A $0\mathrm{.}1m$ column is loaded with $5kg$ of sand. The size distribution is as

follows:

The density of sand was measured to be $2,600kg{m}^{-3}.$ The sand is to be

fluidized with air at $100C.$ Atmospheric pressure is $772mmHg.$ Estimate

the minimum fluidization velocity.

Calculate the composite particle diameter by means of the equation:

$d_p=\frac{1}{{\displaystyle \underset{?}{\overset{?}{}}}\frac{x_i}{d_{}}}$

Take the Viscosity of air at $100C=2\mathrm{.}1{10}^{-5}$ N$.$s$.$m ${?}^{-2}$

Density of air at $100C=0\mathrm{.}898kg*m^{-3}.$