Dispersion Of Solid Saltating Particles In A
Turbulent Boundary Layer
Author(s)
H. T. Wang, Z. B. Dong, X. H. Zhang & M. Ayrault
Abstract
A horizontal saltation layer of glass particles in air is investigated experimentally
both on a flat bed and over a two-dimensional ridge. Particle concentrations are
measured by Mie scattering diffusion. All the statistical moments of the particle
concentration are determined such as mean concentration, rms concentration
fluctuations, skewness and flatness coefficients. Measurements of particle
concentrations were made at the top of the ridge and in the cavity region. It is
confirmed that over a flat bed the mean concentration decreases exponentially
with height, the mean dispersion height H being of great meaning. It is shown
that the concentration distribution follows quite well a lognormal distribution. At
the top of the ridge, the saltation layer is decreased and the concentration
increased.
Keywords: particles, saltation, dispersion, turbulent boundary layer.
1 Introduction
Wind erosion is a major cause of soil degradation in arid and semi-arid areas and
deserts. It is therefore of great importance to analyze both experimentally and
theoretically the motion of wind-blown particles in order to develop effective
wind erosion modeling system for controlling the wind erosion of small
particles.
Saltation is the primary wind erosion mechanism. Initially aerodynamically
lifted off by the wind in short hops and although accelerated by the wind,
particles will return to the bed and will impact the ground, rebounding and/or
Keywords
particles, saltation, dispersion, turbulent boundary layer.
Related Book
Other papers in this volume
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