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双扩散对流中台阶结构的实验研究

万伟 屈玲 周生启

万伟, 屈玲, 周生启. 双扩散对流中台阶结构的实验研究[J]. 力学学报, 2014, 46(2): 217-223. doi: 10.6052/0459-1879-13-230
引用本文: 万伟, 屈玲, 周生启. 双扩散对流中台阶结构的实验研究[J]. 力学学报, 2014, 46(2): 217-223. doi: 10.6052/0459-1879-13-230
Wan Wei, Qu Ling, Zhou Shengqi. LABORATORY STUDIES ON THE STAIRCASE STRUCTURE OF DOUBLE-DIFFUSIVE CONVECTION[J]. Chinese Journal of Theoretical and Applied Mechanics, 2014, 46(2): 217-223. doi: 10.6052/0459-1879-13-230
Citation: Wan Wei, Qu Ling, Zhou Shengqi. LABORATORY STUDIES ON THE STAIRCASE STRUCTURE OF DOUBLE-DIFFUSIVE CONVECTION[J]. Chinese Journal of Theoretical and Applied Mechanics, 2014, 46(2): 217-223. doi: 10.6052/0459-1879-13-230

双扩散对流中台阶结构的实验研究

doi: 10.6052/0459-1879-13-230
基金项目: 国家自然科学基金(41176027,11072253);广东省自然科学基金(10251030101000000)和国家重点基础研究发展计划(2010CB950302)资助项目.
详细信息
    作者简介:

    周生启,研究员,主要研究方向:深海动力学过程、海洋中小尺度过程、海洋环流和海洋混合、湍流热对流. E-mail:sqzhou@scsio.ac.cn

  • 中图分类号: P731

LABORATORY STUDIES ON THE STAIRCASE STRUCTURE OF DOUBLE-DIFFUSIVE CONVECTION

Funds: The project was supported by the National Natural Science Foundation of China (41176027,11072253), the Natural Science Foundation of Guangdong (10251030101000000) and the National Basic Research Program of China (2010CB950302).
  • 摘要: 线性层结的盐水系统在底部加热和顶部冷却时,会产生明显的温盐台阶结构,这是双扩散对流现象. 温盐台阶由界面和混合层组成. 温度垂向廓线的变化可以反映台阶的生成与合并. 根据盐水系统上下边界之间温差的变化,系统演化过程分为两个阶段. 在温差增加阶段,主要发现在已有台阶顶部生成新台阶,而最下层台阶与其上层台阶发生合并过程. 在此阶段,由于台阶的生成速率大于合并速率,系统内台阶越来越多. 在温差减小阶段,系统仅存在台阶的合并过程,因此台阶数目越来越少. 最后,系统内仅存在一个大尺度环流. 同时,发现台阶的生成与合并过程虽然发生在局部区域,但会影响到系统的其他区域. 例如,由于最下层台阶的合并,系统下边界的温度梯度发生明显变化. 实验中,由于最下层台阶不断与其上层台阶合并,最下层台阶厚度比其他台阶厚度大,而其他台阶厚度变化不大. 最下层台阶厚度(h)随时间(τ)的变化满足h~τ0.7 的关系.

     

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出版历程
  • 收稿日期:  2013-07-11
  • 修回日期:  2013-09-17
  • 刊出日期:  2014-03-18

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