Abstract
Inflow phenomenon in near field of buoyant jet issuing into still surrounding of water is studied experimentally and numerically. The experimental visualization is carried out using 3D LIF technique, which visualizes the three-dimensional inflow phenomenon in the near field of buoyant jet. It is found from the experiment that the inflow phenomenon starts in the near field of buoyant jet when the Froude number becomes lower than the critical inflow condition. In order to understand the physics of inflow phenomenon, numerical simulation is carried out. The numerical result reproduces well the critical inflow condition observed by experiment. With further decrease in Froude and Reynolds numbers, the vigorous fluid mixing is found in the experiment, which is due to the appearance of turbulence in the jet caused by the inflow phenomenon.
