A two-phase flow model for wet gas predicted by CFD is researched. This simulation aims at dual differential-pressure long-throat Venturi flow sensor. Simulation pressure ranges of 0. 4

1. 2 MPa

gas phase volume flow range of 140 m3/ h

283 m3/ h

temperature range of 23

30 ℃

liquid of volume fraction is range of0. 5

1. 5 %. The diameter of Venturi flow meter is 100 mm and throttle ratio is 0. 55. The multiphase flow model uses discrete phase model（ DPM）

Eulerian wall film（ EWF） model is used to simulate thin liquid film on pipe wall. Influence rule of pressure / gas phase flow velocity and liquid volume fraction（ LV

F） on liquid film thickness can be found from analysis. Gas liquid flow prediction model are set up based on dual differential pressures ratio method according to simulation result. Compare simulation value and experimental value

it shows that root mean square error（ RMSE） of gas flow model prediction is 1. 8 %

and RMSE of liquid phase flow model prediction is6. 1 %.