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clear;
clc;
printf("\n Example 10.9\n");
//The proces is defined by
// Ca = B1*exp(sqrt((k/D)y)) + B2*exp(-sqrt((k/D)y))
//Boundary conditions as
// Ca=Cai at y=0
// Ca=Cai/2 at y=l
//Using above 3 equations, final equation is derived as follows
//Assuming
// ratio = (Na)y=l / (Na)y=0
// z=l*sqrt(k/D)
z=0.693;
ratio=(exp(sqrt(z))+exp(-sqrt(z))-4)/(2*(1-exp(-sqrt(z))-exp(sqrt(z))));
printf("\n The final ratio is %.2f \n",ratio);
//End
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