Demonstration test rig: CO2 visual cell

To visualize the transition of CO2 from the two-phase region to the supercritical state, a demonstration test rig was designed and built at the IKE.

 

The test stand essentially consists of a visual cell, temperature and pressure sensors, on-site display devices, a measurement data acquisition system, a cryostat for temperature control of the visual cell, a camera for optical recording with different lenses (endocentric and telecentric lens) and light sources, as well as a computer.

 

Scheme of the demonstration test rig: CO2 visual cell,Institut für Kernenergetik und Energiesysteme, Universität Stuttgart

Scheme of the demonstration test rig: CO2 visual cell, 2020 © IKE

 

During the experiments, the visual cell is heated or cooled along the isochor line which runs through the critical point at a temperature of 30.98 °C and a pressure of 7.38 MPa.

 

T-s Diagram of CO2,Institut für Kernenergetik und Energiesysteme, Universität Stuttgart

T-s Diagram of CO2, 2020 © IKE

 

The first video shows the recording of a quasi-static experiment, using a telecentric lens, in which the viewing cell was cooled down from 36 °C to 28 °C in during 12 h.

Video 1, 2020 © IKE

 

Video 2 shows the recording with the same experimental boundary conditions, but using an endocentric lens.

Video 2, 2020 © IKE

 

Video 3 shows a dynamic experiment with the telecentric lens in which the viewing cell was also cooled from 36 °C to 28 °C during 30 min.

Video 3, 2020 © IKE

 

During the recording in video 4 the same experiment was performed with the endocentric lens.

Video 4, 2020 © IKE

 

This picture showsKonstantinos Theologou
M.Sc.

Konstantinos Theologou

Research Associate / Doctoral Candidate

This picture showsRainer Mertz
Dr.-Ing.

Rainer Mertz

Head of department EW and Safety Representative

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