Abstract
In recent years, with the shrinkage of the arctic sea ice area, arctic channel can be used for merchant ships. Different from the traditional channel, there are ice areas in arctic channel. Moreover, ice particles may enter into seawater cooling system of polar marines with the seawater. In the present study, Eulerian-Eulerian multiphase model coupled with the interphase heat and mass transfer model were used to investigate the solid-liquid two-phase flow and phase change characteristics of seawater slurry in the seawater pipe of shell- and-tube heat exchanger of polar ships. Firstly, the numerical models were adopted to investigate the flow and phase change characteristics of ice slurry in a straight pipe at different inlet velocities fractions. The solid phase distribution was obtained which showed that the particles concentrated on the main flow, the flow pattern was suspension, and the influence of gravity was limited with the increasing of velocity. Moreover, as a result of the collision between the particles and wall and the melting of ice particles, fewer particles were in the boundary layer region and the effect was more obvious with increasing the inlet velocity. Thereafter, the numerical models were used to investigate the flow and phase change characteristics of ice slurry in a U-pipe at the same inlet conditions. The results showed that the seawater and particles near the inner wall at the corner of pipe flowed to the outer wall because of the centrifugal force. Meanwhile, more ice particles were melt at the corner of U-pipe owing to the secondary flow caused by the bending of pipe.
Published Version
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