The dynamic characteristics of the annular pressure seal employed in pumps have been theoretically deduced with consideration for the effect of eccentricity of rotor. Turbulent flow is assumed in both circumferential and axial directions, and effect of inertia of the fluid is considered. An equation for the pressure increment due to journal translation is derived in terms of the effective viscosities, based on the rotational and axial flow Reynolds numbers. Comparisons are made between the stiffness, damping and add mass coefficients derived herein and the previousely published theoretical and experimental results without eccentricity. It is shown that the numerically obtained value is in reasonable agreement with experiment.
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