相対速度を有する大粒径粒子を含む鉛直上昇噴流の乱流特性(流体工学,流体機械)

概要

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The turbulence structure of the liquid-solid vertical jet flows impinging on a flat plate has been experimentally investigated. The diameter of the particles is nearly ten times as large as the Kolmogorov length scale and the volumetric concentration of the dispersed phase was set at 0.13%. The particle speed is about 45% of the liquid velocity at the nozzle outlet. As a result of the measurements with LDA and PIV systems, it was shown that the turbulent intensity in the carrier fluid has been enhanced due to the effect of the large-scale particles. The increase of power spectra and dissipation spectra has been clearly found in the high wavenumber range, which corresponds to the particle length scale. Since the energy variation evaluated by the model, in which turbulence modification is caused by particle wake eddies, is equivalent to the measured values, it can be concluded that the turbulence enhancement is mainly caused by the wakes behind the particles.
一般社団法人日本機械学会の論文
2003-03-25