the flow through a nozzle with 1 mm 
                         diameter. Pressures in a vacuum chamber with optical windows were 
                         varied from 20 mbar to 1 bar and the flow was seeded with iodine 
                         molecules in order to increase the gas refractive index. The 
                         Schlieren images of the expanded flows presented a high contrast 
                         and the measured pulsed jet front velocities varied from 3 to 166 
                         m/s, from subsonic to supersonic flow regimes. Numerical 
                         simulations were performed using the lattice Boltzmann method and 
                         the theoretical results showed a good agreement with experimental 
                         data.",
                  doi = "10.1364/OPTCON.474915",
                  url = "http://dx.doi.org/10.1364/OPTCON.474915",
                 issn = "2770-0208",
             language = "en",
           targetfile = "optcon-2-1-205.pdf",
        urlaccessdate = "11 maio 2024"
}