Abstract
A turbulence structure has been experimentally investigated in the particle-laden vertical jet flows impinging on a horizontal flat plate. The diameter of the particles is nearly ten times as large as the Kolmogorov length scale. In experiments, the volumetric concentration c of the dispersed phase was set at 0.08% and 0.13%. In addition, the distance H between the nozzle outlet and the impinging wall was widely varied, thereby varying H/D from 10 to 30, where D is the nozzle diameter. The characteristic flow patterns and turbulent quantities were measured with a Laser Doppler Anemometer (LDA). As a result, it has been confirmed that the turbulent intensity in the carrier fluid has been enhanced due to the existence of the large-scale particles. In the wavenumber space, the power spectra have been clearly enhanced mainly in the high wavenumber range, which corresponds to the particle length scale.
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