Convection heat transfer for cylinder(Cont'd) Generally want the overall average Nusselt number for heat transfer with the entire object. As with a flat plate,correlations developed from experimental data to compute Nu as a f(Rem,Prm) Overall Average Nusselt number hD 1/4 Pr Nup k CRe PrV/3 二( Prs 「0.7<Pr<500 Valid for: 1<Rep <106 All properties are evaluated at the freestream temperature,except Prs which is evaluated at the surface temperature. #9 Heat Transfer Su Yongkang School of Mechanical EngineeringHeat Transfer Su Yongkang School of Mechanical Engineering # 9 Convection heat transfer for cylinder (Cont’d) • Generally want the overall average Nusselt number for heat transfer with the entire object. • As with a flat plate, correlations developed from experimental data to compute Nu as a f(Rem ,Pr n) Overall Average Nusselt number • All properties are evaluated at the freestream temperature, except Prs which is evaluated at the surface temperature.                   6 1 4 1 3 1 Re 10 0.7 Pr 500 Valid for : Pr Pr Re Pr D s m D C D k hD Nu