Dear Mr Amit Segev.

Can we start (or agree) on the following definitions.

-Suspension velocity (also floating velocity)

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Free fall velocity of a product particle in a gas under given gas conditions.

or:

Upward gas velocity under given gas conditions that creates an upward force on the product particle equal to its weight.

F.i. Soy bean 12 m/sec in air at 0 degr.C and 1 bar(absolute).

- Choking velocity

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The gas velocity, when lowered from a conveying velocity, whereby the pipeline gets choked and the pneumatic conveying stops.

- Saltation velocity

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The gas velocity, when lowered from a fully conveying gas velocity, the product starts to settle along the bottom of a horizontal pipeline.

The question still remains, whether these velocities are calculated with or without the presence of material.

As the gas conditions along the pipeline vary with pressure and temperature, the corresponding suspension, choking and saltation gas velocity values also vary.

Choking and saltation velocity are related to the gas velocity profile in the pipe (boundary layer) and the suspension velocity at the considered location along the pipeline.

Awaiting better definitions

teus ■