The TOPFLOW (Transient TwO Phase FLOW Test Facility) thermal-hydraulic experimental facilities are used to investigate thermal-hydraulic phenomena under realistic operating conditions. Experiments are conducted in industry-relevant geometries representative of chemical process engineering as well as conventional and nuclear energy systems. The research activities include air–water and steam–water flow investigations, flash evaporation of refrigerants in the TERESA facility, and experiments with supercritical CO₂ in the CARBOSOLA loop.

Through the development, construction, and operation of this test facility, componen­ts will be tested, and generic experiments will be conducted to obtain data for the modeling and simulation of flows and heat transport in sCO₂.

In the TERESA experimental facility, fluid dynamic aspects of thermal se­paration columns for critical material systems are reproduced. Featuring a refrigerant cycle process with 3M™Novec™649, flash evaporation and vapor-liquid phase interaction can be studied in se­paration-effective internals at low surface tensions and viscosities and variable vapor-liquid density differences.