Thermodynamics HW Solutions 570

Thermodynamics HW Solutions 570 - h=k/D*Nusselt A=pi*D*L

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Chapter 7 External Forced Convection 7-43E "!PROBLEM 7-43E" "GIVEN" T_infinity=54 "[F], parameter to be varied" "Vel=20 [mph], parameter to be varied" T_s=86 "[F]" L=2 "[ft]" D=3/12 "[ft]" "PROPERTIES" Fluid$='air' k=Conductivity(Fluid$, T=T_film) Pr=Prandtl(Fluid$, T=T_film) rho=Density(Fluid$, T=T_film, P=14.7) mu=Viscosity(Fluid$, T=T_film)*Convert(lbm/ft-h, lbm/ft-s) nu=mu/rho T_film=1/2*(T_s+T_infinity) "ANALYSIS" Re=(Vel*Convert(mph, ft/s)*D)/nu Nusselt=0.3+(0.62*Re^0.5*Pr^(1/3))/(1+(0.4/Pr)^(2/3))^0.25*(1+(Re/282000)^(5/8))^(4/5)
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Unformatted text preview: h=k/D*Nusselt A=pi*D*L Q_dot_conv=h*A*(T_s-T_infinity) T [F] Q conv [Btu/h] 20 790.2 25 729.4 30 668.7 35 608.2 40 547.9 45 487.7 50 427.7 55 367.9 60 308.2 65 248.6 70 189.2 75 129.9 80 70.77 Vel [mph] Q conv [Btu/h] 10 250.6 12 278.9 14 305.7 16 331.3 18 356 20 379.8 22 403 24 425.6 26 447.7 28 469.3 30 490.5 32 511.4 34 532 36 552.2 38 572.2 40 591.9 7-25...
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This note was uploaded on 01/22/2012 for the course PHY 4803 taught by Professor Dr.danielarenas during the Fall '10 term at UNF.

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