Dresden 2020 – scientific programme

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VA: Fachverband Vakuumphysik und Vakuumtechnik

VA 2: Vacuum technology: New developments and applications

VA 2.2: Talk

Monday, March 16, 2020, 13:10–13:30, HSZ 301

Transient modelling of liquid ring vacuum pumps with mercury as working fluid — •Santiago Ochoa — KIT Karlsruhe, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen

For an application in fusion reactors, liquid ring pumps with mercury as working fluid are foreseen. This kind of pump is simple and robust in its design, but challenging in modelling: Reliable results - needed to design and optimize liquid ring pumps - can only be achieved if the geometry is modelled in full 3D, considering (turbulent) gas- and working fluid flows through the pump with simultaneous heat and mass transfer. This talk presents a modelling approach of liquid ring pumps with water and mercury as working fluid, using the software ANSYS CFX. In a first modelling step, 3D transient two-phase simulations have been performed using air as pumped gas and water as working fluid. Results will be presented for two different mesh resolutions and operating pressures. In a second step, mercury has been used as working fluid. In this case, it was much more difficult running the model and the computational needs were excessive. However, first results will be presented also here and lessons learned will be shown up.