Effect of modulation on the onset of thermal convection
Effect of modulation on the onset of thermal convection
复制标题
调制对热对流开始的影响
DOI：
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发表时间：
1969
影响因子：
3.7
通讯作者：
G. Venezian
中科院分区：
文献类型：
--
作者：
G. Venezian
从下面加热的水平流体层的稳定性，除了层壁之间的稳定温差外，还对壁面温度施加随时间变化的正弦扰动。只考虑了无穷小的扰动。振荡温度场的影响是通过对外加场振幅的幂次进行微扰展开来处理的。计算临界瑞利数的位移作为频率的函数，发现可以通过壁面温度的时间调制来提前或延迟对流的开始。
The stability of a horizontal layer of fluid heated from below is examined when, in addition to a steady temperature difference between the walls of the layer, a time-dependent sinusoidal perturbation is applied to the wall temperatures. Only infinitesimal disturbances are considered. The effects of the oscillating temperature field are treated by a perturbation expansion in powers of the amplitude of the applied field. The shift in the critical Rayleigh number is calculated as a function of frequency, and it is found that it is possible to advance or delay the onset of convection by time modulation of the wall temperatures.