The surface area and volume of a solid particle are at $2\mathrm{.}5{10}^{-7}{m}^2$ and $5\mathrm{.}0{10}^{-12}{m}^3$ respectively.

Density of the solid is $1200k\frac{g}{m}3.$ Calculate:

a$.$ The sphericity of the particle

Ans: $0\mathrm{.}57$ say at $0\mathrm{.}6($to use the chart$)$

b$.$ The equivalent volume diameter of the particle

Ans: $2\mathrm{.}12{10}^{-4}m$

C$.$ The terminal velocity of particle falling through water at $30C$

Ans $0\mathrm{.}0019\frac{m}{s}($density difference is very small$)$

A quantity of solid particles in $(2)$ is mixed with water at $30C$ to form a slurry of $30wt\%$ solids.

Determine the settling $($or terminal$)$ velocity of the solids in the slurry.

Compare your answer for $(3)$ and $2($c$).$

Ans: $=0\mathrm{.}747,{}_m=1052k\frac{g}{m}3,v_t=0\mathrm{.}00088\frac{m}{s}$