EXPERIMENT $3-$FLUIDIZED BED $(12\mathrm{.}5$P$)$

Experimental data showing the relationship between pressure drop and flow rate in the bed for a fluidized bed are given in the graph below. The average migration velocity $(v)$ in the bed is $v=0\mathrm{.}154m/s$ at the minimum fluidization point. The cross$-$sectional area of the bed is $7\mathrm{.}45103m^2.$ The total volume of filler particles is $0\mathrm{.}0092m^3.$ Calculate the fluidized bed void fraction $($c$).$