Thermodynamics HW Solutions 838

Thermodynamics HW Solutions 838 - g=9.8...

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Chapter 10 Boiling and Condensation 10-55 "!PROBLEM 10-55" "GIVEN" "P_sat=4.25 [kPa], parameter to be varied" n_tube=100 N=10 L=8 "[m]" D=0.03 "[m]" T_s=20 "[C]" "PROPERTIES" Fluid$='steam_NBS' T_sat=temperature(Fluid$, P=P_sat, x=1) T_f=1/2*(T_sat+T_s) h_f=enthalpy(Fluid$, T=T_sat, x=0) h_g=enthalpy(Fluid$, T=T_sat, x=1) h_fg=(h_g-h_f)*Convert(kJ/kg, J/kg) rho_v=density(Fluid$, T=T_sat, x=1) rho_l=density(Fluid$, T=T_f, x=0) mu_l=Viscosity(Fluid$,T=T_f, x=0) nu_l=mu_l/rho_l C_l=CP(Fluid$, T=T_f, x=0)*Convert(kJ/kg-C, J/kg-C) k_l=Conductivity(Fluid$, T=T_f, P=P_sat+1)
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Unformatted text preview: g=9.8 "[m/s^2], gravitational acceleraton" "ANALYSIS" "(a)" h_fg_star=h_fg+0.68*C_l*(T_sat-T_s) h_1tube=0.729*((g*rho_l*(rho_l-rho_v)*h_fg_star*k_l^3)/(mu_l*(T_sat-T_s)*D))^0.25 h=1/N^0.25*h_1tube Q_dot=h*A*(T_sat-T_s) A=n_tube*pi*D*L "(b)" m_dot_cond=Q_dot/h_fg_star P sat [kPa] Q [W] m cond [kg/s] 3 1836032 0.7478 4 3376191 1.374 5 4497504 1.829 6 5399116 2.194 7 6160091 2.502 8 6814744 2.766 9 7402573 3.004 10 7932545 3.218 11 8415994 3.413 12 8861173 3.592 13 9274152 3.758 14 9659732 3.914 15 10021650 4.059 10-50...
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