Control of Rayleigh-Bénard convection in a small aspect ratio container
Control of Rayleigh-Bénard convection in a small aspect ratio container
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小纵横比容器中瑞利-贝纳德对流的控制
DOI：
10.1016/0017-9310(96)00174-3
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发表时间：
1997
影响因子：
5.2
通讯作者：
L. Howle
中科院分区：
文献类型：
--
作者：
L. Howle
本文通过扰动热边界条件，对小展弦比水平层流中的Rayleigh-Bénard对流进行了主动控制。这些实验使用一种新的阴影系统来测量高普朗特数流体从无运动状态的偏离。比例控制方案使用阴影信息作为反馈来确定下边界热流分布。单独控制的加热器阵列施加加热分布。对流振幅的显着抑制是可能的，至少10倍的临界瑞利数。这种对流控制方法为磁对流抑制提供了一种经济的替代方案。
Active control of Rayleigh-Bénard convection in small aspect ratio horizontal layer, by perturbation of the lower thermal boundary condition, is shown. These experiments use a novel shadowgraphic system to measure the departure of a high Prandtl number fluid from the no-motion state. A proportional control scheme uses the shadowgraphic information as feedback to determine the lower boundary heat flux distribution. An array of individually controlled heaters imposes the heating distribution. Significant suppression of the convection amplitude is possible to at least 10 times the critical Rayleigh number. This convection control method provides an economical alternative to magnetic convection suppression.