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In order to study the effect of wall on the flow pattern for the submerged turbulent water jet in narrow channels, the flow field was visualized by a laser-induced fluorescence (LIF) system in different Reynolds numbers.Those images showed that flow motion in a narrow channel is different than that of turbulent plane jet without narrow channels.There are three flow patterns in narrow channels: stable impinging, stable jet with recireulation vortices and flapping turbulent jet.