Average fluid film pressure in mechanical seal applications-

Average fluid film pressure in mechanical seal applications

　2017-07-14　　

Average fluid film pressure in mechanical seal applications:

Average fluid film pressure: refers to the average pressure carried by the fluid film between the sealing end faces. which is

For parallel face seals, according to the Navier-Stokes equation, the fluid film static pressure formula of the built-in mechanical seal when the laminar flow pressure difference flows in the plane gap can be derived as

It can be seen from the formula that for incompressible liquids, the hydrostatic pressure is distributed along the radial direction of the sealing surface according to a logarithmic curve; for compressible gases, the hydrostatic pressure is distributed along the radial direction of the sealing surface according to a parabolic law.

For the wave face seal, according to the Reynolds equation, using the narrow seal approximation and cavitation boundary conditions, the fluid film pressure of the wave face liquid end face seal with n waves can be derived:

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