Reverse transition to hydrodynamic stability through the Schwarzschild line in a supercritical fluid layer.
Reverse transition to hydrodynamic stability through the Schwarzschild line in a supercritical fluid layer.
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DOI：
10.1103/physreve.72.035301
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发表时间：
2005-09
期刊：
影响因子：
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通讯作者：
G. Accary;I. Raspo;P. Bontoux;B. Zappoli
中科院分区：
文献类型：
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作者：
G. Accary;I. Raspo;P. Bontoux;B. Zappoli
我们考虑在底部加热的空腔中接近其气液临界点的流体。由于强烈的密度分层，史瓦西和瑞利稳定性准则在相同的空间尺度是相关的。利用这两个限制之间的竞争的对流发病标准，我们数值表现出惊人的非Boussinesq效应：反向过渡到稳定通过史瓦西线的热扩散层进行对流，和对流发病内几毫米厚的层根据史瓦西标准。
We consider a fluid close to its gas-liquid critical point in a bottom-heated cavity. Due to strong density stratification, both the Schwarzschild and the Rayleigh stability criteria are relevant at the same space scale. Taking advantage of the competition between these two limits of the convection-onset criterion, we numerically exhibit striking non-Boussinesq effects: the reverse transition to stability through the Schwarzschild line of a heat diffusing layer subjected to convection, and the convection onset inside a few-millimeters-thick layer according to the Schwarzschild criterion.