Can the x-section be calculated? Yes, using DIscrete Element Method (DEM) modeling. Granular dynamics, using DEM, can solve many such puzzling particle flow regimes. Some limitations are: a)model size in 2-D or 3-D with number of particles www.conveyor-dynamics.com (comminition side)

Lawrence Nordell

Conveyor Dynamics, Inc.

1111 West Holly St.

Bellingham, WA 98225 USA

ph 360/671-2200

fx 360/671-8450

email nordell@conveyor-dynamics.com■

During the late 50th and 60th. Prof. Jung, head of R&D from the former Steinmueller boiler manufacturing made a lot of investigations on rotating chutes. They use rotating chutes as feeding and dosing elements for bulk solids.

I´m shure to have some copies of his calculations (closed mathematical description with set of diff-eq.)in my stock.

If so, I´ll post some figures here.

Best regards

Klaus Schneider ■

For more informations please read:

1. Jung, R.: Die Hohlwelle als Schüttgutförderer. Forsch. Ing.-Wesen 25 (1959) 2 , S. 37-43

2. Jung, R.: Eigenschaften und Anwendungsmöglichkeiten des Schüttgut-Drehrohrzuteilers. Brennstoff-Wärme-Kraft 14 (1962) 12, S 593-600

3. Jung, R.: Der Drehrohrförderer. Maschinenmarkt 72 (1966) 101

The attached picture is part of 3.

Attachments

drehrohrförderer (JPG)

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Dear Mr. Nag

The determination of the motion of material in a rotating chute and the dischage trajectory is well suited to physical modelling. Movement in rotating vessels of many kinds is strongly dependent on the Froude Number of the system. This applies across a wide range of rotational speeds. Similarly, discharge trajectory can be scaled.

Requirements are chute geometry and rotational speed. Results are best for free flowing granular materials above 150 microns average diameter, but other materials can be simulated.

Please contact me if you would like to pursue this.

Regards,

Peter Donecker

http://www.oreflow.com ■