Onset of Convection in a Layer of Fluid Cooled from Above
Onset of Convection in a Layer of Fluid Cooled from Above
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从上方冷却的流体层中开始对流
DOI：
10.1063/1.1761108
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发表时间：
1965
影响因子：
4.6
通讯作者：
T. Foster
中科院分区：
文献类型：
--
作者：
T. Foster
在实验中，一层水通过蒸发从其顶部表面冷却。用红外辐射计测量了顶面温度。明显对流行为的开始是通过目测水层底部一层薄薄的墨水的运动来确定的。在观测精度范围内，实验表明，在较大的瑞利数下，流体表现对流行为所需的时间和对流表现时放大最大的扰动的水平波数与流体层的深度无关。
Experiments were performed in which a layer of water was cooled by evaporation from its top surface. The top surface temperature was measured using an infrared radiometer. The onset of manifest convective behavior was determined by visual observation of the motion of a thin layer of ink at the bottom of the water layer. Within the accuracy of the observations, the experiments show that at large Rayleigh numbers the time needed for the fluid to manifest convective behavior and the horizontal wavenumber of the disturbances amplified most at manifestation of convection are independent of the depth of the fluid layer.