The dynamics of polydisperse spray fuel in thermal explosion processes

Abstract

The dynamics of the particle-size distribution (PSD) of the polydispersed fuel is important for evaluation of the combustion process. In this paper we unfold the mystery of the dynamics represented by the PSD and gain new insight for the droplet behavior during the ignition process. A simplified model of the polydispersity is used for describing the system near the linear region, which evolves time depended function which describes the PSD. We examine the PSD uctuation in time of the initial PSD described by the experimental as well as the Rosin-Rammler, Nukiyama-Tanasawa and the gamma distributions approximations. The results shows that the during the ignition process the droplets radii decrease as expected, yet the number of the smaller droplet increase in inverse proportion to the radius. An important novel result visualized by the graph, is the average radius of the droplets which first increases for shot time following by decreasing. The last result show the maximum of average radius is not located at the beginning of the process as expected. The algorithm presented here is superior to the parcel approach, since it can be applied for any approximation of the PSD, with negligible computation time.