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# newihtcode (Autosaved) - /Conduction Through Touch Screen...

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//Conduction Through Touch Screen /* qts=(k* ((Tf-Ts)/ L)) k=1.4 Ts=60 +273 L=.003 qts=30 */ /* Solving for the temperature of touch screen, it is approximately 60.1 C */ /*Internal Flow; Forced Convection*/ /* //Energy balance equations qconv=mdot*cp* (Tout-Tin) //cp=specific heat mdot=rho*um ReD1 = v * Dh / nu NuDbar1 = 0.023*ReD1^(4/5)*Pr1^n // Eq 8.60 NuDbar1=(h*L)/k delta=0.37*xt*ReD1^(-1/5) //Values and Properties Pr1= Pr_T("Air",Tf1) // Prandtl number rho = rho_T("Air",Tf1) // Density, kg/m^3 cp = cp_T("Air",Tf1) // Specific heat, J/kg·K nu = nu_T("Air",Tf1) // Kinematic viscosity, m^2/s Tin=40 +273 // Given ambient air Tout= 60.1 +273 // Assume an average temperature between surface (120C) and safe to // touch temp (60C) Tf1= (Tin +Tout)/2 // Temp Dh=(4*Ac)/P //Hyraulic diameter xh= 0.05*Dh*ReD1 //used to determine hydrodynamic entrance length (equation for laminar, but must prove turbulent) xt=xh*Pr1 //used to determine thermal entrance length (equation for laminar, but must prove

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## This note was uploaded on 09/26/2011 for the course ME 058 taught by Professor Prof. during the Spring '11 term at Illinois Central.

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newihtcode (Autosaved) - /Conduction Through Touch Screen...

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