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首页> 外文期刊>Journal of Volcanology and Geothermal Research2012V243-244NOCT,15 >Modelling the initiation of dust eruptions
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Modelling the initiation of dust eruptions

机译：模拟起尘爆发

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摘要

We present a new model for the initiation of high-speed eruptive two-phase dust flows in the laboratory. Shock-tube experiments have been conducted on beds of solid particles in nitrogen under high pressure, which are suddenly decompressed. Our model is successful in explaining the slab-like structures that are often observed during initiation of bed movement, by considering the interaction between the compressible flow of gas through the bed and the stress field in the particle bed, which ruptures when bed cohesion is overcome by the effective stress in the bed generated by the gas flow. Our model includes the effects of overburden and wall friction, and predicts that all layered configurations will rupture initially in this fashion, consistent with experimental observation. We also find that the modelled dependence of layer size on particle size is a good match to experiment. The volcanological implication is that the source in Vulcanian and Plinian eruptions is typically heterogeneous in nature. (C) 2015 Elsevier B.V. All rights reserved.
机译：我们提出了一种在实验室中引发高速喷发两相粉尘流的新模型。已经在高压下在氮气中的固体颗粒床上进行了突然减压的激波管实验。我们的模型通过考虑通过床的气体可压缩流与颗粒床中的应力场之间的相互作用，成功地解释了在床运动开始时经常观察到的板状结构，当克服了床的内聚力时破裂由气流产生的有效应力作用于床层。我们的模型包括覆盖层和壁面摩擦的影响，并预测所有分层结构都会以这种方式初始破裂，这与实验观察一致。我们还发现，建模的层大小对粒度的依赖性与实验非常匹配。火山学意义是，伏尔加尼亚和普利尼亚火山爆发的来源通常在性质上是异质的。 （C）2015 Elsevier B.V.保留所有权利。

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