Convection in an internally heated high Prandtl number fluid: a laboratory study
Convection in an internally heated high Prandtl number fluid: a laboratory study
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内部加热的高普朗特数流体中的对流：实验室研究
DOI：
10.1080/03091928508210081
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发表时间：
1985
影响因子：
1.3
通讯作者：
C. Carrigan
中科院分区：
文献类型：
--
作者：
C. Carrigan
摘要通过在受控条件下诱导特定的平面形状，首次研究了内部加热、高普朗特数、甘油基溶液中对流的稳定性机制。下六边形被发现是稳定的约40 Rac具有波数，这是在合理的协议与线性和有限振幅计算。超过这个值的瑞利数，细胞被观察到经历一个过渡，从流动向下流动的中心。这些新细胞大多数不是完全封闭的，与扭曲的卷有些相似。他们也被发现是时间依赖性和他们的水平尺度没有显着不同，在较低的瑞利数与六边形平面形状。然而，在大约125 Rac，双尺度流的开始被抑制，这一现象可能与上边界的有限热导率有关。
Abstract The stability regimes for convection in an internally heated, high Prandtl number, glycerin-based solution have been investigated for the first time by inducing particular planforms under controlled conditions. Down hexagons were found to be stable to about 40 Rac having wavenumbers which are in reasonable agreement with both linear and finite amplitude calculations. Beyond this value of the Rayleigh number, the cells were observed to undergo a transition from flow down to flow up at the center. Most of these new cells are not completely closed and bear some similarity to distorted rolls. They were also found to be time dependent and their horizontal scale did not differ substantially from that associated with the hexagonal planform at lower Rayleigh numbers. However, at about 125 Rac , the onset of two-scale flow was observed—a phenomenon which may be associated with the finite thermal conductivity of the upper boundary.