Convective instabilities induced by an exothermic autocatalytic chemical reaction.
Convective instabilities induced by an exothermic autocatalytic chemical reaction.
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由放热自催化化学反应引起的对流不稳定性。
DOI：
10.1103/physreve.52.1606
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
Simoyi
中科院分区：
文献类型：
--
作者：
Martincigh;Simoyi
可激发或可激发的放热化学反应在被触发时可以产生化学反应性的行进前沿。波传播的动力学受到波前处产生的热量的极大影响，而波前处产生的热量又是（非线性）反应动力学、焓变和反应程度的函数。这里研究的化学反应表现出复杂的传播模式，包括加速大浪，对流卷，双扩散对流，和时空模式。一个用来解释这种模式的模型涉及一个横向加热的流体层，其中基本流动以热液波的形式失去稳定性。波动之前是热区和冷区之间的全球环流，其速度与横向温度梯度成正比。在这个高度放热的反应中，时空模式可以通过具有侧向加热的Bénard-Marangoni对流的稳定性分析来解释。
A bistable or excitable exothermic chemical reaction can produce a traveling front of chemical reactivity upon being triggered. The dynamics of the wave propagation are greatly influenced by the amount of heat generated at the wave front, which in turn is a function of (nonlinear) reaction kinetics, enthalpy change, and extent of reaction. The chemical reaction investigated here has shown complex propagative patterns, including accelerating big waves, convective rolls, double-diffusive convection, and spatiotemporal patterns. A model devised to explain the patterns involves a laterally heated fluid layer in which the basic flow loses stability in the form of hydrothermal waves. Wave motion is preceded by a global circulation between the hot and cold regions, with the velocity being proportional to the lateral temperature gradient. In this highly exothermic reaction the spatiotemporal patterns can be explained by a stability analysis of the Bénard-Marangoni convection with lateral heating.