Density effect on the phase interaction mechanism of binary particle mixture in gas-particle swirling co-axial jets

Gas-particle swirling flow plays a pivotal role in various industrial applications, necessitating a comprehensive investigation. This study extends the application of a coupled computational fluid dynamics and discrete element method to simulate the gas-particle swirling flow within an industrial-scale annulus. The established model is employed to dissect the influence of powder density on particle-scale attributes. The outcomes affirm the downward spiral of particles in the mixing zone, accentuated by observable density-driven segregation. Particles of lower density, endowed with elevated velocities, tend to accumulate primarily in peripheral domain. The convective heat transfer occurs between swirling flow with higher-temperature and the particles with comparatively lower-temperature fosters an elevation in particle temperature, particularly in the peripheral sector. Enlarging the powder density curbs particle agitation by the swirling flow, yielding a corresponding reduction in particle temperature. Lower-density particles density exhibit higher temperatures yet possess smaller Nusselt numbers in comparison to their higher-density counterparts.