The behavior of seal-ring in the shaft seal which operates on oil film to seal high pressure gas is studied. The experiment on the 60 cm diameter seal-ring shows the slow whirl phenomenon, i.e., the local oil film thickness and that temperature varies with the period of about 100 seconds. The analytical model is formulated and predicts the oval deformation of seal-ring due to hot spots, and that the oval shape rotates slowly but periodically according to the shift of hot spots. Theoretical predictions are confirmed to agree well with the experiment. Also, the effects of some design parameters are described to prevent the relevant slow whirl.

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