Abstract
Turbulent mass transfer, which is one of the key factors on the evaluation of flow accelerated corrosion (FAC), was considered using the analogy with the turbulent heat transfer. The mass transfer in the straight pipe is suggested to be proportional to the wall friction factor as well as the turbulence energy. We proposed the effective friction velocity taking the turbulent velocity near wall surface into account, which is used to evaluate the mass transfer at the turbulent region such as elbow and the downstream of orifice. STAR-CCM+ code with realizable k-ε two-layer model is used to evaluate the mass transfer at the turbulent region, in which wall function is not used and lattice points are taken in the viscous sublayer to evaluate mass transfer near wall surface of turbulent region. By introducing a concept of "Threshold Mass Transfer Coefficient", geometry factor correlations were evaluated for elbow, orifice, T-union and separation, quantitatively.
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