解得:d=0.074m,u=1.933m/s Re C0.074×1.933×1000 =143035 1.0×10 E0.2×10 =0.0027 d0.074 查图得:=0.027与初设值不同,用此λ值重新计算 0.0106 2 70 2 4.5=0.027×— 2 解得:d=0075m=184m/s 2021/2/21 上页下页2021/2/21 解得:d=0.074m,u=1.933m/s du Re = 143035 1.0 10 0.074 1.933 1000 3 = = − 0.0027 0.074 0.2 10 3 = = − d 查图得: = 0.027 与初设值不同,用此λ值重新计算 g d d 2 ) 0.0106 ( 70 4.5 0.027 2 2 = 解得: d = 0.075m u =1.884m/s