Abstract
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 far-fields, 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 properties and two-phase velocity slips. The non-dimensional parameter CTI is introduced to represent the change of turbulence intensity.
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The project partially supported by the National Natural Science Foundation of China (50876053 and 50706021).
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Wang, B., Zhang, H., Liu, Y. et al. Particle modulations to turbulence in two-phase round jets. Acta Mech Sin 25, 611–617 (2009). https://doi.org/10.1007/s10409-009-0267-1
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DOI: https://doi.org/10.1007/s10409-009-0267-1