Abstract
The shelter effect of porous wind breakers over a row of coal piles is studied in a wind tunnel. Two sets of tests are described in the paper, one performed in two dimensional configuration in which the shelter effect of several barriers with different heights and porosities is evaluated. In the other the effect of wind direction is considered using a tridimensional model. Wall shear-stress measurements performed with a hot-film sensor allowed the characterization of the transport properties of fine particles of coal. By integration of the local wind properties the rates of pollutant emission were determined leading to the conclusion of an effective shelter action of the porous wind breakers.
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