Viscosity of high crystal content melts: Dependence on solid fraction

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Viscosity of high crystal content melts: dependence on solid fraction

The rheological properties of suspensions containing high solid fractions are investigated. Attention is focused on viscosity of sil-icate and magmatic melt systems. A general empirical equation which describes the relative viscosity of suspensions as a function of suspended solid fraction is proposed. In the limit of very dilute solid concentrations it reduces to the Einstein equation. The pro...

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Comments on “Viscosity of high crystal content melts: dependence on solid fraction”

where η is the relative viscosity, φ the volume fraction of particles, B the Einstein coefficient (with a theoretical value B = 2.5), and α, β, γ are three adjustable parameters. The proposed parameterisation approximately reduces to the classical, well established relationships for small fractions. On the other hand, a weak point of equation (1) is that for large φ, the relative viscosity tend...

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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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An 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...

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Ultralow viscosity of carbonate melts at high pressures.

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ژورنال

عنوان ژورنال: Geophysical Research Letters

سال: 2005

ISSN: 0094-8276

DOI: 10.1029/2005gl024303