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Viscous FloV Resistance
Free Molecular Flow Conductance
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100 microns Hg 80 F air 96 microns air at 80 annulus or passage average pressure channel combined conductance combined viscous conductances of pipes constant effective displacement cross sectional area D V S diameter of pipe diffusion pump elementary length entrance Let entrance to pipe f.m.f. conductance flov flow conductance formulas flow of gases flow resistance formulas formula 15 formula 21 Formula 34 formulas given found by formula free molecular flow ft/sec isothermal kind of flow length of pipe less than 2200 liters per sec liters per second low pressure limit lowest pressure mass rate mechanical pump molecular flow conductance negligible pressure and volumetric pressure drop pressure range range of pressure rate of flow rectangle rectangular duct rough evacuation roughing pump shown substitute temperature terms and units total conductance ua d4 values vessel viscous and free viscous flow conductance viscous flow resistance volumetric efficiency