Abstract
Flow structures are inherently three-dimensional (3D). In order to examine complex flow fields, such as side jets, it is necessary to watch the time variation of the 3D flow structure. In the present work we focused on the flow visualization of a gaseous jet flow with side jets. It is specifically the vicinity of a jet nozzle issuing helium gas vertically into ambient air. Cross-sectional images of the gaseous flow-field into which very small particles such as smoke are mixed can be visualized through the Mie scattering using a laser sheet. The optical system for the scanning laser sheet consists of a continuous wave laser source, lenses, and a galvano-scanner mirror. A large number of instantaneous cross-sectional images of the flow field are recorded almost simultaneously using a high-speed digital video camera. The 3D flow visualization is constructed by volume-rendering the cross-sectional images through image processing. The result is a 3D visualization of the time variation of a helium gas jet at the vicinity of the nozzle exit. In addition, the cross-sectional structure of the jet in any direction can be obtained by slicing the constructed image.
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