JOURNAL ARTICLE
论振荡型对流
Year: 1982 Journal: Science in China Series B-Chemistry Biological Agricultural Medical & Earth Sciences (in Chinese) Vol: 12 (8)Pages: 758-768 Publisher: Science China Press
Abstract
本文用Euler分析和Lagrange分析相结合的方法,从理论上研究了下部加热的旋转流体中的振荡型对流. 既分析了两个自由边界面的情况也讨论了一个自由边界面和一个刚性边界面的情况. 振荡型对流的物理本质是旋转流体中热扩散本身的双重作用. 热扩散通常仅减小流体元的浮力,但当旋转速度足够大而粘性消耗很小时,热交换可交替地导致流体元的过度冷却和过度加热,从而对不稳定产生一种净的正反馈机制. 由于Ekman抽吸所产生的次级流场影响,在刚性边界面附近,流体质点将不像在自由边界面附近那样有水平漂移,并逐渐深入流体内部,而是逐渐螺旋地移向刚性边界面;并且其垂直速度落后于内层垂直速度约1/4周期. 文中还探讨了振荡性不稳定模的空间平均能量关系. 并用过稳定性对流概念解释了实验模拟中发现的、在加热青藏高原模型上空周期性出现的涡旋.
Keywords:
Materials science
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