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Patent

Vortex de-aerator

W Stethem
TLDR
In a vortex type de-aerator, a vortex stabilizing baffle device is located adjacent to the inlet for stabilising the vortex flow and for shielding separated gas from any disturbances at the vortex inlet as discussed by the authors.
Abstract
In a vortex type de-aerator for separating air and other gases from a flowing liquid, having a central perforate tube located within a vessel having a tangential inlet and a tangential outlet, a vortex stabilising baffle device is located adjacent to the inlet for stabilising the vortex flow and for shielding separated gas from any disturbances at the inlet.

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Citations
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References
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Lubricating system for engines

TL;DR: In this article, the authors describe a method for separating entrapped gases or air which may be drawn by the oil scavenging pump from the engine prior to its return to the engine.