LAGRANGIAN MODEL ON THE TURBULENT MOTION OF SMALL SOLID PARTICLE IN TURBULENT BOUNDARY-LAYER FLOWS

The Lagrangian equations of motion of small particle in turbulent boun dary layer flows, taking into account the effects of the drug force ca used by the wall presence, the Saffman and the Magus lift forces et al ., is studied. Using the spectral method, analytical expression relati ng to the Lagrangian power spectra of particle velocity to that of the fluid are developed and the results are used to evaluate various resp onses statistics. In this paper, the results clearly show that the tur bulent diffusivity of the particle may be larger than that of the flui d for a period of long-time.