Based on Euler-Lagrange method

the characteristic of LN2 (liquid nitrogen) atomized by the Y-jet nozzle was studied by discrete phase model and air blast atomizer model of software FLUENT. Because of the evaporation effect of LN2 droplets

the spray angle was about 10°

significant smaller than the spray angle of water

and the spray distance was shortened. The effect of operating pressure on the Sauter mean diameter (SMD) and the distribution of volume fraction and quantity percentage was analyzed. The results indicate that the SMD along the spray direction is essentially unchanged. The SMD is controlled by gas velocity and gas-liquid ratio

and gas velocity is the major factor in the low pressure conditions while gas-liquid ratio is the major factor in the high pressure conditions. The distribution of LN2 droplets diameter is more concentrated than in the cases using water

due to the evaporation of droplets. The effect of temperature control of LN2-spray temperature-adjusting system using Y-jet nozzles with different flow rate demands was also investigated. The temperature of outlet was lower than 98K with temperature difference of 12K between inlet and outlet

and the temperature difference of outlet was within ±1K

which could satisfy the temperature control requirements.