Determination of 3-D Flow Fields in Agitated Vessels by Laser-Doppler Velocimetry: Use and Interpretation of RMS Velocities
Determination of 3-D Flow Fields in Agitated Vessels by Laser-Doppler Velocimetry: Use and Interpretation of RMS Velocities
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通过激光多普勒测速法测定搅拌容器中的 3-D 流场：RMS 速度的使用和解释
DOI：
10.1205/026387698524640
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发表时间：
1998
影响因子：
3.9
通讯作者：
J. Bertrand
中科院分区：
文献类型：
--
作者：
P. Mavros;C. Xuereb;J. Bertrand
激光多普勒测速测量已被用来计算的水力和能量效率和湍流结构的三个搅拌器，一个Rushton涡轮机和两个轴向搅拌器：一个Mixel TT和Lightnin A310。Mixel TT具有最高的效率，而在粘性液体（1%CMC溶液）中，所有三种都具有非常低的效率。能量主要耗散在流出叶轮区域的气流和主循环回路中。湍流长度尺度估计为D/5的顺序为湍流状态和D/20的过渡流状态。用平均速度和均方根速度计算切换概率，模拟搅拌槽内的随机流动。
Laser Doppler velocimetry measurements have been used to calculate the hydraulic and energetic efficiency and turbulence structure for three agitators, a Rushton turbine and two axial agitators: a Mixel TT and a Lightnin A310. The Mixel TT had the highest efficiencies, while in a viscous liquid (1% CMC solution) all three had comparably low efficiencies. Energy was dissipated mainly in the stream flowing out of the impeller region and in the main circulation loop. The turbulence length scale was estimated to be of the order of D/5 for the turbulent flow regime and of D/20 for the transitional flow regime. The mean and rms velocities were used to calculate the switching probability, used to simulate stochastically the flow in agitated vessels.