Abstract
A development process of a low-density jet, such as a helium gas and a hot air jets, is different from that of a constant-density jet. Side jets, which are radial ejections, are formed at vicinity of the nozzle exit and mixing of fluids between the jet and the surroundings is enhanced. Helium gas jets were discharged from a round nozzle upward and visualized by planar laser Mie scattering (PLMS). A configuration of the side jets varies with Reynolds number. Side jets at low Reynolds number are similar to a bifurcation. A flow structure of the side jets at low Reynolds number was observed using a high-speed video camera. The side jets at the low Reynolds number is generated periodically.
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