The dependence of particle deposition velocity on particle inertia in turbulent pipe flow

摘要: Abstract Recent measurements of particle deposition velocities on the walls a pipe in turbulent flow (Liu and Agarwal, 1974) show decline with increasing size beyond critical size. A stochastic model is presented which explains this result. As other models, process composed diffusion, together inertial projection through boundary layer; model, both processes are inertia dependent, opposing ways. The observed due to increased fractional penetration layer being insufficient compensate for reduced rate transport that region. simple expression given velocity terms r.m.s. at point layer. dependence expressed particle's response fluctuations its neighbouring fluid by relating spectral densities using linear dimensionless form equation motion particle. based Stokes' drag quiescent fluid. profile shows good agreement experiments Liu Agarwal.