Kinetics of gas bubble nucleation and growth in magmatic melt at its rapid decompression
Kinetics of gas bubble nucleation and growth in magmatic melt at its rapid decompression
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DOI：
10.1063/1.4900846
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发表时间：
2014-11-01
影响因子：
4.6
通讯作者：
Pil'nik, A. A.
中科院分区：
文献类型：
--
作者：
Chernov, A. A.;Kedrinsky, V. K.;Pil'nik, A. A.
本文提出了高粘气饱和岩浆熔体在快速减压条件下的气泡生长模型。结果表明，在较宽的过饱和度范围内，考虑过程的非定常特性是非常重要的。求出了溶解气体浓度分布和气泡长大速率的解析解。建立了全脱气动力学模型。该模型基于对熔体体积中所谓的“禁区”的区分，抑制了新形核中心的形成。得到了成核气泡数目和典型成核时间与初始减压值之间的简单解析关系，以及气相体积浓度随时间的变化关系。我们的结果与现有的实验数据相吻合。(C)2014 AIP出版有限责任公司。
The model of gas bubble growth in high-viscous gas-saturated magmatic melt, subjected to rapid decompression, is presented in the current study. It is shown that consideration of unsteady character of the process is extremely important in a wide range of supersaturation. The analytical solution is found for the profile of dissolved gas concentration and the rate of bubble growth. The model of kinetics of overall degassing is developed. This model is based on distinguishing the so-called "forbidden" zone in the melt volume with suppressed formation of the new nucleation sites. The simple analytical dependences of the number of nucleating bubbles and typical nucleation time on the value of initial decompression were derived together with time dependence of volumetric concentration of the gas phase. Our results match the available experimental data. (C) 2014 AIP Publishing LLC.