Projects

DFG - Experimental investigation of coupled MHD and radiation effects in Rayleigh-Bénard convection.

Rayleigh-Bénard convection (RBK) is a classical model experiment for the study of convection flows and natural heat transport processes. The project aims to perform fundamental experimental investigations of flow and heat transport behavior in RBK, which is influenced by the combined effects of thermal radiation and magnetic fields. The results will contribute to a better understanding of thermal energy systems operating at high temperatures and with electrically conductive fluids. The stated goal of the studies is to determine the functional relationship of convective heat transport and the resulting flow structures in terms of the Nusselt number and the Reynolds number as a function of the control parameters Rayleigh number (thermal forcing), Planck number (thermal radiation) and Hartmann number (magnetic field influence). The transition from laminar to turbulent and the transition to the ultimate regime also play an important role. With respect to relevant engineering applications, the found relationships serve, among others, to avoid critical fluid mechanical and thermal states in high temperature energy storage systems and liquid metal batteries.

Funding source:

DFG

Partner:

Dalian University of Technology, Prof. Benwen Li, School of Energy and Power Engineering.

DLR Institute of Technical Thermodynamics, Prof. André Thess, Stuttgart.

Helmholtz-Zentrum Dresden-Rossendorf, Dr. Sven Eckert, Department of Magnetohydrodynamics.

Researcher:

  • Prof. Dr.-Ing. Christian Karcher (project leader)
  • Prof. Dr.-Ing. Christian Cierpka (Project leader)
  • Dr. rer. nat. Christian Resagk (project consultant)
  • Prof. rer. nat. Yuri Kolesnikov (project consultant)
  • Jasmin Calmbach (project assistant)

CSC - Numerical simulation of convective transport processes affected by thermal radiation and external magnetic fields

The present project aims to conduct numerical simulations of fluid flow and heat transfer in thermal convection influenced by the combined effects of thermal radiation and electromagnetic fields. Hence, this project is the theoretical supplementary part to the experimental investigations within the respective DFG project. Here, already available and validated in-house codes for thermal convection under the influence of magnetic fields and for thermal convection influenced by thermal radiation will be further developed to include the coupled effects of both. The work will include the implementation of the Radiative Transport Equation (RTE) and the quasi-static Magnetohydrodynamics model into the existing solvers. Such simulations especially in turbulent flows require massive computational resources since dense matrices have to be frequently inverted and integro-differential equations have to be solved.

Funding source:

CSC (Chinese Scholar Council)

Partner:

Dalian University of Technology, Prof. Benwen Li, School of Energy and Power Engineering.

TU Ilmenau, PD Dr. rer. nat. Thomas Boeck, Institut für Thermo- und Fluiddynamik

Researcher:      

  • Prof. Dr.-Ing. Christian Karcher (Projektleiter)
  • Prof. Benwen Li (Projektleiter)
  • Panxin Li (Projektmitarbeiterin)