Dresden 2017 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 16: Focus: Fundamental aspects of turbulent convection

DY 16.10: Vortrag

Dienstag, 21. März 2017, 12:30–12:45, ZEU 118

Horizontal velocity fields in square large aspect ratio turbulent convection cells: comparison between experiment and simulation — •Christian Kästner, Anastasiya Kolchinskaya, Christian Resagk, and Jörg Schumacher — Institute of Thermodynamics and Fluid Mechanics, Technische Universität Ilmenau, Postfach 100565, 98684 Ilmenau

We report a one-to-one comparison of an experimental and numerical analysis of turbulent velocity fields in a square Rayleigh-Bénard convection cell at an aspect ratio ten and air as working fluid. Horizontal cuts through the convective flow were obtained from planar particle image velocimetry (PIV) measurements. Optical access for laser light sheet and PIV camera was provided by transparent side-walls and a transparent heating plate. The application of a transparent heating plate, a glass plate coated with a transparent and electrically conductive metal oxide (TCO), allowed first time experimental observation of horizontal velocity fields in turbulent thermal convection at large aspect ratios. The horizontal cuts were taken in mid-plane of the convection cell and below the cooling plate at a Rayleigh number Ra= 500,000. Numerical and experimental results show good agreement and provide new insights into large-scale coherent flow pattern formation in turbulent thermal convection.