Mixing
The high air velocity rate in the air jet will generate excess pressure, resulting in an inflow and entrainment of room air towards the air jet supplied.
During the first air flow cycle the air velocity will be high, but as the quantity of room air that becomes mixed increases, the air velocity will decrease.
If the system has been dimensioned properly the delivered air volume will be completely mixed with the room air before it reaches the occupied zone and the air velocity rate has dropped to the desired level, depending on the room category.
In a mixing ventilated room air velocity, air temperatures and humidity will be distributed identically and in theory the air quality will be the same everywhere in the room.