Abstract
Aiming to develop evaluation methods for estimating deposition distributions of sea salt particles on a surface in a steel pipe, we have performed numerical simulations for air flow approaching the inside of a pipe. The special attention was paid to the behavior of shear stress predicted by a turbulence model, which corresponds to the deposition of sea-salt particles with small diameters. First, a benchmark test among two-low Re type turbulence models, Launder-Sharma and Kato-Launder models, used in engineering applications was carried out; the Kato-Launder model, which has an advantage for prediction of turbulence kinetic energy near structures, has a capability to capture transition of the boundary layer from laminar to turbulence and also separation flows at the edge of the pipe; the advantage is vital for reproduction of axial distributions of wall shear stress, which shows rapid increases and decreases of entrance regions. The simulations with Kato-Launder model under various wind conditions show that the large values of shear stress only appear at the entrance region, which corresponds to observations for distributions of corrosion rate and deposited sea salt inside a steel pipe.
