Active control of oscillatory thermocapillary convection.
Active control of oscillatory thermocapillary convection.
复制标题
振荡热毛细管对流的主动控制。
DOI：
10.1103/physreve.64.031205
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
H. Alfredsson
中科院分区：
文献类型：
--
作者：
J. Shiomi;G. Amberg;H. Alfredsson
在填充硅油的开口圆柱形容器中，对振荡热毛细流动进行了主动控制。热毛细对流是通过在平坦的自由表面上施加径向温度梯度来驱动的。该控制器通过简单的算法，利用不同位置的局部温度信号反馈，对单个位置的表面进行局部加热。在超临界Marangoni数的宽范围内实现了振荡的显着衰减，在弱非线性政权的最佳性能。同时测量两个位置的温度振荡，使我们能够很好地了解控制如何影响自由表面上的整个温度场。定量分析，以表征最佳的反馈放大和所需的功率。
Active control of oscillatory thermocapillary flow was applied in an open cylindrical container filled with silicone oil. Thermocapillary convection was driven by imposing a radial temperature gradient on a flat free surface. The control was realized by locally heating the surface at a single position using the local temperature signal at a different position fed back through a simple algorithm. Significant attenuation of the oscillation was achieved in a wide range of supercritical Marangoni numbers, with the best performance in the weakly non-linear regime. Simultaneously measuring the temperature oscillation at two positions gives us a good insight in how the control influences the whole temperature field on the free surface. Quantitative analysis was done to characterize the optimal feedback amplification and the required power.