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FLOW WAVES INDUCED BY CHEMICAL WAVE TRAINS TRAINS AND DYNAMIC BEHAVIOR OF SURFACE DEFORMATION WAVES

化学波列诱发的流动波与表面变形波的动力行为

基本信息

批准号：
11837013
负责人：
HIDETOSHI Miike
金额：
$ 2.18万
依托单位：
Yamaguchi University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11837013/
关键词：
BZ (Belousov-Zhabotinskv) Reaction Chemical Reaction Waves Reaction-Diffusion System Spiral Waves Flow Waves Oscillatory Flow Marangoni Convection Surface Deformation 振動対流流体現象表面変形

项目摘要

Belousov-Zhabotinsky (BZ) reaction is known as a typical example of the system under non-equilibrium and open conditions. Self-organizations such as spiral structures and target patterns observed in the system have been understood by modeling the pattern dynamics with reaction-diffusion mechanism. We have found convection flows induced in the solution layer exciting chemical waves. They are oscillatory flow associated with the spiral waves and developed convection associated with the accelerating chemical waves (bim waves). In this study, we carried out both experimental and theoretical approaches to understand the curious phenomena such as flow waves appeared in the chemical wave trains. It was pointed out that not only the Marangoni instability associated with the respective chemical wave trains but also a global distribution of reactants and/or catalysts are effective to bring the surface tension driven convection. New findings are1) Outgoing flow waves are observed in a reactor having a large diameter (more than 15 cm) under the excitation of chemical spiral waves,2) The flow waves change their pattern shape from target to spiral. The spiral flow waves (having wavelength 60mm, rotation period 40s, and propagation velocity 1500μm/s) are rotating in the underlying pattern of chemical spiral waves (having wavelenth 1.0mm, rotation period 20s, and propagation velocity 100μm/s).3) Taking the distribution gradients of catalysts and reactants into account numerical experiments are carried out. We observed two curious dynamics of periodic instability in the chemical waves and periodic change in the convection structure.The above results have been reported at an international conference on "Dynamic Aspects of Complex Systems from Cell to Brain (2000.11 : Sendai, Japan)". Especially, a mechanistic explanation of the new findings will be presented in the international conference on Marangoni convection to be held in Germany (Giessen : 2001.9).

Belousov-Zhabotinsky (BZ) 反应被认为是非平衡和开放条件下系统的典型例子。通过使用反应扩散机制对模式动力学进行建模，可以理解系统中观察到的自组织，例如螺旋结构和目标模式。我们发现溶液层中引起的对流会激发化学波。它们是与螺旋波相关的振荡流，以及与加速化学波（bim 波）相关的发展的对流。在这项研究中，我们采用了实验和理论方法来理解化学波列中出现的奇怪现象，例如流动波。有人指出，不仅与各自的化学波列相关的马兰戈尼不稳定性，而且反应物和/或催化剂的全局分布也能有效地带来表面张力驱动的对流。新发现是：1）在化学螺旋波的激发下，在大直径（大于15厘米）的反应器中观察到流出的流波，2）流波的图案形状从目标变为螺旋。螺旋流波（波长60mm，旋转周期40s，传播速度1500μm/s）在化学螺旋波（波长1.0mm，旋转周期20s，传播速度100μm/s）的基础上旋转。3）考虑催化剂和反应物的分布梯度进行数值实验。我们观察到化学波的周期性不稳定性和对流结构的周期性变化的两个奇怪的动力学。上述结果已在“从细胞到大脑的复杂系统的动态方面（2000.11：日本仙台）”国际会议上报告。特别是，对新发现的机械解释将在德国举行的马兰戈尼对流国际会议上提出（Giessen：2001.9）。