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| author | priyanka | 2015-06-24 15:03:17 +0530 |
|---|---|---|
| committer | priyanka | 2015-06-24 15:03:17 +0530 |
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| tree | ab291cffc65280e58ac82470ba63fbcca7805165 /497/CH11/EX11.1/Chap11_Ex1.sce | |
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diff --git a/497/CH11/EX11.1/Chap11_Ex1.sce b/497/CH11/EX11.1/Chap11_Ex1.sce new file mode 100755 index 000000000..56754f278 --- /dev/null +++ b/497/CH11/EX11.1/Chap11_Ex1.sce @@ -0,0 +1,56 @@ +//Kunii D., Levenspiel O., 1991. Fluidization Engineering(II Edition). Butterworth-Heinemann, MA, pp 491
+
+//Chapter-11, Example 1, Page 265
+//Title: Fitting Reported Mass Transfer Data with the Bubbling Bed Model
+//==========================================================================================================
+
+clear
+clc
+
+//INPUT
+db=0.37;//Equilibrium bubble size in cm
+dp=0.028;//Particle size in cm
+rhos=1.06;//Density of solids in g/cc
+ephsilonmf=0.5;//Void fraction at minimum fluidization condition
+phis=0.4;//Sphericity of solids
+gammab=0.005;//Ratio of volume of dispersed solids to that of bubble phase
+rhog=1.18E-3;//Density of air in g/cc
+myu=1.8E-4;//Viscosity of gas in g/cm s
+D=0.065;//Diffusion coefficient of gas in cm^2/s
+Sc=2.35;//Schmidt number
+etad=1;//Adsorption efficiency factor
+y=1;
+umf=1.21;//Velocity at minimum fluidization condition in cm/s
+ut=69;//Terminal velocity in cm/s
+g=980;//Acceleration due to gravity in square cm/s^2
+uo=[10;20;30;40;50];//Superficial gas velocity in cm/s
+
+//CALCULATION
+n=length(uo);
+i=1;
+Rept=(dp*ut*rhog)/myu;
+Shstar=2+(0.6*(Rept^0.5)*(Sc^(1/3)));//Sherwood no. from Eqn.(1)
+Kbc=4.5*(umf/db)+5.85*((D^0.5*g^0.25)/db^(5/4));//Gas interchange coefficient between bubble and cloud from Eqn.(10.27)
+ubr=0.711*(g*db)^0.5;//Rise velocity of the bubble
+while i<=n
+ x(i)=(uo(i)-umf)/(ubr*(1-ephsilonmf));//The term delta/(1-epshilonf) after simplification
+ Shbed(i)=x(i)*[(gammab*Shstar*etad)+((phis*dp^2*y)/(6*D))*Kbc];//Sherwood no. from Eqn.(11)
+ Rep(i)=(dp*uo(i)*rhog)/myu;//Reynolds of the particle
+ i=i+1;
+end
+
+//OUTPUT
+printf('\nThe desired result is the relationship between Shbed and Rep The points gives a straight line of the form y=mx+c');
+printf('\nRep');
+printf('\t\tShbed');
+i=1;
+while i<=n
+ printf('\n%f',Rep(i));
+ printf('\t%f',Shbed(i));
+ i=i+1;
+end
+plot(Rep,Shbed);
+xlabel("Rep");
+ylabel("Shbed");
+
+//====================================END OF PROGRAM ======================================================
\ No newline at end of file |