Abstract
It has been known that the side jets are formed in a round jet when the density of the jet fluid is lower than that of the ambient fluid. The density ratio between the jet fluid and the ambient fluid for the side-jet formation is generally lower than 0.7. However, it is found out that flow structure similar to the side jets in a round helium gas jet exists in a round air jet, namely uniform-density jet, by the flow visualization in the jet shear layer and the three-dimensional imaging of the jet. In this experiment, the flow structure similar to the side jets is generated in the air jet when the jet Reynolds number is from 2,000 to 3,000, although the density ratio is 1.
