Comptes Rendus
Experimental determination of the concentration Probability Density Function for a saltating particle layer
Comptes Rendus. Mécanique, Volume 334 (2006) no. 1, pp. 13-18.

A horizontal saltation layer of glass particles in air was investigated experimentally in a wind tunnel. Particle concentrations are measured by light scattering diffusion and image processing and all the statistical characteristics were evaluated and thus the probability density function. Our experimental results confirm that the mean concentration decreases exponentially with height, the mean Eulerian dispersion height H being a characteristic lengthscale and that the instantaneous concentration distribution c˜(x,t) is a random variable following quite well a lognormal distribution.

La dispersion de particules de verre en mouvement de saltation à l'intérieur d'une couche limite turbulente est étudiée expérimentalement. Les concentrations ont été déterminées par diffusion de la lumière et analyse d'images. Certaines caractéristiques statistiques ont été mesurées telles les concentrations moyennes, les différents moments statistiques ainsi que les densités de probabilité. Les résultats expérimentaux confirment que la concentration moyenne décroît exponentiellement avec la hauteur, la hauteur moyenne de dispersion eulérienne H étant une échelle de longueur caractéristique. On montre en plus que la distribution de concentration instantanée c˜(x,t) est une variable aléatoire qui suit une loi de distribution Lognormale.

Received:
Accepted:
Published online:
DOI: 10.1016/j.crme.2005.10.017
Keywords: Granular media, Turbulence, Saltation, Dispersion, Solid particles
Mots-clés : Milieux granulaires, Turbulence, Saltation, Dispersion, Particules solides

XiaoHang Zhang 1, 2; HongTao Wang 3; ZhiBao Dong 3; Michel Ayrault 2

1 Turbulence Laboratory, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China
2 Laboratoire de mécanique des fluides et d'acoustique, UMR CNRS 5509, ECL, 69131 Ecully, France
3 Key Laboratory of Desert and Desertification, CAREERI, CAS, Lanzhou Gansu 730000, China
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XiaoHang Zhang; HongTao Wang; ZhiBao Dong; Michel Ayrault. Experimental determination of the concentration Probability Density Function for a saltating particle layer. Comptes Rendus. Mécanique, Volume 334 (2006) no. 1, pp. 13-18. doi : 10.1016/j.crme.2005.10.017. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2005.10.017/

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