Evaporative losses of vacuum-compatible oils through labyrinth seals

Details Evaporative losses of vacuum-compatible oils through labyrinth seals Evaporative losses of vacuum-compatible oils through labyrinth seals

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.524..265a&link_type=abstract

In: Proceedings of the 10th European Space Mechanisms and Tribology Symposium, 24-26 September 2003, San Sebastián, Spain. Compi

Computer Science

Tribology

Scientific paper

Following a literature review to assess the theoretical and experimental methods used to evaluate fluid losses via labyrinth seals, an experimental programme was carried out to measure these losses. A model derived by ESTL provided the best correlation with experimental oil losses and an effusion cell approach was identified as the most appropriate method to assess the effectiveness of labyrinth seals for three space oils, ie Krytox 143AC, Nye 186B and Nye 2001A. The selection of these fluids enabled a relatively wide range of vapour pressures to be investigated in the experimental programme using effusion cells of different geometries. The test results were compared with the ESTL oil evaporation model and it was found that the evaporative losses from Nye 186B and HVAC25/9 were within an order of magnitude of predictions. Losses from Nye 2001a were larger than predictions.

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