In this paper, an experimental study is performed to reveal the effects of a bounded plate on vortex formations in the pulsating jet. This investigation is conducted with or without bounded plates above and bellow the nozzle exit. A pulsed hydrogen bubble technique is used to observe the vortex formation from rectangular cross section nozzle of an aspect ratio of 5. The pulsating jet is generated by superimposing large amplitude and low frequency pulsation on the steady flow. Obtained results are as follows: The vortex pairs are formed at the interval of the pulsation period. The flow patterns are affected by bounded plate. A vortex pair generates near the nozzle exit keeps symmetric with respect to the jet axis and flows downstream with moving away from the jet center line. The distance between a vortex pair without the bounded plates is longer than that with bounded plates. The vortex with bounded plates moves faster downstream than that without bounded plates.

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