高流速循環流動層における乱流流動化の移行条件

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  • Criteria of transition to turbulent fluidization in the high-velocity circulating fluidized bed.
  • コウ リュウソク ジュンカン リュウドウソウ ニ オケル ランリュウ リュウド

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It is demonstrated that a transient regime, where turbulent fluidized behavior is observed between rising slugs, exists between slugging and turbulent fluidizations.<BR>Besed on observation of average vertical pressure profile in the bed and FFT analysis of its fluctuation, new criteria are proposed to classify higher-gas velocity fluidization regimes such as slugging, transient, turbulent and dilute-phass regime including fast fluidization.<BR>To determine these fluidized regimes approximately from the measurement of pressure fluctuation in the bed, a simple method is also proposed.<BR>It is found that the critical Rep number between each regime, observed under both atmospheric and high-pressure conditions, can be correlated considerably well as functions of Ar number.

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