Particle-laden turbulent flow is widely seen in the natural world and industrial applications, and thus studies on multiphase flows with particles are of great significance for improving the efficiency of industrial processes and environment protection. In the present study, the Euler–Lagrange direct numerical simulation based on the point-source-in-cell model was employed to calculate the dilute particle-laden flow in a vertical channel. The turbulence flowfield was obtained by directly solving the Navier–Stokes equation. The particle’s motion was described by the Basset–Boussinesq–Oseen equation, and the shear lift force and Magnus lift force were also included in the particle equation of motion. The main purpose was focused on the effect of interparticle collision, which was detected by using a deterministic method. It was found through investigation that interparticle collision has a significant effect on the particle-laden flow even when the particle’s volume fraction is very small [about O(10−4)]. Interparticle collision increases the near-wall particle velocity. The near-wall particle accumulation is decreased because interparticle collision can not only promote the particle migration from the near-wall region to the channel center but also change interphase forces. It was also found that interparticle collision has little effect on the mean velocity profile and the turbulence intensity of the gas phase. In addition, interparticle collision enhances the fluctuating intensities of particles in the wall-normal direction and spanwise direction. In the streamwise direction, the fluctuating intensity of particles is enhanced in the very-near-wall region and the channel center, while it is reduced in other regions by interparticle collision.


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    Title :

    Direct Numerical Study on Effect of Interparticle Collision in Particle-Laden Turbulence


    Contributors:

    Published in:

    AIAA journal ; 54 , 10 ; 3212-3222


    Publication date :

    2016




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English



    Classification :

    BKL:    50.93 / 55.50 Luftfahrzeugtechnik / 50.93 Weltraumforschung / 55.60 Raumfahrttechnik / 55.50 / 55.60
    Local classification TIB:    770/7040





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