ANN's Daily Aero-Term (06.18.14): Phase Separation – Aviation Fuel | Aero-News Network
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Wed, Jun 18, 2014

ANN's Daily Aero-Term (06.18.14): Phase Separation – Aviation Fuel

Aero-Terms!

Aero-Terms are designed to be a daily reminder of the terms, names, acronyms and explanations of the unique language that populates the aviation world. Aerospace, sport aviation, fixed wing, helo, you name it... it's all fair game.

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Phase Separation – Aviation Fuel

Phase separation is when a combined liquid separates into two different liquids and may occur when autogas used for aviation fuel.

When alcohol present in autogas, it is subject to phase separation, when the fuel is cooled as a result of the aircraft’s climbing to higher altitude. Think of an oil and vinegar salad dressing; when the dressing is shaken, the oil and vinegar combine. As the salad dressing sits, the oil and vinegar separate. A similar situation exists when autogas with ethanol is combined with water. The presence of ethanol in autogas allows an amount of water to be absorbed, rather than remaining separate.

FMI: http://aviationglossary.com/phase-separation-aviation-fuel/

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