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SAE AIR1168/1A

Superseded

Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

View Superseded by

Thermodynamics of Incompressible and Compressible Fluid Flow

Available format(s)

Hardcopy , PDF

Superseded date

25-02-2025

Superseded by

SAE AIR1168/1B

Language(s)

English

Published date

11-04-2019

The fluid flow treated in this section is isothermal, subsonic, and incompressible.

DocumentType
Standard
Pages
156
PublisherName
SAE International
Status
Superseded
SupersededBy
Supersedes

The fluid flow treated in this section is isothermal, subsonic, and incompressible. The effects of heat addition, work on the fluid, variation in sonic velocity, and changes in elevation are neglected. An incompressible fluid is one in which a change in pressure causes no resulting change in fluid density. The assumption that liquids are incompressible introduces no appreciable error in calculations, but the assumption that a gas is incompressible introduces an error of a magnitude that is dependent on the fluid velocity and on the loss coefficient of the particular duct section or piece of equipment. Fig. 1A-1 shows the error in pressure drop resulting from assuming that air is incompressible.With reasonably small loss coefficients and the accuracy that is usually required in most calculations, compressible fluids may be treated as incompressible for velocities less than Mach 0.2. At higher velocities and for large loss coefficients (Kt and 4fL/D), compressible flow analysis should be used.

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