Active control of a global thermocapillary instability
Active control of a global thermocapillary instability
复制标题
主动控制全局热毛细管不稳定性
DOI：
10.1063/1.1497375
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发表时间：
2002
影响因子：
4.6
通讯作者：
G. Amberg
中科院分区：
文献类型：
--
作者：
J. Shiomi;G. Amberg
对充有硅油的圆柱形开口容器中的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。这是Shiomi等人先前工作的延伸，Shiomi等人通过使用通过简单算法反馈的不同位置处的局部温度信号在单个位置处局部加热表面来应用比例反馈控制。虽然探测到振荡显著减弱，但如果实现全球稳定，仍存在不确定性。在本文中，两个传感器/加热器对安装，以实现全局抑制的振荡。成功的全局稳定的振荡实现了范围内的Marangoni数，在弱非线性政权的最佳性能。使用可靠的温度测量方法，进行定量分析以量化控制的性能。确定了传感器/加热器对的增益和相对位置的最佳值。
Active control was applied to oscillatory thermocapillary flow in an open cylindrical container filled with Silicone oil. Thermocapillary convection was driven by imposing a radial temperature gradient on a flat free surface. This is an extension of the previous work by Shiomi et al. who applied proportional feedback control by locally heating the surface at a single position using the local temperature signal at a different position fed back through a simple algorithm. Although significant attenuation of the oscillation was detected, an uncertainty remained if global stabilization was achieved. In the present paper, two sensor/heater pairs were installed to achieve the global suppression of the oscillation. Successful global stabilization of the oscillation was achieved in a range of Marangoni number, with the best performance in the weakly nonlinear regime. Using a reliable temperature measurement method, quantitative analysis is carried out to quantify the performance of the control. The optimal values of gain and relative position of sensor/heater pairs were identified.