Air JetsReferring again to Fig.B.8, the gas flow exiting the acoustic tube is shown as forming a jet. The jet ``carries its own pressure'' until it dissipates in some form, such as any combination of the following:
- heat (now allowing for ``friction'' in the flow),
- vortices (angular momentum),
- radiation (sound waves), or
- pressure recovery.
For a summary of more advanced aeroacoustics, including consideration of vortices, see . In addition, basic textbooks on fluid mechanics are relevant .