The Influence of Crystal Size Distributions on the Rheology of Magmas: New Insights From Analog Experiments
The Influence of Crystal Size Distributions on the Rheology of Magmas: New Insights From Analog Experiments
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DOI：
10.1002/2017gc007114
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发表时间：
2017-11-01
影响因子：
3.5
通讯作者：
Castro, Jonathan M.
中科院分区：
文献类型：
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作者：
Klein, Johannes;Mueller, Sebastian P.;Castro, Jonathan M.
本研究以硅油中的球形玻璃微珠作为岩浆当量，通过模拟实验考察了颗粒粒度分布对颗粒悬浮液流变性的影响。对274个不同形态(单峰、双峰、三峰和四峰)的单个颗粒悬浮液以及具有特定定义的偏斜度和方差的多通道悬浮液的分析是此类数据的第一次，并为悬浮液的固体颗粒与其流变行为之间的关系提供了重要的见解。由于颗粒悬浮液的流变性与其最大堆积分数m之间的关系可以用多种理论模型来很好地建立，因此本研究的模拟实验结果表明，多分散性对m的影响最大，因此，对颗粒尺寸分布的多分散性的估计对于估算该悬浮液的粘度是至关重要的。
This study examines the influence of particle-size distributions on the rheology of particle suspensions by using analog experiments with spherical glass beads in silicone oil as a magma equivalent. The analyses of 274 individual particle-bearing suspensions of varying modality (unimodality, bimodality, trimodality, and tetramodality), as well as of polymodal suspensions with specific defined skewness and variance, are the first data set of its kind and provide important insights into the relationship between the solid particles of a suspension and its rheological behavior. Since the relationship between the rheology of particle-bearing suspensions and its maximum packing fraction m is well established by several theoretical models, the results of the analog experiments of this study reveal that the polydispersity exerts the largest influence on m. Consequently, the estimation of the polydispersity of a particle-size distribution is essential for estimating the viscosity of that given suspension.