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How would one determine if a fluidised bed (with liquid flow) is determined to be a stable fluidised bed, which subsequently doesn't form a plug or bed at the top of a column (bounded by frits), when under pressure?

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Use flow (which is a product of pressure).

If a single solid will be entrained at the flow rate then it will plug.

If the bed has a packing factor of 50% then flow velocity in the bed is twice pipe flow velocity. As the bed fluidizes the packing factor goes down as does flow velocity.

VelocityPacking = VelocityPipe / (1 - packing)

The smaller particles will be lost (plug) first.

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  • $\begingroup$ Thanks for your answer. Do you mean flow in the bed should be set to double the standard pipe flow, assuming no packing, or that at a flow rate x, the experienced bed flow will be 2x? $\endgroup$
    – Beerhunter
    May 9 '18 at 11:35

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