Accession Number : ADA141210

Title :   Kinetic-Elastic Approach for Time-Dependent Rheological Data on Slurry Fuels and Polymers.

Descriptive Note : Final technical rept. 24 Mar 80-30 Sep 82,


Personal Author(s) : Brodkey,R S ; Park,K ; Weng,S ; Ouibrahim,A ; Lin,S F

PDF Url : ADA141210

Report Date : Jan 1984

Pagination or Media Count : 222

Abstract : At The Ohio State University, we have been developing our kinetic interpretation of non-Newtonian fluid behavior under support from the Aero Propulsion Laboratory with materials of interest to the Air Force. Specifically, we have considered slurry fuel systems and a reference, high-viscosity lubricant (5P4E). In addition, we continued to obtain data on a polymeric system previously studied by us so as to ascertain the adequacy of our measurements and of our theory. The kinetic theory is a phenomenological rate concept used to describe the time rate of change of a material structure. We call this part of the development 'the kinetic model for thixotropic change,' corresponding to thixotropic fluid structure' is a thixotropic structural viscosity and a corresponding thixotropic stress. The real stress in the system is different from the thixotropic stress because of the elastic properties of the material. Our 'elastic model for viscoelasticity' utilizes a modified version of Oldroyd's development in convected coordinates. A combination of the two models allows the representation of rheological data with what we call 'the kinetic-elastic model'. To date we have shown conclusively that much of the older data could not be used because of instrumentation problems. We have obtained new polymer data (polymethylmethacrylate in DEP, PMMA/DEP) with our improved instrumentation and data acquisition system.

Descriptors :   *Rheology, *Slurry fuels, *Polymers, *Kinetic theory, Jet engine fuels, Carbon black, Thinness, Thickness, Elastic properties, Solutions(Mixtures), Lubricants, Nonnewtonian fluids, Fluid flow, Viscosity, Rates, Transitions, Stresses, Models, Viscoelasticity, Polymethyl methacrylate, Shear properties, Yield strength, Curve fitting

Subject Categories : Lubricants and Hydraulic Fluids
      Numerical Mathematics
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE