Heat transfer through flowing media plays an important role in nature and technology. Convective heat flows are usually turbulent and three-dimensional and thus very difficult to characterize. Therefore, the time and location dependent velocity and temperature fields are investigated in model experiments, e.g. in Rayleigh-Bénard cells with the working fluids air, SF6, water and liquid metals. In this context, the flow and temperature fluctuations that are crucial for the turbulent heat flux are determined using non-contact methods such as laser Doppler anemometry (LDA), particle image velocimetry (PIV), ultrasonic Doppler velocimetry (UDV) and laser-induced fluorescence (LIF), as well as thermochromic liquid crystals (TLC). The results of the model investigations are used, among other things, for the validation of numerical simulations (CFD).

Main research topics

  • Investigation of near-wall transport and structure formation processes in turbulent Rayleigh-Bénard flows
  • Investigation of the fine structure of turbulent thermal boundary layers and coherent structures in large-scale convection flows
  • Investigation of room air flows with mixed convection
  • Numerical and experimental investigations of heat transport processes

Range of services

  • experimental validation of numerical flow simulation (CFD)
  • calibration of velocity sensors in the flow channel
  • model investigations in the wind and water channel
  • Numerical and experimental investigations of heat transport processes
  • Flow and temperature measurements in air and water

Laboratory equipment/test rigs

  • Rayleigh-Bénard cells for high Rayleigh numbers and high aspect ratios (water)
  • Wind tunnel (30 m/s)
  • Water channel (5 m/s)