Thermodynamics HW Solutions 708

Thermodynamics HW Solutions 708 - Nusselt_a=0.59*Ra_a^0.25

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Chapter 9 Natural Convection 9-20E "!PROBLEM 9-20E" "GIVEN" L=2 "[ft]" T_infinity=75 "[F]" "T_s=130 [F], parameter to be varied" "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 beta=1/(T_film+460) T_film=1/2*(T_s+T_infinity) g=32.2 "[ft/s^2], gravitational acceleration" "ANALYSIS" "(a), plate is vertical" delta_a=L Ra_a=(g*beta*(T_s-T_infinity)*delta_a^3)/nu^2*Pr
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Unformatted text preview: Nusselt_a=0.59*Ra_a^0.25 h_a=k/delta_a*Nusselt_a A=L^2 Q_dot_a=h_a*A*(T_s-T_infinity) "(b), plate is horizontal with hot surface facing up" delta_b=A/p p=4*L Ra_b=(g*beta*(T_s-T_infinity)*delta_b^3)/nu^2*Pr Nusselt_b=0.54*Ra_b^0.25 h_b=k/delta_b*Nusselt_b Q_dot_b=h_b*A*(T_s-T_infinity) "(c), plate is horizontal with hot surface facing down" delta_c=delta_b Ra_c=Ra_b Nusselt_c=0.27*Ra_c^0.25 h_c=k/delta_c*Nusselt_c Q_dot_c=h_c*A*(T_s-T_infinity) 9-9...
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This note was uploaded on 01/24/2012 for the course PHY 4803 taught by Professor Dr.danielarenas during the Fall '10 term at UNF.

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