Critical gas velocity required for complete suspension of solid particles in solid-suspended bubble column with draught tube.

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The critical gas velocity required for complete suspension of solid particles was studied experimentally in a solid-suspended bubble column with a draught tube. It was shown that the critical gas velocity increases with increasing terminal velocity of a single particle, solid concentration, liquid surface tension, diameter of gas distributor and density difference between solid and liquid, and decreases with increasing column diameter and liquid viscosity.<br> Based on these observations, an empirical equation for critical gas velocity is proposed that is applicable to columns with diameters of 0.1-0.3 m.

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