We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
A Comparative Study of UVP and LDA Techniques for Pulp Suspensions in Pipe Flow.
- Authors
Wiklund, Johan A.; Stading, Mats; Pettersson, A. Johan; Rasmuson, Anders
- Abstract
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.
- Subjects
SUSPENSIONS (Chemistry); DISPERSION (Chemistry); SOLUTION (Chemistry); LASER Doppler velocimeter; FLUID dynamic measurements
- Publication
AIChE Journal, 2006, Vol 52, Issue 2, p484
- ISSN
0001-1541
- Publication type
Article
- DOI
10.1002/aic.10653