秋气
Pha Doppler anemometry measurements and analysis of turbulence modulation in dilute gas–solid two-pha shear flows
数学迷宫期刊名称： Journal of Fluid Mechanics
国库集中支付制度作者： LI, FEI, QI, HAIYING, YOU, CHANGFU张骞通西域
澳洲维多利亚大学
新挑战年份： 2010年
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关键词： particle/fluid flows; turbulent flows
摘要：Flow velocities of a dilute gas–solid two-pha flow in a vertical sudden expansion were measured using pha Doppler anemometry to study the behaviour of the turbulence modulation for the stronger shear for various particle mass loadings, inlet Reynolds numbers and particle diameters. The measurements show that the particles changed the gas turbulence by elongation of the entire gas flow field in the downstream direction, which displaced the axial profile of the ction-averaged fluctuation velocity in comparison with that of the single-pha flow, and by either the particle inertia re我得
ducing the local turbulence or the wake eddy effects enhancing the turbulence. Both mechanisms resulted in an apparent turbulence modulation, which has not been referred to in the related literature, and have led to an ambiguous
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