Abstract
The authors have developed a new numerical analysis method based on Euler-Lagrange Coupling to clarify the soot deposition phenomenon on Exhaust Gas Recirculation (referred to as EGR) cooler for diesel engines. Cooled EGR system with a heat exchanger (EGR cooler) for diesel engines has been used for emission improvement for a long time. Since diesel engines tend to generate much soot, however, the performance of the EGR cooler is likely to decrease due to the deposited soot. The flow of EGR gas is computed by Eulerian method and the soot particles are simulated due to Lagrangian approach. Because this new analysis is combined the merits of each method, the present authors call this procedure as Multiphysics simulation. The trajectory of soot particles was analyzed and the situation of accumulation by thermophoretic force was clarified. Then changes in heat transfer due to deposited soot were compared in various fin shapes. The authors found that the thermophoretic force and the generation of longitudinal vortices are important for reasonably simulating the soot deposition phenomenon.
