Hydrodynamic particle migration in small-amplitude, oscillatory, circular couette flow: The limits of reversibility

Conference · Wed Jan 01 04:00:00 EST 1992

DOI:https://doi.org/10.1016/B978-0-444-89007-8.50251-3· OSTI ID:5225582

Brenner, H ^[1]; Altobelli, S A ^[2]; Graham, A L; Abbott, J R ^[3]; Monday, L A ^[4]

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1. Massachusetts Inst. of Tech., Cambridge, MA (United States). Dept. of Chemical Engineering
2. Lovelace Medical Foundation, Albuquerque, NM (United States)
3. Los Alamos National Lab., NM (United States)
4. Sandia National Labs., Albuquerque, NM (United States)

Initially well-mixed suspensions of large spherical particles in viscous Newtonian fluids subjected to continuous nonhomogeneous shear flows demix and establish large concentration gradients. A number of experimental studies have determined that the particles migrate to the low shear-rate region in one-dimensional flow fields. Other investigators have proposed mechanisms to model the migration caused by the presence of nonuniform shear gradients. Here, we report on the shear-induced migration of particles in the annular space between two coaxial cylinders (a wide-gap Couette), with the inner cylinder oscillating and the outer cylinder fixed. In these experiments, the conditions are such that colloidal and inertial forces do not exert an appreciable effect on the suspensions of neutrally bouyant spherical particles in Newtonian liquids. Nuclear magnetic resonance (NMR) imaging is used to measure the concentration profile during the demixing of the initially well-mixed suspensions.

• Research Organization: Los Alamos National Lab., NM (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-36; AC04-76DP00789
• OSTI ID: 5225582
• Report Number(s): LA-UR-92-633; CONF-920852--1; SAND--91-2273C; ON: DE92008480
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
42 ENGINEERING
420400 -- Engineering-- Heat Transfer & Fluid Flow
COUETTE FLOW
DIAGNOSTIC TECHNIQUES
DISPERSIONS
ESTERS
FLUID FLOW
INTERFACES
MIGRATION
NMR IMAGING
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PMMA
POLYACRYLATES
POLYMERS
POLYVINYLS
RHEOLOGY
SUSPENSIONS
VISCOUS FLOW