| 2010年烟台沙漠学术研讨会论文选 |
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| A Concept Model of Dynamic Evolution of Aeolian Sand Particles Entrainment in Terms of Turbulence Structure |
| MEI Fan-min1,2 |
| 1.School of Chemical and Environmental Engineering, Xi’an Polytechnic University, Xi’an 710048, China; 2.State Key Lab of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China |
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Abstract A concept model of dynamic evolution of aeolian sand particles entrainment in terms of turbulence structure is proposed. Wind-sand two phase flows always evolve dynamically from an equilibrium state to a non-equilibrium and returning to a new equilibrium state when the two phase flows are controlled alternatively by occurrences of burst-sweep cycles, turbulence random fluctuations, momentum losses of saltation particles' collision. During the dynamic processes, averaged aerodynamic entrainment could alternate with typical collision entrainment, turbulence burst entrainment. These types of sand particles entrainment can be identified on basis of kinematic shear stress of wall and momentum losses of saltation particles' collision. The model need being validated by making use of technologies of Phase Doppler Particle Analyzer, Particle Imagine Velocimetry and High-speed Digital Photography.
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Received: 14 July 2010
Published: 20 March 2011
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2011, Vol. 31 
