@InProceedings{AssisFach:2014:DyFlNa,
               author = "Assis, Giovanna Querido Marcondes de and Fachini Filho, Fernando",
          affiliation = "{Universidade Federal de Itajub{\'a} (UNIFEI)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)}",
                title = "Dynamics of flame in narrow channel",
            booktitle = "Anais...",
                 year = "2014",
         organization = "Semin{\'a}rio de Inicia{\c{c}}{\~a}o Cient{\'{\i}}fica do 
                         INPE (SICINPE).",
            publisher = "INPE",
              address = "S{\~a}o Jos{\'e} dos Campos",
                 note = "{Bolsa PIBIC/INPE/CNPq}",
             keywords = "flames, narrow channel.",
             abstract = "We analyse premixed flames inside a narrow channel. This topic 
                         matters the most when it comes to security and propulsion. It's 
                         study started in order to analyze flames propagating in coal 
                         mines, contributing later on to chemical industries. 
                         Intrinsically, the problem is two-dimensional, but applying weight 
                         mean procedure, it is possible to describe the problem with 1D 
                         conservation equations making usage of convective heat transfer 
                         model. Considering the gas and solid phase conjugated problem, the 
                         system is adiabatic, then all heat transferred from the flame to 
                         the tube walls returns to the fuel mixture. As in most cases the 
                         heat conductivity in the solid phase is much faster than that in 
                         the gas phase, problem's description requires two main thermal 
                         zones with very different length scales. The largest scaled one is 
                         associated to solid phase conduction, while the smallest reefers 
                         to the gas phase. The analysis focused in showing the influence of 
                         these two thermal zones, once their differences contribute to the 
                         understanding of the propagation of heat on the channel wall and 
                         on the flame. Similar studies on this, however treated in porous 
                         media, show that the flame temperature will probably rise above 
                         the adiabatic values. Solving the particular equations of mass, 
                         energy and species conservation, it is used the method of singular 
                         perturbations (asymptotic expansion), mating outcomes for 
                         different regions. The perturbation theory provides solutions as 
                         series expansions having as parameter the ratio between the 
                         thermal conductivities of the solid and gas phases. Other 
                         parameters in the mathematical formulation are oxygen and fuel's 
                         Lewis numbers and also the convective heat transfer parameter. For 
                         conditions in which the convective heat transfer parameter is 
                         close to unit, the two phases are not in thermal equilibrium, so 
                         the heat circulation between phases happens largely and the flame 
                         temperature can reach up to twice the adiabatic temperature 
                         (theoretically estimated value). Further, a third region is 
                         analyzed along this work. It has a heat-reactive character and its 
                         length scale is appropriate to describe the flame inner structure. 
                         The inner region study coupled with the outer region one solves 
                         the problem.",
  conference-location = "S{\~a}o Jos{\'e} dos Campos",
      conference-year = "30-31 jul., 2014",
             language = "pt",
                  ibi = "8JMKD3MGP5W34M/3GTP9PH",
                  url = "http://urlib.net/ibi/8JMKD3MGP5W34M/3GTP9PH",
           targetfile = "Assis_dinamica.pdf",
        urlaccessdate = "27 abr. 2024"
}