Effect of particles on turbulent thermal field of channel flow with different Prandtl numbers

doi:10.1007/s10483-016-2112-8

Abstract

Abstract:

The direct numerical simulation (DNS) of heat transfer in a fully developed non-isothermal particle-laden turbulent channel flow is performed. The focus of this paper is on the modulation of the particles on turbulent thermal statistics in the particle-laden flow with three Prandtl numbers (Pr=0.71, 1.5, and 3.0) and a shear Reynolds number (Re_τ=180). Some typical thermal statistics, including normalized mean temperature and their fluctuations, turbulent heat fluxes, Nusselt number and so on, are analyzed. The results show that the particles have less effects on turbulent thermal fields with the increase of Prandtl number. Two reasons can explain this. First, the correlation between fluid thermal field and velocity field decreases as the Prandtl number increases, and the modulation of turbulent velocity field induced by the particles has less influence on the turbulent thermal field. Second, the heat exchange between turbulence and particles decreases for the particle-laden flow with the larger Prandtl number, and the thermal feedback of the particles to turbulence becomes weak.

Key words: particle, thermal statistic, Prandtl number, channel flow, direct numerical simulation (DNS)

2010 MSC Number:

76T20

Caixi LIU, Yuhong DONG. Effect of particles on turbulent thermal field of channel flow with different Prandtl numbers. Applied Mathematics and Mechanics (English Edition), 2016, 37(8): 987-998.

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