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+//Kunii D., Levenspiel O., 1991. Fluidization Engineering(II Edition). Butterworth-Heinemann, MA, pp 491

+

+//Chapter-14, Example 4, Page 352

+//Title: Wide Size Distribution of Shrinking Particle

+//==========================================================================================================

+

+clear

+clc

+

+//INPUT

+dpi=[1.05;0.95;0.85;0.75;0.65;0.55;0.45;0.35;0.25;0.15;0.05];//Mean size in mm

+Fo=[0;0.5;3.5;8.8;13.5;17.0;18.2;17.0;13.5;7.3;0]*10^-2;//Feed rate in kg/s

+k=[0;0;0;0;0;0;0;0;2.0;12.5;62.5]*10^-5;//Elutriation constant in s^-1

+R=-1.58*10^-5;//Rate of particle shrinkage in mm/s

+deldpi=0.1;//Size intervals in mm

+

+//CALCULATION

+n=length(dpi);

+m=2;//Starting with the largest value size interval that contains solids

+W(m-1)=0;

+while m<=n

+    W(m)=(Fo(m)-R*W(m-1)/deldpi)/(k(m)-R/deldpi-3*R/dpi(m));//From Eqn.(33)

+    m=m+1;

+end

+Wt=sum(W);//Total sum

+

+//OUTPUT

+printf('\nTotal mass in the bed:%fkg',Wt);

+

+//====================================END OF PROGRAM ======================================================
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