The structure and mixing of impulsively started jets have been studied in a water tank utilizing an acid-base reaction. The flow consists of a starting vortex that separates from the rest of the jet in the near field. Penetration of the jet tip scales with the square root of tie, normalized by the nozzle diameter and velocity. The celerity of the jet tip is approximately one-half of the centerline velocity of steady jet, with the same nozzle exit velocity, at the same location.
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