Laser stripe measurements of near-wall solid fraction in channel flows of liquid-granular mixtures
Resource
Experiments in fluids, 50(6), 1507-1525
Journal
Experiments in Fluids
Pages
1507-1525
Date Issued
2011
Date
2011
Author(s)
Abstract
A simple, robust, and accurate imaging technique is proposed to measure granular concentration profiles in channel flows of liquid-granular mixtures. We focus on moderate to high granular concentrations (5-50%), for which optical access is restricted to regions close to a transparent wall. To measure concentrations in this range, we illuminate solid grains moving near the wall using a transverse laser light sheet. The evolving shape of the laser stripe, deformed by passing grains, is then monitored using an oblique camera. Statistics of the granular distance to wall can thus be acquired and converted to volumetric solid fraction measurements. The method is verified using fluidization cell tests and applied to open-channel sheet flow experiments. Free of any parameter adjustment, the laser stripe method is found to yield good results, and allows joint measurements of granular velocity and solid fraction profiles. © Springer-Verlag 2010.
Type
journal article
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