Traveling-wave convection with Eckhaus instability modulation in a binary fluid mixture
Traveling-wave convection with Eckhaus instability modulation in a binary fluid mixture
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DOI：
10.7498/aps.56.4742
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发表时间：
2007-08-01
影响因子：
1
通讯作者：
Huang Yong-Nian
中科院分区：
文献类型：
--
作者：
Li Guo-Dong;Huang Yong-Nian
对于二元流体混合物中的Rayleigh-Benard对流，通过全流体动力学方程的数值模拟，得到了矩形格子中时空位错缺陷周期性调制的行波态.研究表明，Eckhaus不稳定性触发的对流卷对的产生导致了这种调制。由于左壁滚转的产生频率小于右壁滚转的湮灭频率，系统很快就移出稳定区，在稳定和不稳定的Echkaus波数带之间来回振荡。并对传热和流体混合特性进行了研究.
For Rayleigh-Benard convection in a binary fluid mixture, we obtained a traveling-wave state with periodic modulation of spatiotemporal dislocation defects in a rectangular cell by the numerical simulation of full hydrodynamic equations. The investigations show that the creation of pairs of convective rolls triggered by Eckhaus instability leading to this modulation. Because the generating frequencies of rolls at the left wall smaller than the annihilating frequencies of rolls at the right wall, the system soon move out of the stable region, in this way the system oscillates back and forth between the stable and unstable Echkaus wave number band. The properties of heat transfer and fluid mixing also studied too.