Particle modulations to turbulence in two-phase round jets

• Published in: Acta mechanica Sinica 2009-10, Vol.25 (5), p.611-617
• Main Authors: Wang, Bing, Zhang, Huiqiang, Liu, Yi, Yan, Xiaofen, Wang, Xilin
• Format: Article
• Language: English
• Subjects: Attenuation; Classical and Continuum Physics; Computational Intelligence; Dissipation; Engineering; Engineering Fluid Dynamics; Fluid dynamics; Fluid flow; Jets; Modulation; PDA; Phase doppler anemometer; Research Paper; Reynolds number; Slip; Slip velocity; Theoretical and Applied Mechanics; Transport; Turbulence; Turbulence intensity; Turbulent flow; Two phase; Velocity measurement; 小颗粒; 湍流实验; 湍流强度; 滑移速度; 相位多普勒测速仪; 衰减测量; 速度测量
• ISSN: 0567-7718; 1614-3116
• DOI: 10.1007/s10409-009-0267-1

The particle modulations to turbulence in round jets were experimentally studied by means of two-phase velocity measurements with Phase Doppler Anemometer （PDA）. Laden with very large particles, no significant attenuations of turbulence intensities were measured in the farfields, due to small two-phase slip velocities and particle Reynolds number. The gas-phase turbulence is enhanced by particles in the near-fields, but it is significantly attenuated by the small particles in the far-fields. The smaller particles have a more profound effect on the attenuation of turbulence intensities. The enhancements or attenuations of turbulence intensities in the far-fields depends on the energy production, transport and dissipation mechanisms between the two phases, which are determined by the particle prop- erties and two-phase velocity slips. The non-dimensional parameter CTI is introduced to represent the change of turbulence intensity.