the detailed diagnosis of the electron density distributions in the current-zero arcs. Hence, this has been an active area of research with early reports in 1980s for SF 6 gas arcs [10][11][12]. However, the electron density determination has been often conducted at only one position in the arcs and decaying arc phenomena have not been intensively examined based on the

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The present article describes numerical thermofluid simulation results on decaying arc behavior in 80%CO 2 + 10%O 2 + 10%C 5 F 10 O (C5-PFK) gas considering molecules constituted with more than 9 atoms in a nozzle space on the assumption of local thermodynamic equilibrium (LTE) condition. The gas mixture 80%CO 2 + 10%O 2 + 10%C 5 F 10 O (C5-PFK) is one of the candidate alternatives for SF 6 in a gas circuit breaker. First, we calculated 80%CO 2 + 10%O 2 + 10%C 5 F 10 O (C5-PFK) arc characteristics only by considering less than 8-atom molecules. However, it seems possible to produce more than nona-atomic molecules in the low-temperature region in 80%CO 2 + 10%O 2 + 10%C 5 F 10 O (C5-PFK) arcs. The present work further calculated the equilibrium composition of this gas mixture at 0.1 MPa with taking account more than nona-atomic molecules. Furthermore, their thermodynamic and transport properties were also computed with collision integrals between species considered. Using these properties, the arc temperature and gas flow fields were calculated using two-dimensional LTE model for a free recovery condition from dc 50 to 0 A. Results showed that a similar temperature decay was obtained for arcs in the 80%CO 2 + 10%O 2 + 10%C 5 F 10 O (C5-PFK) gas mixture to that for arcs in 100%CO 2 gas.

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