External Convection Flow For flow over cylinder Overall Average nusselt number hD NuD k CRe 2P+13/P)4 Pr Table 7.2 has constants C and m as f(Re For flow over sphere hD Nu D =2+(04Re k D+0.068D少104/4) μ For falling liquid drop Nun=2+0. re pr Heat Transfer Su Yongkang School of Mechanical EngineeringHeat Transfer Su Yongkang School of Mechanical Engineering # 6 External Convection Flow For flow over cylinder Overall Average Nusselt number Table 7.2 has constants C and m as f(Re) For flow over sphere For falling liquid drop 1 4 1 3 Pr Pr Re Pr         = = s m D D C k hD Nu 1 4 1 2 2 3 0.4 2 (0.4 Re 0.06 Re )Pr           = = + + s D D D k hD Nu 1 2 1 3 2 0.6 Re Pr NuD = + D