Abstract
The mean free path of gaseous molecules was revised by introducing the tangential momentum accommodation coefficient. The effective viscosity coefficient equation was deduced. Based on Muijderman narrow groove theory, the performance parameters of gas film were calculated by the trial method for the spiral groove dry gas seal. It has been found that the leakage rate decreases and the opening force of the gas film increases with the increasing of the tangential momentum accommodation coefficient, and both of them change little when the tangential momentum accommodation coefficient is bigger than 0.4. Both of them increase with the increasing of rotating speed and spiral groove angle, and change little when the spiral groove angle is bigger than 20°. The leakage rate increases and the opening force decreases with the increasing of film thickness.
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