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yexuqing木蟲(chóng)之王 (文學(xué)泰斗)
太陽(yáng)系系主任
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[交流]
Shear-induced bubble nucleation in magmas
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巖漿中的剪切誘導(dǎo)氣泡成核 ▲ 作者：Olivier Roche, Jean-Michel Andanson et al. ▲鏈接： https://www.science.org/doi/10.1126/science.adw8543 ▲摘要：巖漿中氣泡的成核作用是控制火山噴發(fā)動(dòng)力的關(guān)鍵因素。這項(xiàng)研究中，研究者聚焦于火山環(huán)境中普遍存在的、由黏性剪切作用觸發(fā)的揮發(fā)性飽和液體成核過(guò)程。 通過(guò)結(jié)合實(shí)驗(yàn)室試驗(yàn)、理論分析和數(shù)值模擬，研究者探究了在揮發(fā)性過(guò)飽和液體中，機(jī)械剪切能量促進(jìn)氣體分子核形成與生長(zhǎng)的條件。 研究結(jié)果表明，成核所需的臨界剪切應(yīng)力隨揮發(fā)性過(guò)飽和度的增加而降低。對(duì)自然體系進(jìn)行的量綱分析顯示，剪切誘變成核很可能發(fā)生在火山通道中，這一發(fā)現(xiàn)對(duì)巖漿脫氣過(guò)程和噴發(fā)模式具有重要啟示。 ▲ Abstract： The nucleation of gas bubbles in magmas is fundamental to controlling the dynamics of volcanic eruptions. In this study, we addressed nucleation in a volatile-saturated liquid triggered by viscous shear, which is ubiquitous in volcanic environments. By combining laboratory experiments, theoretical analysis, and numerical simulations, we investigated the conditions under which the mechanical energy associated with shearing favors the formation and growth of gas molecule nuclei in a liquid supersaturated with volatiles. Our results reveal that the critical shear stress for nucleation decreases as the volatile supersaturation increases. Dimensional analysis applied to natural systems shows that shear-induced nucleation is likely to occur in volcanic conduits, which has implications for magma degassing processes and eruptive styles. |
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