我只计算出了, Total Volume: VT = A x L = π (id/2)2 . L = 23.56 cm3 VM = 0.002* VT = 0.047 cm3 F= VM/tM = 0.047/0.0017 = 27.65 mL/min v = L/tM = 3000/(0.0017*60) = 29411.76 cm/s H = A + B/v + C.v = A + 0.073/v + 0.00023*v= 6.9 cm A = 0.14 cm Average N=L/H=3000/6.9=434.78 cm