Measurements and predictions of turbulence generation in homogeneous particle-laden flows

J. H. Chen, G. M. Faeth

Research output: Contribution to conferencePaper

Abstract

The overall properties of turbulence generated by uniform fluxes of monodisperse spherical particles moving through a uniform flowing gas were studied both theoretically and experimentally. Mean and fluctuating values, probability density functions and energy spectra of streamwise and cross-stream velocities were measured within a counter-flowing particle/air wind tunnel using laser velocimetry. Test conditions included nearly monodisperse glass spheres having diameters of 0.5, 1.1 and 2.2 mm, particle Reynolds numbers of 106, 373 and 990, mean particle spacings of 13-208 mm, particle volume fractions less than 0.003%, and direct rates of dissipation of turbulence by particles less than 4%. Velocity fluctuations and PDFs were predicted using volume fraction weighted conditional averages of the properties of the wake disturbances and the turbulent inter-wake region. The relative turbulence intensities were correlated with a dimensionless dissipation factor developed during a previous study of inter-wake turbulence. The PDFs of streamwise velocities were not Gaussian, with negative skewness and higher kurtosis than a Gaussian distribution due to the presence of wake disturbances. The measurements and predictions of the above properties agree with each other very well. Finally, the streamwise energy spectra demonstrate both -1 and -5/3 decay regions, with the former resulting from contributions due to the presence of the laminar-like turbulent wakes of particles.

Original languageEnglish
Publication statusPublished - 2000 Dec 1
Event38th Aerospace Sciences Meeting and Exhibit 2000 - Reno, NV, United States
Duration: 2000 Jan 102000 Jan 13

Other

Other38th Aerospace Sciences Meeting and Exhibit 2000
CountryUnited States
CityReno, NV
Period00-01-1000-01-13

    Fingerprint

All Science Journal Classification (ASJC) codes

  • Space and Planetary Science
  • Aerospace Engineering

Cite this

Chen, J. H., & Faeth, G. M. (2000). Measurements and predictions of turbulence generation in homogeneous particle-laden flows. Paper presented at 38th Aerospace Sciences Meeting and Exhibit 2000, Reno, NV, United States.