Effect of Pulsating Gas Injection on Granular Flow in Gas-Solid Fluidized Beds.

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  • 流動層内の粒子流動特性に及ぼす気流脈動の影響
  • リュウドウソウ ナイ ノ リュウシ リュウドウ トクセイ ニ オヨボス キリュウ ミャクドウ ノ エイキョウ

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Abstract

We performed two-dimensional DEM simulation to investigate the effcts of pulsating gas injection on the flows in dense gas-solid fluidized bed. Geldart D particles were assumed as the solid particles. The effects of the mean gas velocity, the frequncy and the amplitude of the gas injestion were examined. To evaluate the effects quantitatively, we analyzed the transport properties of the predicted granular flows, such as granular convection energy or fluctuating energy of particles. The present simulation showed that the pulsation promotes the granular convection for moderate pulsation frequencies and the predicted flow properties saturated for the variation of the pulsation frequencies in the high frequency region. We proposed an equation to estimate the relaxation time scale of the beds for the fluctuation of gas velocity based on Ergun's equation. The estimated relaxation time scale agreed well with the predicted saturation frequency of the bed.

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