Based on the computational fluid dynamics (CFD) method

the effect of the magnitude of typical 5 m diameter tank short-shell insulated area (non adiabatic

50% adiabatic and 100% adiabatic) on the evaporation characteristics of liquid hydrogen tank was studied. The volume of fluid (VOF) model was used to calculate the two-phase flow with the Lee model for calculations of the mass transfer rate in the gas-liquid interface. The heat transfer boundary conditions due to possible frosting on the foam surface and the bare metal surface were considered. The numerical model and the interface mass transfer calculation had clear gas-liquid interface

and helped to accurately capture the change of liquid hydrogen level. The numerical results showed that short-shell was the main factor of heat leakage in liquid hydrogen tank and played an important role in the effect of liquid hydrogen evaporation rate. The average temperature of the gas phase decreased from 110 K in 0 case to 32 K in 50% case

while it only decreased to 23 K when the adiabatic area continued to increase to 100%

and the improvement effect of the adiabatic area was relatively reduced. Compared with the effect of the increase of the adiabatic proportion of short shell from 50% to 100% and from 0 to 50% on the relative evaporation rate

the difference of the former was small

only 24%

while the difference of the latter was obvious

with a decrease of 409%. The research results provide a guide to the optimization design of the thermal insulation structure of the liquid hydrogen storage tank.