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+//clear//

+clear;

+clc;

+

+//Example 22.2

+//Given

+Dp = 1; //[in.]

+vdot = 25000; //[ft^3/h]

+T = 68; //[F]

+P = 1; //[atm]

+ya = 0.02;

+Mair = 29;

+Mg = 17;

+//Solution

+//The average molecular weiht of the entering gas 

+M = (1-ya)*Mair+ya*Mg;

+rho_y = M*492/(359*(460+68)); //[lb/ft^3]

+rho_x = 62.3; //[lb/ft^3]

+//(a)

+//Using Fig.(22.8), from Example 22.1 A = Gx/Gy = 1 and

+//Let 

+A = 1;

+B = A*sqrt(rho_y/rho_x);

+//Form Fig 22.8, the superficial vapor velocity at flooding

+//is uof*sqrt(rho_y/(rho_x-rho_y))=0.11, therefore

+uof = 0.11/sqrt(rho_y/(rho_x-rho_y)); //[m/s]

+//The allowable vapor velocity

+uo = uof*0.5; //[m/s]

+uo = uo*3.28; //[ft/s]

+//the corresponding mass velocity

+Gy = uo*rho_y; //[lb/ft^2-s]

+//The allowable mass velocity in the example was 0.236 lb/ft^2-s.

+//The increase by using structured packing is

+increase = (Gy/0.236)-1;

+disp(increase*100,'The percent increase in mass velocity is');

+

+//(b)

+//The pressure drop

+delta_P = 20*1.22*(0.5/0.9)^1.8; //[in. H2O]

+//This is 1.2 times the pressure drop of 7 in.H2O in the Intolax saddles.

+disp('The pressure drop will be greater than Intolax Saddles')