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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Lubrication effects on magmatic mush dynamics
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Lubrication effects on magmatic mush dynamics

机译：对岩浆糊动动力学的润滑效应

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Silicic magma bodies are formed by repeated injections of mobile magma and reside as a crystal-rich mush. Numerical studies of open-system events have revealed the complexity of mixing and rheological behavior. This is associated with the dilation of the crystal network and the possible occurrence of a lubricated regime. Lubrication forces are hydrodynamic interactions occurring when neighboring crystals have relative motion. The effect of such dissipative forces has not yet been explored in the case of magmatic mush. Here, we investigate the effects of lubrication on mush dynamics and on magma transport. First, we propose scaling relationships to assess the relative importance of the forces controlling the motion of one crystal within a mush by adding lubrication terms into the Basset-Boussinesq-Oseen equation that describes crystal motion in a viscous melt. We then investigate lubrication effects at the macroscopic scale with computational fluid dynamics with discrete element modeling (CFD-DEM) simulations that include these forces. We explore two cases: crystal mush sedimentation and the injection of a crystal-free magma inside a mush. We perform all simulations twice, with and without lubrication forces, and compare the results. At the grain scale, we show that three dimensionless numbers and the crystal content can describe the competition between viscous drag, buoyancy, and lubrication. Two of these numbers (Stokes and Froude numbers) have been previously employed in the context of dilute suspensions. The third is a new form of the Sommerfeld number that measures the importance of lubrication. At the macroscopic scale, simulation pairs (with and without lubrication forces) exhibit very similar behavior when in steady state. The duration of the transient regime preceding steady state, however, is increased when lubrication forces are included. Lubrication causes an apparent bulk strain hardening followed by softening at the initiation of the mush motion. Our results show that lubrication opposes dilation and the initiation of motion within the magmatic mush during this transient phase. Our results highlight the control that the crystal network exerts on magma transport and provide a novel way to evaluate when lubrication matters. (C) 2019 Elsevier B.V. All rights reserved.
机译：硅状岩浆体由重复注射移动岩浆，并将其居住为富含晶体的糊状物。开放式系统事件的数值研究表明了混合和流变行为的复杂性。这与晶体网络的扩张和可能发生的润滑制度相关联。当相邻晶体具有相对运动时，润滑力是发生的流体动力学相互作用。在岩浆糊状物的情况下尚未探讨这种耗散力的效果。在这里，我们调查润滑对糊状动力学和岩浆运输的影响。首先，我们提出通过将润滑术语添加到描述粘性熔体中的晶体运动中的泡沫 - Boussinesq-OSEEN等式中，评估控制一个晶体中的运动运动的力的相对重要性。然后，我们在宏观尺度下调查脉冲效果，其具有包括这些力的离散元素建模（CFD-DEM）模拟的计算流体动力学。我们探索两种情况：水晶糊状沉降和在糊状物内注射无晶体的岩浆。我们两次执行所有模拟，随着润滑力，并比较结果。在谷物规模，我们表明三个无量纲数和晶体含量可以描述粘性阻力，浮力和润滑之间的竞争。这些数字中的两个（Stokes和Froude号码）已经在稀释悬浮液的背景下使用。第三是一种新形式的Sommerfeld号，测量润滑的重要性。在宏观刻度下，在稳定状态下，仿真对（具有和无润滑力）表现出非常相似的行为。然而，当包括润滑力时，瞬态调节的持续时间增加。润滑导致表观体菌株硬化，然后在糊状运动的开始时软化。我们的结果表明，在该瞬时相期间，润滑反对岩浆糊状物内的运动引发。我们的结果强调了晶体网络对岩浆运输的控制，并提供了一种在润滑事件时评估的新方法。 （c）2019 Elsevier B.v.保留所有权利。

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