Interphase heat transfer in radiatively heated particle-laden turbulent channel flows
We investigated the interphase heat transfer characteristics in vertical turbulent channel flows laden with radiatively heated inertial particles considering the gravity of particles.Direct numerical simulation(DNS)combined with a Lagrangian point-particle strategy was carried out in the range of radiation intensity 1 ≤ q/q0 ≤ 20 and the Stokes number of particles 0.36 × 10-1 ≤ Stf ≤ 2.16 × 10-1 for particle diameter 33 μm ≤ dp ≤ 81 μm.A two-way coupling model was adopted in which the momentum and heat exchange between the dispersed phase and the carrier phase were fully taken into account.It was found that when particles with small diameters encountered strong radiation significantly altered the heat transfer,so the fluid bulk temperature was remarkably heated.The theoretical expressions of the Nusselt number at the cold plate and the hot plate were derived from the time-average temperature equation of the fluid,which revealed that the interphase heat transfer caused the difference in heat transfer between the cold plate and the hot plate.We further found that interphase heat transfer increased linearly with the reciprocal of the particle diameter and the radiation intensity under the same mass fraction of particles.
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