Example: Heated Wire At a rayleigh of Compute Nusselt# and convection coefficient TD hD CRap k Rate of heat transfer to air is q=hD(Ts-Too) W/m of length Heat Transfer Su Yongkang School of Mechanical EngineeringHeat Transfer Su Yongkang School of Mechanical Engineering # 9 Example: Heated Wire • At a Rayleigh # of : C = , n= Compute Nusselt # and convection coefficient Rate of heat transfer to air is: q = hD(Ts -T ) W/m of length ( )   3 g T T D Ra s D −  = n D CRaD k hD Nu = =