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+

+//exapple 11.4 

+clc; funcprot(0);

+// Initialization of Variable

+U=2.032/10^4;

+pi=3.1428;

+rho=852;

+g=9.81;

+mu=1.92/1000;

+mf=125/3600;//mass flow rate

+//calculation

+//part 1

+G=U*rho;

+A=mf/G;

+d=sqrt(4*A/pi);

+disp(d, "the diameter of vessel will be in(m):");

+//part 2

+A=0.201;

+e=0.43;

+ms=102;//mass of solids

+rhos=1500;//density of solid

+L=ms/rhos/A;

+Lmf=L/(1-e);

+disp(Lmf , "depth of bed in (m):")

+//part 3

+d1=0.2/1000;

+U=2*5.5/10^3*e^3*d1^2*(rhos-rho)*g/mu/(1-e);

+//now euating for e

+//a=e^3/(1-e)

+a=U/5.5*10^3/(d1^2*(rhos-rho)*g/mu);

+y=poly([-a a 0 1],'e',"coeff");

+e2=roots(y);

+L=Lmf*(1-e)/(1-e2(3));

+disp(L,"depth of fluidised bed under operating condition in (m):")