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//Variable declaration:
D = 0.902/12.0 //Inside diameter of tube (ft)
T_in = 60.0 //Temperature water entering the tube (°F)
T_out = 70.0 //Temperature water leaving the tube (°F)
V = 7.0 //Average wave velocity water (ft/s)
p = 62.3 //Density of water (lb/ft^3)
mu = 2.51/3600.0 //Dynamic viscosity of water (lb/ft.s)
Cp = 1.0 //Viscosity of centipoise (Btu/lb.°F)
k = 0.34 //Thermal conductivity of water (Btu/h.ft.°F)
//Calculation:
Re = D*V*p/mu //Reynolds Number
Pr = Cp*mu/k*3600 //Prandtl number
//From equation 9.26:
Nu = 0.023*(Re**0.8)*(Pr**0.4) //Nusselt number
h = (k/D)*Nu //Average film heat transfer coefficient (Btu/h.ft^2.°F)
//Result:
printf("The required average film heat transfer coefficient is : %.0f Btu/h.ft^2.°F.",h)
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