Local heat flux in turbulent Rayleigh-Bénard convection

湍流瑞利-贝纳德对流中的局部热通量

• 批准号: 188379410
• 负责人: Privatdozent Dr.-Ing. Ronald du Puits
• 金额: --
• 依托单位: Fachgebiet Aerodynamik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/188379410?language=en
• 关键词: Local; heat; flux; turbulent; Rayleigh

Climate prediction and weather forecast, the propagation of pollutants in the atmosphere and the oceans as well as an efficient heating or cooling of indoor rooms are essentially based on numerical models in which a great variety of physical and chemical processes has to be considered. Thermal convection is one of these factors. However, its simulation in highly turbulent flows is still very uncertain nowadays. The applicant intend to study turbulent heat transport up to a Rayleigh number of Ra=10^12 in the world-wide largest convection experiment - the Barrel of Ilmenau. Using both local heat flux probes and infrared camera technology the distribution and the temporal evolution of the local heat flux will be measured in the Rayleigh-Bénard cell of 7.15 m diameter. In particular, it will be studied systematically how this distribution depends on the aspect ratio - the ratio between the lateral and the vertical extent of the cell. It is to be shown whether or not local deviations from the mean heat flux may occur as provided in phenomenological scaling theories.

气候预测和天气预报、污染物在大气和海洋中的传播以及室内房间的有效加热或冷却基本上都是基于数值模型，其中必须考虑各种物理和化学过程。热对流是这些因素之一。然而，它在高湍流流动中的模拟目前仍然很不确定。申请人打算在世界上最大的对流实验--伊尔梅瑙桶中研究瑞利数Ra=10^12的湍流热传输。利用局部热通量探测器和红外照相机技术，将在直径为7.15米的瑞利-贝纳德池中测量局部热通量的分布和时间演变。特别是，它将系统地研究这种分布如何取决于纵横比-细胞的横向和垂直范围之间的比率。这是要表明是否从平均热通量的局部偏差可能会发生提供的唯象标度理论。

项目成果

Error estimation of temperature measurements in non-isothermal shear layers

• DOI: 10.1007/s00348-012-1271-y
• 发表时间: 2012-02
• 期刊: Experiments in Fluids
• 影响因子: 2.4
• 作者: R. Kaiser;R. du Puits

Local wall heat flux in confined thermal convection

受限热对流中的局部壁热通量

• DOI: 10.1016/j.ijheatmasstransfer.2014.02.033
• 发表时间: 2014
• 期刊: International Journal of Heat and Mass Transfer
• 影响因子: 5.2
• 作者: Robert Kaiser;Ronald du Puits
• 通讯作者: Ronald du Puits