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Theory of Flow Properties of Attapulgite Suspension in Water. A Method for Determining the Relaxation‐Time Parameter β

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4 Author(s)
Gabrysh, A.F. ; Institute for the Study of Rate Processes and Department of Metallurgy, University of Utah, Salt Lake City, Utah ; Eyring, Henry ; Shimizu, Michie ; Asay, Jeanette

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In two previous papers the stress-strain-time relations with respect to variables of temperature, concentration, and pH were given for attapulgite suspension in water, in terms of rheopexy (dilatancy) and thixotropy. Stress relaxation and script S-like curves showing both thixotropy and rheopexy were determined at various temperatures. Yield-point viscosities for the rheopectic and thixotropic curves showed activation energies of about 1 and 2 kcal, respectively. In the present paper Eyring's rate theory of viscosity is briefly discussed in terms of the well known generalized-viscosity equation

η=
i
i=1
 Xiβi 
 αi 
 sinh-1βis˙ 
 βis˙ 
, which is applied successfully to given flow curves. A new method for determining the parameter βi is discussed.

Published in:

Journal of Applied Physics  (Volume:34 ,  Issue: 2 )

Date of Publication:

Feb 1963

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