Experimental study of near-wall transport and structures in turbulent Rayleigh-Bénard convection

湍流瑞利-贝纳德对流中近壁输运和结构的实验研究

• 批准号: 320396053
• 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: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/320396053?language=en
• 关键词: Experimental; study; near; wall; transport

The heat transfer between a solid body and a surrounding fluid is a major process in many natural and technical flows. This physical process is studied experimentally in the so-called Barrel of Ilmenau - a large-scale Rayleigh-Benard experiment with a height of eight Meters and a diameter of seven Meters. Since Ludwig Prandtls work on the convective heat transfer, it is well known that the convective heat transfer coeffialpha cient \in the relation Q_k=\alpha A \Delta T (Q_k - convective heat flux, A - area, \Delta T - temperature difference between the solid body and the fluid) depends on the local velocity field adjacent to the surface of the solid body. The characterization of this velocity field is the central objective in the actual project RB-1 within the DFG Research group FOR 1182. Using 3d Laser Doppler velocimetry, simultaneous temperature and velocity measurements at single points and measurements of the planar velocity field using 2D2C Particle Image velocimetry, we found that the velocity field adjacent to the heated (cooled) surface is extremely complex and strongly three-dimensional. Hence, a comprehensive characterization requires a volumetric velocity measurement.

在许多天然和技术流中，固体和周围流体之间的热传递是一个主要过程。在Ilmenau的所谓枪管中对这种物理过程进行了研究 - 一个大型雷利 - 贝纳德实验，高度为8米，直径为7米。 Since Ludwig Prandtls work on the convective heat transfer, it is well known that the convective heat transfer coeffialpha cient \in the relation Q_k=\alpha A \Delta T (Q_k - convective heat flux, A - area, \Delta T - temperature difference between the solid body and the fluid) depends on the local velocity field adjacent to the surface of the solid body. The characterization of this velocity field is the central objective in the actual project RB-1 within the DFG Research group FOR 1182. Using 3d Laser Doppler velocimetry, simultaneous temperature and velocity measurements at single points and measurements of the planar velocity field using 2D2C Particle Image velocimetry, we found that the velocity field adjacent to the heated (cooled) surface is extremely complex and强烈的三维。因此，全面的表征需要进行体积的速度测量。

项目成果

A local sensor for joint temperature and velocity measurements in turbulent flows.

• DOI: 10.1063/1.4989430
• 发表时间: 2018-01
• 期刊: The Review of scientific instruments
• 作者: J. Salort;E. Rusaouën;L. Robert;R. du Puits;Alice Loesch;O. Pirotte;P. Roche;B. Castaing;F. Chillà