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+//Exa 4.9

+clc;

+clear;

+close;

+//given data

+rho=8500;// in kg/m^3

+C=400;// J/kgK

+toh=1;// in sec

+h= 400;// in W/m^2 degree C

+t=198;// in degree C

+t_i=25;// in degree C

+t_infinite=200;// in degree C

+

+// Part (1)

+// toh =rho*V*C/(h*A) = rho*C*l_s/h

+l_s= toh*h/(rho*C);

+// l_s = V/A = r/3 

+r=3*l_s;// in m

+r=r*10^3;// in mm

+d=2*r;// in m

+disp(d,"Junction diameter needed for the thermocouple in mili miter");

+

+// Part(ii)

+// toh= -rho*V*C/(h*A)*log((t-t_infinite)/(t_i-t_infinite))  

+toh = -toh*log((t-t_infinite)/(t_i-t_infinite));

+disp(toh,"Time required for the thermocouple junction to reach 198 degree C in seconds");