(2)过渡区或艾仑(Al1en)定律区: 1<Re,<103 18.5 d(P,-P)8Re Re6 =0.27 (3) 湍流区或牛顿(Nuwton)定律区: 103<Re,<2×105 5=0.44 4,=1.74 d(ps-p)g p 9/5/20249/5/2024 18 (2)过渡区或艾仑(Allen)定律区: ( ) 0.6 0.6 3 0.27 Re Re 18.5 1 Re 10 t s t t t d g u − = = (3)湍流区或牛顿(Nuwton)定律区: ( ) d g u s t t − = = 0.44 1.74 10 Re 2 10 3 5