Convective and periodic motion driven by a chemical wave
Convective and periodic motion driven by a chemical wave
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DOI：
10.1063/1.1456023
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发表时间：
2002-04-01
影响因子：
4.4
通讯作者：
Yoshikawa, K
中科院分区：
文献类型：
--
作者：
Kitahata, H;Aihara, R;Yoshikawa, K
实验研究了化学波在毫米级BZ反应介质液滴中产生对流的过程。传播的化学波引起界面张力的瞬时增加，并且界面张力的这种局部变化引起对流。通过将界面张力的瞬时增加引入到与化学动力学方程耦合的修改后的Navier-Stokes方程中，用数值模拟再现了所观察到的流动剖面;修改后的Oregonator。我们还观察到BZ液滴在油相上的周期性运动。这种周期性运动归因于界面张力的节律性变化。所观察到的周期性对流运动与化学反应进行了讨论，在等温条件下的化学机械能转换。(C)2002年美国物理学会。
The generation of convective flow by a chemical wave was studied experimentally on a mm-sized droplet of Belousov-Zhabotinsky (BZ) reaction medium. A propagating chemical wave causes a transient increase in interfacial tension, and this local change in interfacial tension induces convection. The observed flow profile was reproduced with a numerical simulation by introducing the transient increase in interfacial tension to a modified Navier-Stokes equation coupled with a chemical kinetic equation; a modified Oregonator. We also observed the periodic motion of a BZ droplet floating on an oil phase. Such periodic motion is attributed to the rhythmic change in interfacial tension. The observed periodic convective motion coupled with a chemical reaction is discussed in relation to chemo-mechanical energy transduction under isothermal conditions. (C) 2002 American Institute of Physics.