Plumes visualization by Light Induced Fluorescence in a rotating Rayleigh-Bénard convection EuHIT Funded Project

Team

Nicolas Rimbert
Université de Lorraine, Vandoeuvre-lès-Nancy, France
Olga Shishkina
German Aerospace Center (DLR), Goettingen, Germany
Dennis P.M. van Gils
University of Twente, Enschede, Netherlands

Overview

Research Infrastructure
Max Planck High-Turbulence Facility, Germany
Facilities used
High-pressure Convection Facility (GTF2)
Project leader
Denis Funfschilling
CNRS /Université de Strasbourg, Strasbourg, France

Abstract

Thermal plumes are of primary importance in turbulent Rayleigh-Bénard convection, since they carry most of the heat between the top and bottom boundary layers and are responsible for the origin of the large scale circulation of the fluid inside the convection cell. In experimental studies the plumes are usually identified by local temperature measurements using tiny thermistors, which provide incomplete information on the temperature distribution, or by using thermochromic liquid crystals, which are applicable only in a limited temperature range. In this project, we propose to use the new technique of Light Induced Fluorescence, in order to visualize the plumes. In particular, we will try to see the effect of the Ekman pumping on the plumes dynamics and the large scale circulation. The obtained experimental results will be compared with direct numerical simulations carried out for similar parameters of the fluid and convection cell.