A bed of spherical particles (specific gravity 2.5) of uniform size 1500 μm is 0.5 m in diameter and 0.5 m high. In packed bed state, the porosity may be taken as 0.4. Ergun's equation for the above fluid-particle system (in SI units) is given below : Δ P/L = 375 x 10^3 VOM + 10.94 x 10^6 V2 OM (SI units) If water is to be used as the fluidising medium, the minimum fluidisation velocity, VOM is_________________?
Correct answer: B. 16 mm/s
- A. 12 mm/s
- B. 16 mm/s
- C. 24 mm/s
- D. 28 mm/s
Explanation
At minimum fluidisation, the Ergun pressure gradient equals the effective particle weight, approximately (2500−1000)(1−0.4)g = 8829 Pa/m. Substitution into the given equation gives VOM ≈ 0.016 m/s, or 16 mm/s.
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