Q$2.$ Calculate the minimum fluidization velocity $u_{m0}$ for a bed of crushed anthracite coal fluidized by gas. $)=(0\mathrm{.}60$

Data

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

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