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首页> 外文期刊>Journal of Volcanology and Geothermal Research >The use of a shear-thinning polymer as a bubbly magma analogue for scaled laboratory experiments
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The use of a shear-thinning polymer as a bubbly magma analogue for scaled laboratory experiments

机译：使用剪切稀疏聚合物作为用于缩放实验室实验的起泡岩浆模拟物

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摘要

Analogue materials are commonly used in volcanology to perform scaled laboratory experiments. Analogue experiments inform on fundamental fluid dynamic, structural and mechanical processes that are typically very difficult to observe and quantify directly in the natural volcanic system. Here we investigate the suitability of an aqueous solution of hydroxyethyl cellulose polymer (HEC) for use as a lava/magma analogue, with a particular focus on its theological behaviour. We characterize a range of physical properties as functions of the concentration and temperature of the solution: density; specific heat capacity: thermal diffusivity; thermal conductivity; surface tension; as well as rheology. HEC has a non-Newtonian, shear-thinning rheology that depends on the concentration and temperature of the solution. We show that the rheology is well described by the Cross model, which was originally developed for polymer solutions, but has also been applied to bubbly magmas. Using this similarity, an approach for scaling analogue experiments that use shear-thinning polymers, like HEC, to bubbly magma is presented. A detailed workflow and a spreadsheet are provided to allow experimentalists to investigate the effects of non-Newtonian behaviour in their existing laboratory set-ups. This contribution will allow for the more complex, but often more realistic case of bubble-bearing magmas to be rigorously studied in experimental volcanology. (C) 2020 The Authors. Published by Elsevier B.V.
机译：模拟材料通常用于Volcanology以进行缩放的实验室实验。模拟实验通知基本的流体动态，结构和机械过程，这通常很难直接在天然火山系统中观察和量化。在这里，我们研究了羟乙基纤维素聚合物（HEC）水溶液用作熔岩/岩浆模拟的适用性，特别关注其神学行为。我们将一系列物理性质表征为溶液浓度和温度的功能：密度;比热容量：热扩散率;导热系数;表面张力;以及流变学。 HEC具有非牛顿，剪切稀疏流变学，其取决于溶液的浓度和温度。我们表明，流变学由横梁良好描述，其最初是为聚合物溶液开发的，但也已应用于摩擦磁带。使用这种相似性，提出了一种用于缩放使用剪切变薄聚合物，如HEC的模拟实验的方法。提供详细的工作流程和电子表格，以允许实验者调查非牛顿行为在现有实验室设置中的影响。这种贡献将允许更复杂，但通常在实验性火山学中严格研究含气泡的岩浆的更具现实的情况。 （c）2020作者。由elsevier b.v出版。

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