Molecule movement on the surface of stainless steel vacuum pump is called migration. Gas molecules in thermal state run from one part of space to the other, migrating physical quantities from high concentration to low concentration until the physical quantities reach uniform distribution. Gas diffusion, viscosity and heat conduction of stainless steel vacuum pump belong to migration phenomenon. Look at the following specific introduction:
1. Diffusion
The movement of gas in another medium due to concentration gradient is called diffusion. Medium can be another gas (diffusion in this case is called interdiffusion) or a condensable substance.
In stainless steel vacuum pumps, helium penetrates through glass up to 10-13 liters per second. Hydrogen can penetrate through iron at 300-400 C, nickel at 450 C, glass at 600 C and copper at 640 C. Diffusion coefficient. The ratio of the absolute mass flow rate per unit area to the normal concentration gradient per unit area is obtained. Diffusion has been widely used in practical technology such as diffusion pump and surface physics.
2. Viscosity and heat conduction of gases
In any medium, the transfer of momentum and the exchange of momentum between layers are called the viscous properties of this medium. The ratio of tangential force to velocity gradient per unit area in the direction of airflow velocity gradient is a viscous coefficient.
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