# Thread: Profile of Bulk Material Flowing from a Rotating Chute

1. Join Date
Oct 01
Posts
2
Is there any mathematical formulation available for determination of profile at any cross-section of flowing materials along a rotating chute?

2. MATERIALHANDLING Guest
Dear Mr Nag
could you pl. elaborate more on your query regarding rotating chute: is the chute rotating and what is the profile of the material discharged, is it vertical or inclined.
regards
satwinder

3. Join Date
Oct 01
Posts
2
Dear Mr Satwinder
Yes you are right...the chute is rotating with a known RPM about a fixed vertical axis.The inclination angle of the chute can be varied from 17 deg to 53 deg.Chute is of length 3 m and it`s shape is semi cylindrical.Idea is to predict the falling trajectory of the material from the chute and the spread of the material for a known initial velocity of the material when it reach the chute.At the same time the profile of the material in the chute.

4. ## Flow in Rotating Chute

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

5. 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

Last edited by Schneider; 9th November 2002 at 16:20.

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.

7. 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.

Regards,

Peter Donecker

http://www.oreflow.com