Molecular Diffusivity Effects on Mixing in a Diffusively-Stable, Turbulent Flow

分子扩散率对扩散稳定湍流中混合的影响

• 批准号: 9977208
• 负责人: Chris Rehmann
• 金额: $ 16.7万
• 依托单位: University of Illinois at Urbana-Champaign
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-01-01 至 2003-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9977208&HistoricalAwards=false
• 关键词: Molecular; Diffusivity; Effects; Mixing; Diffusively

9977208RehmannThis laboratory study will examine the effect of the order of magnitude difference between the molecular diffusivities of heat and salt on the transport of the latter quantities by turbulence. The focus will be on turbulence in stratified flows that are not unstable to double-diffusive instabilities. Motivation for this study comes from field observations and numerical modeling results which suggest that in some types of turbulent flow there is differential transport of heat and salt. The laboratory experiments will provide a more controlled environment and more comprehensive observations than can be achieved in the field. The importance of understanding the degree to which differential transport of heat and salt occurs lies in the role that these transports play in determining the density stratification of the ocean and consequently the large-scale climatological transport of heat by the ocean.

9977208湍流实验室研究将检查热量和盐的分子扩散率之间的数量级差异对湍流传输后者数量的影响。 重点将放在分层流动中的湍流上，这种湍流对双扩散不稳定性来说并不稳定。 这项研究的动机来自现场观察和数值模拟结果表明，在某些类型的湍流有热和盐的差分传输。 实验室实验将提供比实地实验更可控的环境和更全面的观测。 了解热量和盐的差异输送发生的程度的重要性在于，这些输送在确定海洋的密度分层，从而确定海洋的大规模气候学热量输送方面发挥的作用。