PROBLEMS

Calculate the minimum fluidizing velocity $u_{mf}$ for a bed of crushed

anthracite coal fluidized by gas.

$($a$)$ Use information on ${}_s$ and ${}_{mf}.$

$($b$)$ Do not use information on ${}_s$ and ${}_{mf}.$

Data

Solids: $,{}_s=2\frac{g}{c}{m}^3,d_p=100m,{}_s=0\mathrm{.}63$

Gas: $,{}_g=1\mathrm{.}22{10}^{-3}\frac{g}{c}{m}^3,=1\mathrm{.}8{10}^{-4}\frac{g}{c}m*s$

${}_{mf}=0\mathrm{.}60.$