Temperature triggered large-scale stereoscopic PIV using HFSB and LED illumination for the investigation of mixed convection in multiple planes

Abstract

We present results from stereo PIV measurements conducted in turbulent mixed convection in a rectangular cell. The main goal of the investigation was to gain knowledge about flow reconfiguration processes which occur at a certain parameter range. For the measurements in the different cross-sections of the sample, a combination of HFSB seeding and a LED array as light source was used. Furthermore the flow reconfigurations occurred as isolated events which required a starting trigger obtained from simultaneous temperature measurements. First analyses show a connection between flow reconfigurations and significant changes in the temperature distribution.