Abstract
The solidification process of solid-air is a significant risk in liquid hydrogen system. To predict the solidification of air in liquid hydrogen, the coupled model of Lattice Boltzmann Method (LBM) and Cellular Automation (CA) has been proposed. Results shows that the local oxygen mass ratio can reach up to 30% at 0.1s when the air-proportioned nitrogen and oxygen mixture is solidified. The LBM-CA method is further used to study the effects of forced convection on the solid-air dendrite. It is shown that the upstream latent heat and the rejected solutes accumulate in the downstream with the flow field, leading to higher oxygen concentration in the downstream as the flow velocity increases. In addition, the solid-phase fraction of solid-air increases faster with the increasing flow velocity which indicates an increasing safety risk for the liquid hydrogen with solid-air system.
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