MIXING ZONE OF A PLANAR JET AND FLUCTUATIONS INDUCED IN A POTENTIAL CORE WITH INTERMITTENCY

In this paper the mixing region and the potential core of a two-dimensional jet have been investigated. The velocity fluctuations induced in the potential core by the random motion of both external and internal boundaries have been measured; it has thus been possible to show that such induced fluctuations cross the turbulent domain. The intermittency factor has been obtained from a conveniently processed signal. Thermal parameters have been investigated in a similar way for the same jet when it is heated. This has allowed comparisons setting out some specific aspects of both these phenomena. © 1969.