Microstructure and momentum transport in concentrated suspensions
- Sandia National Labs., Albuquerque, NM (United States)
- Los Alamos National Lab., NM (United States)
- Massachusetts Institute of Technology, Cambridge, MA (United States). Dept. of Chemical Engineering
This paper reviews several coupled theoretical and experimental investigations of the effect of microstructure on momentum transport in concentrated suspensions. An expression to predict the apparent suspension viscosity of mixtures of rods and spheres is developed and verified with falling-ball viscometry experiments. The effects of suspension-scale slip (relative to the bulk continuum) are studied with a sensitive spinning-ball rheometer, and the results are explained with a novel theoretical method. The first noninvasive, nuclear magnetic resonance imaging measurements of the evolution of velocity and concentration profiles in pressure-driven entrance flows of initially well mixed suspensions in a circular conduit are described, as well as more complex two-dimensional flows with recirculation, e.g. flow in a journal bearing. These data in nonhomogeneous flows and complementary three-dimensional video imaging of individual tracer particles in homogeneous flows are providing much needed information on the effects of flow on particle interactions and effective theological properties at the macroscale.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (United States); AT and T Technologies, Inc., Albuquerque, NM (United States); Los Alamos National Lab., NM (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC04-94AL85000; AC04-76DP00789; W-7405-ENG-36
- OSTI ID:
- 243498
- Report Number(s):
- SAND--96-1384C; CONF-9605186--1; ON: DE96011839
- Country of Publication:
- United States
- Language:
- English
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