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首页> 外文会议>Selected Papers from the 9th International Symposium on Laser Techniques Applied to Fluid Mechanics Lisbon, Portugal, July 13-16, 1998 >VI.7. 3-D measurements of bubble motion and wake structure in two-phase flows using 3-D scanning particle-image-velocimetry (3-D SPIV) and stereo-imaging
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VI.7. 3-D measurements of bubble motion and wake structure in two-phase flows using 3-D scanning particle-image-velocimetry (3-D SPIV) and stereo-imaging

机译：VI.7。使用3-D扫描粒子图像测速仪（3-D SPIV）和立体成像对两相流中的气泡运动和尾流结构进行3-D测量

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Scanning-Particle-Image-Velocimetry is used in combination with a stereoscopic mirror system to record the three-dimensional wake structure and the bubble coordinates simultaneously over time in a bubbly two-phase flow. Pulsed planar swarms of 8 bubbles with a mean diameter of 0.8 can were released simultaneously in a water tank and where retained in the same vertical position during the observed period by an imposed counter water stream. For the bubble size studied we found a regular shedding of hairpin vortices building a chain of vortex loops in the wake downstream. The results demonstrate the important roel of the wake for the bubble interaction. Only when trailing bubbles are captured within a wake of leading ones, bubble collision and possibly coalescence happens. A video-animation of the temporal evolution of the flow demonstrates this dynamic process which is difficult to express in single pictures.
机译：扫描颗粒图像测速技术与立体镜系统结合使用，可在气泡状两相流中随时间同时记录三维尾流结构和气泡坐标。可以在水箱中同时释放平均直径为0.8的8个气泡的脉冲平面群，并在一定时间内通过施加反向水流将其保持在相同的垂直位置。对于所研究的气泡大小，我们发现发夹涡流有规律地脱落，在下游尾流中建立了一系列涡流环。结果证明了尾流对于气泡相互作用的重要作用。只有在尾部气泡被尾部气泡捕获后，气泡才会发生碰撞并可能聚结。流的时间演变的视频动画演示了这种动态过程，难以在单个图片中表达。

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