| 国家重点基础研究发展规划 |
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| Numerical Simulation of Sampling Efficiency in a Sand Trap |
| AN Lei, HUANG Ning |
| Key Laboratory of Ministry of Education for Mechanics on Western Disaster and Environment, Lanzhou University, Lanzhou 730000, China |
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Abstract This paper makes a numerical simulation of the flowing characteristics and sampling efficiency of the Tubular Sand Trap for example in the sand flow structure. In order to make the simulation more truthful, we make the gridding better against the calculation domain, calculate wind field around sand trap, and analyze the effect of the gridding division to the calculation results. Through the analysis of the calculation results, we discuss the influence of different membrane permeabilities to wind field flowing and the calculation of the traces of different grain-sized particles as well as sand catcher efficiencies in the condition of different permeabilities. Based on simulation of sampling efficiency, we find that membrane permeabilities of sand trap is a vital factor of influence sampling efficiency, and through the analysis of the results, we find that choosing sand trap membrane we should choose permeability, for sampling efficiency tend to be steady with alteration of particles grain sizes. There are two key influence factors of sampling efficiency: the grain size and the streamline on the entrance of the sand catcher. When the grain sizes are comparatively big, it will be the inertia that plays the leading role, and the sampling efficiency are almost above 90% as for most of the particles with their average size of grains being 200 μm; when they are comparatively small, the streamline will be pivotal.
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Received: 12 December 2010
Published: 20 May 2011
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2011, Vol. 31 
