Modeling heat transfer in dilute two-phase flows using the Mesoscopic Eulerian Formalism

Jérôme Dombard (1) , Benoît Leveugle (2) , Laurent Selle (1) , Julien Reveillon (2) , Thierry Poinsot (1) , Yves d'Angelo (2)

1 IMFT - Institut de mécanique des fluides de Toulouse
2 CORIA - Complexe de recherche interprofessionnel en aérothermochimie

In dilute two-phase flows, accurate prediction of the temperature of the dis- persed phase can be of paramount importance. Indeed, processes such as evaporation or chemical reactions are strongly non-linear functions of heat transfer between the carrier and dispersed phases. This study is devoted to the validation of an Eulerian description of the dispersed phase -the Meso- scopic Eulerian Formalism (MEF)- in the case of non-isothermal flows. Di- rect numerical simulations using the MEF are compared to a reference La- grangian simulation for a two-dimensional non-isothermal turbulent jet laden with solid particles. The objectives of this paper are (1) to study the influ- ence of the thermal inertia of particles on their temperature distribution and (2) conduct an a posteriori validation of the MEF, which was recently ex- tended to non-isothermal flows. The focus is on the influence of additional terms in the MEF governing equations, namely heat fluxes arising from the Random Uncorrelated Motion (RUM). Results show that mean and rms of particle temperature are strongly dependent of the thermal Stokes number. The mean temperature is satisfactorily predicted by the MEF, comparing to the Lagrangian reference. Under the conditions of the present study, the RUM heat fluxes have a marginal influence on the mean particle tempera- ture. However, a significant impact was observed on the magnitude of particle temperature fluctuations. Neglecting the RUM heat fluxes leads to erroneous results while the Lagrangian statistics are recovered when it is accounted for in the regimes of low to moderate thermal Stokes number.

Mots clés: Particle-laden flows; Mesoscopic Eulerian Formalism; Eulerian-Eulerian approach; Heat transfer

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

Jérôme Dombard, Benoît Leveugle, Laurent Selle, Julien Reveillon, Thierry Poinsot, et al.. Modeling heat transfer in dilute two-phase flows using the Mesoscopic Eulerian Formalism. International Journal of Heat and Mass Transfer, 2012, vol. 55, pp.1486-1495. ⟨10.1016/j.ijheatmasstransfer.2011.10.050⟩. ⟨hal-00811401⟩