The computational fluid software was used to simulate the flow field at downstream of the orifice plate in power plants

and the influence of velocity and aperture ratio on flow field distribution and mass transfer coefficient at downstream of the orifice plate was studied. Based on the established flow-accelerated corrosion(FAC) model

the correlation between the corrosion behavior at downstream of the orifice plate and the velocity and aperture ratio was determined. The results show that

when the aperture ratio is constant

the mass transfer coefficient and the corrosion rate of the orifice plate increase with the velocity

and the position of the maximum corrosion rate shifts to downstream of the orifice plate. When the velocity of the fluid is constant

the smaller the pore diameter ratio is

the greater the mass transfer coefficient and the corrosion rate are

and the high-incidence area of corrosion moves toward the orifice plate. The results obtained by this model agree well with the experimental results.