Knudsen pump

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This is the current revision of this page, as edited by 128.141.190.205 (talk) at 20:34, 24 March 2021 (Thermal transpiration causes gas molecules to flow from the warm to the cold chamber! The gas densities in the cold chamber is higher than in the hot chamber, as the cold gas does not move as fast and so does not escape as easily. The pressure on the other hand is lower in the cold chamber, as in thermal equilibrium the number of hits of molecules with the wall is the same in both chambers but the colder molecules have lower speed and thus exert lower force, i.e. lower pressure is measured.). The present address (URL) is a permanent link to this version.
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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

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  1. ↑ Gas pump made of minerals has no moving parts, PhysOrg.com
  2. ↑ Script error: No such module "Citation/CS1".

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