A review of microstructure in concentrated suspensions and its implications for rheology and bulk flow |
| |
Authors: | Jeffrey F Morris |
| |
Institution: | (1) Levich Institute and Department of Chemical Engineering, City College of New York, New York, NY 10031, USA |
| |
Abstract: | An overview of present understanding of microstructure in flowing suspensions is provided. An emphasis is placed on how the
microstructure leads to observable bulk flow phenomena unique to mixtures. The bridge between the particle and bulk scales
is provided by the mixture rheology; one focus of the review is on work that addresses the connection between microstructure
and rheology. The non-Newtonian rheology of suspensions includes the well-known rate dependences of shear thinning and thickening,
which have influence on bulk processing of suspensions. Shear-induced normal stresses are also measured in concentrated suspensions
and include normal stress differences, and the isotropic particle pressure. Normal stresses have been associated with shear-induced
migration, and thus have influence on the ultimate spatial distribution of solids, as well as the flow rate during processing;
a second focus is on these uniquely two-phase behaviors and how they can be described in terms of the bulk rheology. An important
bulk fluid mechanical consequence of normal stresses is their role in driving secondary flows. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|