Knudsen pump

The Knudsen pump also referred to as "thermal transpiration pump" or "Knudsen compressor" is a gas pump that utilizes no moving parts. Instead it uses thermal transpiration, the phenomenon that gas molecules drift from the hot end to the cold end of a narrow channel. Thus a hot vacuum chamber "transpires" into the cold chamber. This thermal transpiration flow is induced when the boundary walls of the pump have a temperature gradient. Because the pump is based simply on temperature differences and has no moving parts, it could provide reliable and precise control of gas flow for a variety of applications, such as gas-sensing breath analyzers, chemical weapons detectors,[1] and in satellite control.[2] It is named after Martin Knudsen, a Danish physicist.

## References

1. ↑ Gas pump made of minerals has no moving parts, PhysOrg.com
2. ↑ Kataoa, Takeshi; Tsutahara, Michihisa; Ogawa, Kazuhiko; Yamamoto, Yoshifumi; Shoji, Masakazu; Sakai, Yoshihide (2004). "Knudsen Pump and Its Possibility of Application to Satellite Control". Theoretical and Applied Mechanics Japan 53: 155-162. doi:10.11345/nctam.53.155. https://www.jstage.jst.go.jp/article/nctam/53/0/53_0_155/_pdf.

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