Microrheological observations of the onset of non-Newtonian behavior in suspensions
As the column fraction of solids increases above about 0.30, suspensions of non-Brownian, uniform spheres in Newtonian liquids begin to exhibit shear-thinning, normal stresses, and other non- Newtonian behavior. Here, we report on observations obtained from falling-ball and capillary rheometry at these high volume fractions. Specifically, we find that measured viscosity values are dependent on the size-scale of the viscometer (cylinder diameter, D, and falling- ball diameter, d) relative to the diameter of the suspended spheres d/sub s/. We report the dependence of the measured viscosity on the ratios d/d/sub s/, D/d, and D/d/sub s/, as well as critical values of these ratios above which the apparent viscosity is constant. 5 refs., 3 figs., 1 tab.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA); Los Alamos National Lab., NM (USA)
- DOE Contract Number:
- AC04-76DP00789; W-7405-ENG-36
- OSTI ID:
- 6910484
- Report Number(s):
- SAND-87-2054C; CONF-880827-3; LA-UR-88-582; ON: DE88006198
- Country of Publication:
- United States
- Language:
- English
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