Accession Number : AD0647354

Title :   USE OF THE HYSTERESIS LOOP METHOD TO STUDY THIXOTROPIC SUSPENSIONS. PART I. BEN-A-GEL/WATER SYSTEM.

Descriptive Note : Interim rept.,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s) : Leonard,J. T. ; Hazlett,R. N.

Report Date : 24 JAN 1967

Pagination or Media Count : 20

Abstract : The rheological behavior of aqueous suspensions of Ben-a-gel, a highly purified magnesium montmorillonite, was studied by the hysteresis loop method. It was found that the plastic viscosities of these suspensions could be related to concentration by Arrhenius' law at low concentrations or Weltmann and Green's equation at higher concentrations. The transition from one exponential law to the other occurs at about 1.1 vol-% of Ben-a-gel, the concentration at which the gel strength is sufficiently developed so that the suspension no longer flows from an inverted container. The values for the various yield points characterizing the hysteresis loop also bear exponential relationships to concentration and show similar transitions at about 1.1 vol-% of Ben-a-gel. The results of the study indicate that Arrhenius' law may be used in conjunction with Weltmann and Green's equation to describe the rheological behavior of an ideal thixotropic suspension over a concentration range covering both the pregelation and postgelation regions. (Author)

Descriptors :   (*THIXOTROPIC ROCKET PROPELLANTS, RHEOLOGY), VISCOSITY, MONTMORILLONITE, MAGNESIUM COMPOUNDS, SILICATES, VISCOELASTICITY, FLUID FLOW, STORAGE, SAFETY, GELS, HYSTERESIS

Subject Categories : Fluid Mechanics
      Rocket Propellants

Distribution Statement : APPROVED FOR PUBLIC RELEASE