| 国家重点基础研究发展规划 |
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| Influence of Rotation Rate of Sand Particles on Measurement Results by PIV in Wind Sand Flux |
| YAN Jie, XIE Li |
| Key Laboratory of Ministry of Education for Mechanics on Western Disaster and Environment; School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, China |
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Abstract In this paper, based on the measurement principle of particle image velocimetry (PIV), we analyze the measurement error of PIV. For two frame images of a single sand particle taken by charge-coupled device (CCD) camera at an interval of a pulse time, we calculate the displacement of the mass center of the sand particle and the displacement of the center of image, and calculate the difference between the displacements of the two centers. Then we derive the error's formulas of sand particle velocity and sand particle diameter measurement used by PIV due to the sand particle rotation. It indicates that the velocity error measured by PIV relates to the velocity of sand particles, and the higher is the velocity of sand particles, the larger is the error. The maximum error of velocity measurement by PIV is not beyond 10%, and the measurement error can be decreased by increasing the pulse time. For a single irregular sand particle, the diameters measured by PIV at different moment are not same due to the rotation of sand particles, and the differences among the measurement errors of particle diameters depend on the sand shapes. For lager sand particle, it is pointed out that there is a long way to validate diameter measurement.
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Received: 10 December 2010
Published: 20 May 2011
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2011, Vol. 31 
