Free turbulent flow emanating from a large plane square nozzle: A theoretical and experimental study

Regarding the use of the velocity distribution of turbulent flows of big square plane nozzles,the authors propose the modeling of a turbulent free jet in a wind-tunnel. the free jet mixes with thesurrounding fluid, creating turbulence and the jet grows thicker as a result of the exchange of momentumbetween stagnant air and a portion of the jet. in this study, jets of air ejected from square nozzles of largesizes and flowing into stagnant air are considered. theoretical solutions based on two different turbulencetheories are proposed with coefficients that should be measured experimentally. these coefficients areobtained for a wide range of reynolds numbers and a correlation is also proposed. in different stationsin the axial direction, the velocity distribution appears to have the same shape. this similarity is showneither by theoretical solutions or experimental measurements in this work.