A spatial particle correlation-function analysis in non-isothermal dilute particle-laden turbulent flows

Enrica Masi (1) , Pascal Fede (1) , Olivier Simonin (1)

1 IMFT - Institut de mécanique des fluides de Toulouse

In dilute gas-solid turbulent flows, as that encountered, for example, in pulverized coal combustion processes, the correct prediction of the non-isothermal/reactive particle-laden turbulent mixture relies on the accuracy of the modeling of the local and unsteady particle behavior, which affects the hydro-thermodynamic coupling and the heat transfer and transport in and between the phases and at wall. In very dilute mixtures composed of highly inertial solid particles, such a local and unsteady behavior is the result of the particle interactions with very distant and independent turbulent eddies, namely with different dynamic and thermal turbulent scales. Such interactions strongly modify the local particle velocity and temperature distributions, changing the local evolution of the properties of the dispersed phase. Their knowledge is thus crucial when modeling unsteady particle-laden turbulent flows. In this work, the focus is on the particle temperature distribution. Its characterization is provided by means of an analysis of the two-particle correlation functions in the frame of the direct numerical simulation of non-isothermal homogeneous isotropic, statistically stationary, turbulent flows.

Mots clés: Particle-laden turbulent flows- Non-isothermal flows; Very dilute regime

Domaines: Mécanique des fluides [physics.class-ph]

Enrica Masi, Pascal Fede, Olivier Simonin. A spatial particle correlation-function analysis in non-isothermal dilute particle-laden turbulent flows. 9th International Conference on Multiphase Flow (ICMF 2016), May 2016, Firenze, Italy. pp. 1-6. ⟨hal-01715390⟩