This work presents an experimental and numerical study on the dispersal characteristics of a liquid jet ejecting into vacuum. The liquid breaking is mainly caused by flash evaporation and bubbles expansion. Experiments of liquid dispersing under different conditions show that the superheat degree is the most important parameter influencing the pattern of the breaking liquid. The jet velocity has large influence on the distribution of the particle sizes. Mixing some volatile liquid with nonvolatile liquid can enhance the dispersion of the latter. The Lattice Boltzmann Method is applied to simulate the breakup process of liquid diglycol and the simulations have good agreement with the experimental results.

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