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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Fluid oscillations in a laboratory geyser with a bubble trap
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Fluid oscillations in a laboratory geyser with a bubble trap

机译：带气泡阱的实验室间歇泉中的流体振荡

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Geysers are rare geologic features that episodically erupt water and steam. While it is understood that the eruptions are triggered by the conversion of thermal to kinetic energy during decompression of hot fluids, geysers commonly exhibit a range of dynamic behaviors in-between and during eruptions that have yet to be adequately explained. In-situ measurements of temperature and pressure as well as remote geophysical techniques have revealed oscillatory behavior across a range of timescales from eruption cycles to impulsive bubble collapse events. Many geysers, including Old Faithful in Yellowstone National Park, USA, are believed to have laterally-offset subsurface reservoirs (referred to as a 'bubble trap') that can trap and accumulate noncondensable gas or steam entering the system. The impact of a bubble trap on the dynamic behaviors of the system, however, has not been fully established. We constructed a laboratory bubble trap and performed a series of experiments to study how fluids oscillate back and forth between the eruption conduit and laterally-offset reservoir in-between eruptions. We present a new theoretical model based on Hamiltonian mechanics that successfully predicts the oscillation frequencies observed in our experiments based on the conduit system geometry, the amount of gas that has accumulated in the bubble trap, and the amount of liquid water in the system. We demonstrate that when scaled to Old Faithful Geyser, this mechanism is capable of producing oscillations at the observed frequencies. (C) 2018 Elsevier B.V. All rights reserved.
机译：间歇泉是罕见的地质特征，会突然喷出水和蒸汽。虽然可以理解，喷发是在热流体减压期间由热能转换为动能触发的，但间歇泉通常在喷发之间和喷发期间表现出一系列动态行为，但尚未充分解释。温度和压力的现场测量以及远程地球物理技术已经揭示了从喷发周期到脉冲气泡破裂事件的整个时间范围内的振荡行为。许多间歇泉，包括美国黄石国家公园的老忠实喷泉，都被认为具有侧向偏移的地下储层（被称为“气泡阱”），可以捕获和积聚进入系统的不可凝性气体或蒸汽。但是，气泡陷阱对系统动态行为的影响尚未完全确定。我们构造了一个实验室气泡收集器，并进行了一系列实验，以研究流体如何在喷发之间的喷发导管和侧向偏移储层之间来回振荡。我们提出了一个基于哈密顿力学的新理论模型，该模型成功预测了基于管道系统几何形状，气泡收集器中累积的气体量以及系统中的液态水量的实验中观察到的振荡频率。我们证明，当缩放至“老忠实间歇泉”时，此机制能够在观察到的频率上产生振荡。 （C）2018 Elsevier B.V.保留所有权利。

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