The impingement technique involves a high-velocity air jet that strikes against the product surface to disrupt boundary layer of air surrounding the object and, as a consequence, substantially increases the heat transfer rate between the cooled product and its surroundings. Therefore, the rate of chilling the product in the air jet impingement system is higher compared to the forced convection method. Characterizing the air jet flow at the single nozzle exit, the following three impingement flow regions may be enumerated: free jet flow, stagnation and horizontal flow or wall jet.