Knudsenstrom

The transition from viscous flow to molecular flow is called Knudsen flow . It prevails in the fine vacuum area (10 ⁻³ to 1 mbar). The free path of the particles is then comparable to the diameter of the line, i.e. the Knudsen number about 1.

The product of pressure p and pipe diameter d for a certain gas at a certain temperature can also serve as a characteristic variable for the various types of flow.

literature

1. ↑ Max Wutz, Hermann Adam, Wilhelm Walcher: Theory and practice of vacuum technology . 5th edition. Vieweg, Braunschweig 1992, ISBN 3-528-34884-4 , pp. 76-78 .