A finite element analysis of multiphase conjugated flow in diesel and biodiesel-driven engine filtration device
Journal of the Brazilian Society of Mechanical Sciences and Engineering
ABSTRACT:
Particle emission from biofuel consumption is analyzed and simulated, to obtain the main effects of this emission into the atmosphere, which may cause environmental and health damage. The continuous phase is numer- ically simulated through the Navier-Stokes equations coupled with the Darcy-Forchheimer model, for which the results are in accordance with the ones presented in the literature. For the solid dispersion calculation, a Lagrangian analysis is made, which provides a better understanding of each particle trajectory, therefore resulting in a one-way coupling Euler-Lagrangian numerical simulation. A numerical simulator is built using the Finite Element Method (FEM) and verified with some classi- cal cases in the literature. To simulate and compare particulate filtering mechanisms of diesel engines, the DPF (Diesel Particle Filter) model is used with particle size distribution referring to diesel and biodiesel, being possible to make a comparison in particulate pollutant emis- sions. Several filter geometries are evaluated, regarding their efficiency in particle retention rate, to obtain a different design of the filter that en- hances filtration efficiency, where the external steep-edged DPF has been shown to provide the best results. Thus, in this work, the finite element method is used to propose an optimization of each channel of the DPF, resulting in a lower particle emission for both diesel and biodiesel fuels.