diff options
Diffstat (limited to '2510/CH12/EX12.5/Ex12_5.sce')
-rwxr-xr-x | 2510/CH12/EX12.5/Ex12_5.sce | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/2510/CH12/EX12.5/Ex12_5.sce b/2510/CH12/EX12.5/Ex12_5.sce new file mode 100755 index 000000000..b35245a04 --- /dev/null +++ b/2510/CH12/EX12.5/Ex12_5.sce @@ -0,0 +1,39 @@ +//Variable declaration: +T1 = 99.0 //Mean film temperature (°C) +T2 = 98.0 //Plate surface temperature (°C) +g = 9.807 //Gravitational acceleration (m/s^2) +//From Appendix: +T3 = 100.0 //Saturation temperatre (°C) +h_vap1 = 970.3 //Latent heat of steam in Btu/lb (Btu/lb) +h_vap2 = 2.255*10**6 //Latent heat of steam in J/kg (J/kg) +p_v = 0.577 //Density of steam (kg/m^3) +p_l = 960.0 //Density of liquid water condensate (kg/m^3) +mu_l = 2.82*10**-4 //Absolute viscosity of liquid water condensate (kg/m.s) +k = 0.68 //Thermal conductivity of water (W/m.K) +//From table 12.2 +Z = 0.4 //Height of rectangular plate (m) +Pw = 0.2 //Wetted perimeter of rectangular plate (m) +syms h //Average heat transfer coefficient (W/m^2.K) + +//Calculation: +A = Z*Pw //Heat transfer area of plate (m^2) +R = A/Pw //Ratio A/Pw (m) +v_l = mu_l/p_l //Kinematic viscosity of liquid water condensate (m^2/s) +Co1 = (h/k)*(v_l**2/g/(1-p_v/p_l))**(1/3) //Condensation number (in terms of the average heat transfer coefficient) +Re = 4*h*Z*(T3-T2)/(mu_l*h_vap2) //Reynolds number in terms of the average heat transfer coefficient +//From equation 12.14: +CO1 = 0.0077*Re**Z //Co in terms of Reynolds number for flow type 1 +x1 = solve(h,Co1-CO1) //Solving heat transfer coefficient (W/m^2.K) +h1 =x1(2); //Average heat transfer coefficient for flow type 1 (W/m^2.K) +Re1 = subst(h1,h,Re) //Reynolds number for flow type 1 +CO2 = 1.874*Re**(-1/3) //Co in terms of Reynolds number for flow tupe 2 +x2 = solve(Co1-CO2,h) //Solving average heat transfer coefficient for flow type 2 (W/m^2.K) +h2 = x2(1); //Average heat transfer coefficient for flow type 2 (W/m^2.K) +Re2 = subst(h2,h,Re) //Reynolds number for flow type 2 +h2 = round(h2*10**-1)/10**-1 + +//Result: +printf("The type of condensation flow type 2 is laminar.") +disp("And the condensation heat transfer coefficient is : ") +disp(h2) +disp("W/m^2.K.") |