Wind tunnel experiments on the resuspension of particulate material |
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| Institution: | 1. Departamento de Minería, Facultad de Ciencias Físico Matemáticas y Naturales, Universidad Nacional de San Luis, Chacabuco 917, D5700HHW, San Luis, Argentina;2. INFAP, CONICET, Departamento de Física, Facultad de Ciencias Físico Matemáticas y Naturales, Universidad Nacional de San Luis, Ejército de los Andes 950, D5700HHW, San Luis, Argentina;1. Department of Geography and the Environment, University of North Texas, Denton, TX, 76203, USA;2. Department of Electrical Engineering, University of North Texas, Denton, TX, 76203, USA;3. Atmospheric and Earth Science Department, University of Alabama in Huntsville, Huntsville, AL, 35805, USA;1. Department of Civil Engineering, Construction Aerodynamics Laboratory, Federal University of Rio Grande do Sul, Porto Alegre, Brazil;2. Vento-S Consulting, Brazil;3. Department of Mechanical Engineering, Federal University of Rio Grande do Sul, Porto Alegre, Brazil;1. NRG, Utrechtseweg 310, Arnhem/Westerduinweg 3, Petten, The Netherlands;2. Institute of Nuclear and New Energy Technology, Collaborative Innovation Center of Advanced Nuclear Energy Technology, Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education, Tsinghua University, Beijing 100084, China |
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| Abstract: | A programme of wind tunnel experiments has been carried out in which the resuspension of particulate material of four sizes (4, 10, 18 and 22 μm diameter) from concrete and grass surfaces has been studied. The importance of wind speed has been investigated and the time dependence of the resuspension rate has been evaluated for periods shortly after the onset of resuspension. The results indicate rapidly falling values of the resuspension rate which are approximately related to 1/time. The increase in the resuspension rate with increasing wind speed was most pronounced for large particles, leading to the conclusion that resuspension can be dominated by short-duration episodes which coincide with conditions that favour resuspension. Resuspension rates, averaged over approximately 1 h after the onset of conditions leading to resuspension, were in the range 1 × 10−6 to 5 × 10−6 s−1, at moderate wind speeds (less than 5 m s−1), with little difference between the grass and concrete surfaces. For high wind speeds (greater than 6.5 m s−1), several per cent of the total surface deposit of 22 μ diameter particles was removed from both the concrete and grass surfaces within 10 s of the onset of wind. |
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