Convection correlations: laminar flow in circular tubes 1. The fully developed region from the energy equation, we can obtain the exact solution for constant surface heat flux hD 4.36 k for constant surface temperature hD 3.66T=C k Note: the thermal conductivity k should be evaluated at T' Heat Transfer Su Yongkang School of Mechanical EngineeringHeat Transfer Su Yongkang School of Mechanical Engineering # 4 Convection correlations: laminar flow in circular tubes • 1. The fully developed region from the energy equation,we can obtain the exact solution. for constant surface heat flux for constant surface temperature Note: the thermal conductivity k should be evaluated at .  = 4.36 k hD NuD q  s  = C  = 3.66 k hD NuD Ts = C Tm