Abstract: The multicomponent gas replacement operations in the sealed capsule with cavities connected by slit are modeled and simulated based on the analytic estimation and the CFD numerical simulation methods in this paper. Corresponding result comparisons and discussions on the time costs and replacement effects of different replacement operations and parameters are presented. The estimation and numerical simulation results of mixing and compression replacement operations with different gas velocities demonstrate that, for the cavity connected by slit, analytic estimation method underestimates the effects of mixing replacement operation, but overestimates the compression replacement effects. During the mixing replacement operation, higher gas replacement efficiency is achieved with the replacing gas being pumped into the smaller cavity and the replaced gas being pumped out of the larger cavity. According to the efficiency of gas replacement operations, different gas replacement operation or their combinations should be chosen.

Key words: multicomponent, gas displacement, CFD, sealed capsule, simulation