2. Compressible fluid flow
The aim of this chapter is to present the different flow regimes that can occur between the faces of a mechanical seal when it is operating with a compressible fluid.
2.1 Phase diagram
A pure body can generally be presented in three different states: solid, liquid and gas. We will confine ourselves to the case of fluids, i.e. liquid and gas. In a pressure-temperature diagram, the liquid and gas phases are separated by a line called the saturation curve (red line on figure 3 ). The curve ends at a so-called critical point, beyond which there is no difference between the liquid and gaseous states
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Compressible fluid flow
Low-pressure gas sealing
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