This study experimentally investigates a jet flow issued into a two-layer density-stratified fluid in a tank and the resultant mixing phenomena. The upper and lower fluids are water and a NaClwater solution, respectively, with the lower fluid issued vertically upward from a circular nozzle mounted on the tank bottom. Experimental highlights of the jet behavior and mixing phenomena are classified into three patterns according to the jet Reynolds number and mass concentration of the NaCl-water solution. The internal density current clearly occurs along the density interface, and the maximum jet height is predicted by the Froude number defined by the density difference between the upper and lower fluids. The effect of fluid thickness on the maximum jet height is also clarified.

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Jet flow ， iSsued into a density − stratified Huid in a tank ， and 七he resultant mixing phenom − ena are simula 七ed ． The veLoCity and concentration fields were experimentaily investigated by the authors ， previeus study ． The upper and lower fiuids are water and NaCl − water solution respeCtively ， and the lower fiuid is issued vertically upward from a nozzle at the bottom of the tank ． The simulation highlights that the jet behavieT depends on the Reynolds number and that it agrees well wit11 七 he experimental result ． The simulation also demonstrates that 七 he mbdng between two Huids ， prometed with the vortical How

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