Abstract: In the present paper, flow characteristics of laminar near-wall boundary layer in dusty atmosphere and the effects of airborne dust on friction coefficient are investigated. The two-way coupling model is employed for the gas-particle system where both the two phases are considered as a continuum medium. The velocity profiles of the two phases and their time developments are obtained. Based on the numerical simulation results, the dynamic behaviors of surface friction under different initial movement conditions and mass loading ratios of suspended sand are discussed in detail.

Key words: gas-particle two-phase flow, laminar sub-layer, friction coefficient, airborne dust