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authorprashantsinalkar2017-10-10 12:27:19 +0530
committerprashantsinalkar2017-10-10 12:27:19 +0530
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+clear;
+clc;
+printf('FUNDAMENTALS OF HEAT AND MASS TRANSFER \n Incropera / Dewitt / Bergman / Lavine \n EXAMPLE 10.2 Page 635 \n'); //Example 10.2
+// Power Dissipation per unith length for the cylinder, qs
+
+//Operating Conditions
+Ts = 255+273 ;//[K] Surface Temperature
+Tsat = 100+273 ;//[K] Saturated Temperature
+D = 6*10^-3 ;//[m] Diameter of pan
+e = 1 ;// eimssivity
+stfncnstt=5.67*10^(-8) ;// [W/m^2.K^4] - Stefan Boltzmann Constant
+g = 9.81 ;//[m^2/s] gravitaional constant
+//Table A.6 Saturated water Liquid Properties T = 373 K
+rhol = 957.9 ;//[kg/m^3] Density
+hfg = 2257*10^3 ;//[J/kg] Specific Heat
+//Table A.4 Water Vapor Properties T = 450 K
+rhov = .4902 ;//[kg/m^3] Density
+cpv = 1.98*10^3 ;//[J/kg.K] Specific Heat
+kv = 0.0299 ;//[W/m.K] Conductivity
+uv = 15.25*10^-6 ;//[N.s/m^2] Viscosity
+
+Te = Ts-Tsat;
+
+hconv = .62*[kv^3*rhov*(rhol-rhov)*g*(hfg+.8*cpv*Te)/(uv*D*Te)]^.25;
+hrad = e*stfncnstt*(Ts^4-Tsat^4)/(Ts-Tsat);
+
+//From eqn 10.9 h^(4/3) = hconv^(4/3) + hrad*h^(1/3)
+//Newton Raphson
+h=250; //Initial Assumption
+while(1>0)
+f = h^(4/3) - [hconv^(4/3) + hrad*h^(1/3)];
+fd = (4/3)*h^(1/3) - [(1/3)*hrad*h^(-2/3)];
+hn=h-f/fd;
+if((hn^(4/3) - [hconv^(4/3) + hrad*hn^(1/3)])<=.01)
+ break;
+end;
+h=hn;
+end
+
+q = h*%pi*D*Te;
+
+printf("\n Power Dissipation per unith length for the cylinder, qs= %i W/m",q);
+//END \ No newline at end of file