Vacuum Conductance Molecular Flow Calculator
High-vacuum systems engineering: Calculate molecular flow conductance ($C$) through cylindrical pipes, Clausing transmission probabilities ($\alpha_c$), aperture conductance, and effective pumping speed.
Vacuum Duct Geometry
Standard ISO-K / CF flanges
L = 0 for pure orifice aperture
Pumping Speed at Duct Exit
Turbomolecular or diffusion pump rating
Conductance & Effective Pumping Output
Tube Conductance C:
--
Liters / second (L/s)
Effective Pumping Speed S_eff:
--
L/s at chamber port
Clausing Factor:
--
transmission prob α_c
Aperture C_ap:
--
L/s (orifice limit)
Pumping Speed Loss:
--
% lost to piping
Gas Kinetic Velocities & Ratios
Mean Thermal Molecular Velocity $\bar{v}$:
--
Tube Aspect Ratio $L / d$:
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