Production of ceramic coatings by plasma spraying on thermally sensitive substrates requires a hard cooling onto the substrate immediately after the plasma and particles jet getting-through. That implies a cryogenic cooling spray. In order to have a better understanding of thermal transfer between cryogenic droplets and substrate, we simulate with a home-made software, PARTIX, the transport of pulverized jet in the atmosphere and calculate the droplet size distributions impacting the substrate. Knowing that, we can determine the thermal flux. Simulations of different pulverized flows are presented.