Can the output of a Vortex Tube be connected to an Air Knife or Air Amplifier?

No, for the Vortex Tube to operate properly, the cold outlet should not be subjected to any restrictions that would produce back pressure in excess of 0.3 BAR (5 PSIG). Depending on the cold fraction, the hot end exhaust can withstand pressure up to 2.07 BAR (30 PSIG). The performance of the Vortex Tube will deteriorate if backpressure exceeds 0.3 BAR (5 PSIG).

An Air Knife or Air Amplifier would restrict the flow of a Vortex Tube to the point where the back pressure is excessive causing the cooling capacity of the Vortex Tube to be severely limited.

It would be unrealistic to expect a temperature decrease in the total output flow of either an Air Amplifier or Air Knife with chilled compressed air. Compressed air makes up only a small fraction of the total airflow output from these devices. The net temperature out will be a mix of compressed and ambient air, with the ambient air comprising most of the volume. Therefore, the airflow is going to be the same or very close to the ambient temperature surrounding an Air Knife or Air Amplifier.

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