Chilldown process is a complicated process involves unsteady
two-phase heat and mass transfer and initiates the cryogenic fluids
transport. To advance the understanding of this process, both
experimental and modeling investigations have been carried. The
chilldown process can be generally divided into three regions which
are associated with different flow regimes and heat transfer
mechanisms. Under low flow conditions, the two-phase flow during
chilldown is dispersed. The statistic feature of the liquid
filaments is studied and a model, in which the heat transfer at the
bottom is considered as a sum of vapor and liquid components, has
been developed for the dispersed flow film boiling. The bottom wall
heat flux is found to decrease under microgravity condition. A
cryogenic chilldown model has also been developed. The model
focuses on both vertical tube orientation and microgravity
chilldown and shows a good agreement with previous experimental
data.
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