Abstract
The behavior of a horizontal turbulent round jet␣in a linearly density-stratified fluid is studied and compared to the unstratified case using digital particle-tracking velocimetry (DPTV). Close to the nozzle, the stratified jet grows axisymmetrically at the same rate as an unstratified jet. At a critical distance downstream, the vertical growth is suppressed, while the lateral spreading increases. The self-similar nature of unstratified round jets is not preserved in the stratified case. The velocity field and turbulent stresses are affected by the stratification closer to the jet nozzle than is expected from the flow visualization observations. In particular, the vertical normal stress and shear stress are significantly reduced compared to the unstratified case.
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