similar in speed to an eductive fiber draw unit jet stream produces very good energy transfer from quench fluid velocity to fiber speed for several reasons the air jet formed at the impingement point is transferring energy only to fibers like a non eductive system and not wasting energy entraining air from atmosphere to create the low pressure suction at the top of an eductive drawing device the fibers are exposed to the air jet formed inside the impingement point which means that the fibers see the peak velocity of the stream in eductive systems the fibers enter the stream in the fiber draw unit after the jet achieves peak velocity after it mixes with atmosphere and entrained air so that that the resultant energy transfer directly to the fibers is lower when a stream of fluid is directed through an air knife slot to atmosphere it immediately loses its pressure as it expands to atmosphere energy of the quench fluid mass is transformed from pressure to velocity the stream begins to u201c opens up u201d or widen from the original slot width as the pressurized compressible gas expands which in turn begins to slow the stream velocity if one adds fibers at this point the mix of expanding fluid and independent flexible fibers creates a highly turbulent mixing zone just below the exit which tremendously aids the transferring of quench fluid energy mass u00d7 velocity to fiber velocity this also acts to slow down the.