Demixing effects in laminar shearing flows: A practically useful approach
✍ Scribed by Sushant Agarwal; Rakesh K. Gupta; Deepak Doraiswamy
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 812 KB
- Volume
- 76
- Category
- Article
- ISSN
- 0008-4034
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✦ Synopsis
Abstract
The phenomena of shear‐induced agglomeration and shear‐induced migration in a non‐ colloidal particulate suspension were examined in different flow fields. The shear flow of a model suspension consisting of spherical glass beads in an aqueous corn syrup with added surfactant was studied in homogeneous and non‐homogeneous flow fields (cone‐and‐plate, parallel plate and laminar flow in a tube). It was found that there was a rapid increase in the average agglomerate size followed by leveling off at long times resulting in an equilibrium particle size. This equilibrium particle size was found to be a strong function of the applied shear rate. It was further found that agglomerate data from the different flow fields superposed well, and, at least in the range of solid volume fractions considered, particle migration was negligible. This work provides a simple technique for quantifying demixing in laboratory experiments and applying the results to industrially relevant situations.