Particle concentration distribution in a gas–droplet confined swirling flow: Euler and Lagrange approaches

This paper considers the problem of the numerical simulation of the propagation dynamics of a dispersed admixture and heat transfer in a swirling turbulent gas–droplet flow behind a sudden tube expansion. The gas phase is described by a system of three-dimensional Reynolds-Averaged Navier-Stokes equations with taking into account the effect of particles on the transport processes in the carrier phase. The gasphase turbulence is calculated with the Reynolds stress transport model with allowance for the effect of the dispersed phase. The Euler and Lagrangian descriptions give qualitatively similar results for small droplet sizes of up to $d_1 \le 30~\mu$m; it is only for the largest particles studied in this paper (with an initial diameter of $d_1 = 100~\mu$m) did the difference in the calculation results exceed $15\%$.