منابع مشابه
Viscosity models for silicate melts
Rheology of silicates (melts or super cooled as glasses) is one of the most important fields to mankind, as geological activity largely influences life. In this paper, unifying empirical models for the Non-Newtonian shear viscosity and the extensional viscosity are proposed. The models have only one parameter, the zero shear viscosity (the Newtonian plateau), and are valid for a vide range of c...
متن کاملAn experimental study on the pressure dependence of viscosity in silicate melts.
The effect of pressure on melt viscosity was investigated for five compositions along the join An(CaAl(2)Si(2)O(8))-Di(CaMgSi(2)O(6)) and four alkali silicates containing lithium, sodium, and potassium in constant ratio of approximately 1:1:1, but alkali-silica ratios are varying. The experiments were performed in an internally heated gas pressure vessel at pressures from 50 to 400 MPa in the v...
متن کاملIn Situ Falling Sphere Measurements of the Viscosity of Silicate Melts at High Pressures
Introduction Experimental measurements of viscosity are critical to understanding igneous processes in the Earth’s mantle that control the rate of extraction of melts from partially molten source regions and the time scales for magma mixing. Traditionally, the settling velocity of a highdensity sphere through a molten sample is determined from the initial and final positions of the sphere and e...
متن کاملViscosity and Anelasticity of Melts
is the Maxwell relaxation time [24]. This relaxation time is a convenient approximation to the timescale of deformation where the transition from purely viscous behavior to purely elastic behavior occurs. The purely viscous response of a silicate melt is termed “liquid” behavior whereas the purely elastic response is termed “glassy” behavior. The term silicate melt is used to describe molten si...
متن کاملPressure Dependence of Viscosity of Glassforming Melts
We suggest a model in which viscosity η is related to entropy of the system. The model successfully describes the dependence of viscosity on pressure. A master equation is developed that allows a comparison of data obtained at different temperatures. Earlier, in the framework of the same model we described the dependence of viscosity on temperature. The present treatment gives a simple interpre...
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ژورنال
عنوان ژورنال: Journal of Non-Newtonian Fluid Mechanics
سال: 2004
ISSN: 0377-0257
DOI: 10.1016/j.jnnfm.2004.07.005