INADEQUACIES OF VISCOSITY THEORIES FOR VITREOUS KNO3 - Ca(NO3)2.

Abstract

The viscosity of 60% NKO3 - 40% Ca(NO3)2 (% mole) was measured by the beam-bending method and found to be Arrhenius with an activation energy of 138 Kcal/mole. These new data were combined with previously reported capillary and rotation data and gave a smooth plot. The complete viscosity data were used to test the best-known viscosity theories but no reasonable fit was found. As a result of this study it was found that the temperature dependence of the viscosity is not controlled by structural effects such as free volume, configuration entropy, etc., but by activation energy effects in the viscous flow process. Finally, all theories are in error in predicting that the viscosity goes to infinity (in the annealing region) much faster than the measured values indicate. (Author)

Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1969
Accession Number
AD0691450

Entities

People

  • H. Tweer
  • N. Laberge
  • P. B. Macedo

Organizations

  • The Catholic University of America

Tags

Communities of Interest

  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Annealing
  • Energy
  • Flow
  • Heat Of Activation
  • Microvessels
  • Rotation
  • Viscosity
  • Viscous Flow

Readers

  • Materials Science and Engineering.
  • Mathematical Modeling and Probability Theory.
  • Theoretical Analysis.