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Authors: Costa, A.*
Caricchi, L.*
Bagdassarov, N.*
Title: A model for the rheology of particle-bearing suspensions and partially molten rocks
Title of journal: Geochem. Geophys. Geosyst
Series/Report no.: 3/10(2009)
Publisher: AGU and the Geochemical Society
Issue Date: 18-Mar-2009
DOI: 10.1029/2008GC002138
Keywords: melts
concentrated suspensions
strain rate
Abstract: This contribution presents a semiempirical model describing the effective relative viscosity of crystalbearing magmas as function of crystal fraction and strain rate. The model was applied to an extensive data set of magmatic suspensions and partially molten rocks providing a range of values for the fitting parameters that control the behavior of the relative viscosity curves as a function of the crystal fraction in an intermediate range of crystallinity (30–80 vol % crystals). The analysis of the results and of the materials used in the experiments allows for evaluating the physical meaning of the parameters of the proposed model. We show that the model, by varying the parameters within the ranges obtained during the fitting procedure, is able to describe satisfactory the effective relative viscosity as a function of crystal fraction and strain rate for suspensions having different geometrical characteristics of the suspended solid fraction.
Description: An edited version of this paper was published by AGU. Copyright (2009) American Geophysical Union
Appears in Collections:05.01.03. Inverse methods
04.01.05. Rheology
04.08.03. Magmas
Papers Published / Papers in press

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