Numerical simulation of particle breakup/coalescence processes in shock waves

The numerical simulations to assess particle breakup/coalescence processes while passing through oblique shocks are performed. Gas-particle two phase flow are addressed by one-way coupled population balance equation (PBE) using the direct quadrature method of moments (DQMOM) for heterogeneous particles. Air-water droplet system is solved within the flow field over the 2-d wedge-shaped bodies (10 and 15 deg). The current study focuses on quantifying the effect of particle phase characteristics (0.05 μm < D₄₃ < 0.45 μm, 0.05 < m_f < 0.45) before the oblique shock on the particle size after the shock. The effect of shock strength by changing inflow Mach number (1.5 < M₁ < 2.5) is assessed too. It is observed that the collision processes occurs when inflow particle D₄₃ is 0.05 μm in all currently considered shock waves. Collision-breakup interface within the flow field behind the shock wave is identified too.