An extensive experimental investigation of radial profiles of concentration-weighted particle velocities was carried out by simultaneously measuring local transient particle velocity, solids concentration and solids flux using a three-fibre optical probe at five axial levels and seven radial locations in a 0.2 m diameter riser operating over a wide range of solids circulation fluxes (198 to 350 kg/m~2s) and superficial gas velocities (6 to 8 m/s). Particle velocities averaged over time and concentration-weighted particle velocities were compared and found to differ from each other, the latter being smaller than the former at most radial locations. The difference, which results from the correlation between velocity and voidage fluctuations, was more pronounced for high-density conditions.
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机译：通过在五个轴向水平下同时测量局部瞬态颗粒速度，固体浓度和固体通量，在0.2M直径的0.2M直径提升管中同时使用三纤维光学探针同时测量局部瞬态粒子速度，固体浓度和固体通量进行广泛的浓缩粒子速度的实验研究。在各种固体循环通量（198至350 kg / m〜2s）和浅表气体速度（6至8米/米）上运行。比较随时间和浓度加权颗粒速度平均的颗粒速度，并且发现彼此不同，后者小于前者在最径向位置。差异来自速度和空隙波动之间的相关性，对于高密度条件更加明显。
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