Physics
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.1515a&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 14, p. 1515-1518
Physics
10
Ammonia, Aqueous Solutions, Binary Systems (Materials), Creep Tests, Deformation, Icy Satellites, Planetary Geology, Shear Creep, Viscosity, Activation Energy, Melting, Rheology, Viscometers
Scientific paper
The steady-state deformation of paritally melted ice in the ammonia-water system was studied by means of a concentric cylinder viscometer in shear stresses, 10 kPa approximately 0.1 MPa, temperatures, 180 approximately 210 K and NH3 contents, 4.0 approximately 8.4%. The flow law found was of a non-Newtonian power-law type; the stress exponent was 4.0 +/- 0.1. The activation energy at constant melt fractions was 33.7 +/- 0.8 kJ/mol, which was close to that of viscosity for aqueous ammonia solutions. However, the effective viscosity of paritally melted ice estimated at 0.1 MPa was 107 approximately 1010 Pa s, which is about ten orders of magnitudes larger and smaller than that of the ammonia-water mixture in the liquid and solid phases (below a peritectic point, 176 K), respectively.
Arakawa Masahiko
Maeno Norikazu
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