A comparative study of UVP and LDA techniques for pulp suspensions in pipe flow
A comparative study of UVP and LDA techniques for pulp suspensions in pipe flow
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UVP和LDA技术在管流中纸浆悬浮液的比较研究
DOI：
10.1002/aic.10653
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发表时间：
2006
期刊：
影响因子：
3.7
通讯作者：
A. Rasmuson
中科院分区：
文献类型：
--
作者：
J. Wiklund;M. Stading;A. Pettersson;A. Rasmuson
第一次，在纸浆悬浮液中的非侵入性测量范围从0.74%（w/w）到7.8%（w/w）的纸浆悬浮液已同时使用超声波速度剖面（UVP）和激光多普勒测速仪（LDA）在实验管流回路。结果表明，这两种技术都可以用来确定活塞流的速度，在更浓的纸浆悬浮液比什么已经报道到目前为止，在文献中有很好的协议。瞬时速度分布已获得非侵入性在管流中使用的UVP技术，它表明，结合同时压降测量，UVP技术可以用来确定屈服应力在线。结果进一步表明，LDA的工作，有限的渗透深度高达几毫米，甚至在强烈不透明的系统，如在7.8%（w/w）纸浆。然而，在近壁区域获得了偏离的结果，需要做更多的工作。© 2005美国化学工程师学会AIChE J，2006
For the first time, noninvasive measurements in pulp suspensions at consistencies ranging from 0.74%(w/w) up to 7.8%(w/w) have been performed simultaneously using ultrasound velocity profiling (UVP) and laser doppler anemometry (LDA) in an experimental pipe flow loop. Results show that both techniques can be used to determine the plug flow velocity with good agreement in much more concentrated pulp suspensions than what has been reported so far in the literature. Instantaneous velocity profiles have been obtained noninvasively in pipe flow using the UVP technique, and it is shown that combined with simultaneous pressure drop measurements, the UVP technique can be used to determine the yield stress in-line. Results further show that LDA works, with limited penetration depth of up to several millimeters, even in strongly opaque systems, such as in 7.8%(w/w) pulp. Deviating results were however obtained in the near wall region and more work is needed. © 2005 American Institute of Chemical Engineers AIChE J, 2006