Billiard Balls In A Real World
Hi Author,
Discrete Element Method [DEMs] shows billiard balls moving on a flat screen presentation of a 3D bulk-product flow simulation. But do we really need a VDU screen presentation to show the movement of billiard balls?
The flow of coarse lumped particles is one of the simplest of bulk-product flow applications. Real product carries with it fines and respirable dust. Does the DEM help to identify fugitive dust issues? What about product segregation at the discharge pulley - do all the particles follow the same primary and internal flow trajectory? Plate friction can play a significant role in separating fines out of a flow stream inside a chute. And some product will even stick to a vertical face, or reverse incline. Does DEM warn us about that? Or are fines ignores, and the model only applicable to theoretically ideal non-cohesive granular product?
Is the product flow Newtonian? Mini-venturi effects in the flow stream can have significant effects on the amount of fugitive dust generated. What does the DEM tell us about performance in the field?
If DEM does not include aerodynamics, what exactly are we looking at? Is it a realistic prediction, or a Disney cartoon?
Regards - Sgt John.Rz
www.latviantourists.com.au / Open Book Club / Files / Bionic Research Institute ■
Re: Dem Conveyor Transfer Chute Design Software
Interesting
1) can I download a working evaluation version?
2) how much does it cost? ■
Re: Dem Conveyor Transfer Chute Design Software
Can't do dust dynamics without gas dynamics.
Ask if the code has gas?
Can it do non-billard balls? Maybe odd-balls?
How many balls can it play? A million or more?
What ratio of size distribution (large:small) does the code do? 2;1, 10:1 or maybe 20:1? Less is less.
Can it do adhesion and cohesion? Agglomeration? Breakage?
Can it mistrack belts? Can it produce wear attrition on metal and other surfaces? Can it do moving surfaces?
Some codes can do all of the above. I would bow to their excellence if they can do it all and more. Any less is a cackle.
John: let them walk and show they can run. DEM has been around for +30 years with thousands of publications. Maybe they have something new. Let them speak with authority. ■
Re: Dem Conveyor Transfer Chute Design Software
>>How many balls can it play? A million or more?
I dunno, Larry, I can easily play 10^15 particles an hour. Can you? ■
Re: Dem Conveyor Transfer Chute Design Software
I've tried to master the Helix pipeflow program, without any success. I've seen conveyors designed with the conveyor program & thought "how the ...?" Blowed if I'd fork out for this one from my own pocket.
Several CFD packages address 2 phase flow to some extent. If there is going to be a full scale assault on chute problems (I've yet to experience 'chute problems' you put a box round it and let it go, if it wears out replace it, what's the big deal, its coal and rock; not parrot eggs!) if there's going to be a full scale...let the big software houses do it..they know whether there's a market or not. ■
John Gateley johngateley@hotmail.com www.the-credible-bulk.com
Re: Dem Conveyor Transfer Chute Design Software
Dear Peter,
I would hope your performance claims of computing a quadrillion particles per hour are not indicitive of all your technology. Or are you only claiming to 3-D visualize this number through a peep hole of the odd particle and not the holistic picture? Engineers do not make good politicians. Fog is unbecoming.
The heavy lifting is in the rheological contact computations on large diameter ratios of many particle sizes and shapes. Are you a heavy lifter.
No word on the 11 major points? ■
Re: Dem Conveyor Transfer Chute Design Software
Dear Larry
I didn't make any claims of computing a quadrillion particles an hour.
My point is that physical scale modelling can process, by its analog nature, a huge number of particles in an hour.
I am wondering if perhaps you have got the wrong Peter? I'm not the one involved in software development. ■
Re: Dem Conveyor Transfer Chute Design Software
Yer right Peter D. I thought you were Peter B. Got to seeing those quadrillion particles, and had to wonder if it was more gas than solid.
I do get the point and analog reference. ■
Bulk Flow Analyst Software
Dear Bulkolics,
I did a training of Bulk Flow Analyst software and I'd like to talk with other peoples that know how to operate the program and obtain it a best results analisys.
I work at Tenova Takraf Brazil and we have a big project for to calculate next mouths.
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Re: Dem Conveyor Transfer Chute Design Software
For all those interested in the design of transfer chutes I suggest you read the paper that I wrote that is now in the technical papers section of the Forum together with Peter Donecker's addendum and comments, click here:
https://forum.bulk-online.com/showth...r-chute-design
Cheers
Colin Benjamin
Gulf Conveyor Systems Pty Ltd
www.conveyorsystemstechnology.com ■
Re: Dem Conveyor Transfer Chute Design Software
Originally Posted by Nivea Pacheco
I did a training of Bulk Flow Analyst software and I'd like to talk with other peoples that know how to operate the program and obtain it a best results analisys.
I work at Tenova Takraf Brazil and we have a big project for to calculate next mouths.
Nivea
I am a certified trainer for Bulk Flow Analyst by Applied DEM and therefore very familiar with the software. If you have any questions about the software please contact my email below and I will be glad to help you out.
Gary ■
Gary Blenkhorn
President - Bulk Handlng Technology Inc.
Email: garyblenkhorn@gmail.com
Linkedin Profile: http://www.linkedin.com/in/gary-blenkhorn-6286954b
Offering Conveyor Design Services, Conveyor Transfer Design Services and SolidWorks Design Services for equipment layouts.
DEM Conveyor Transfer Chute Design Software
New DEM Conveyor Transfer Chute Design Software
Helix Technologies, a leading developer of belt conveyor design software based in Perth, Australia, recently released a new Conveyor Transfer Chute design program.
The program uses the Discrete Element Method, called DEM, to calculate and simulate the path a bulk material follows through a transfer chute.
The DEM method is gaining international acceptance as a realistic way to predict the flow of a bulk material, and coupled with the increase in computing power delivered by standard desktop PC’s, this method is now at the forefront of technology.
DEM particle flow technologies are the subject of research at many institutions including the CSIRO in Australia and Universities around the world.
Traditionally, transfer chutes were designed b relying on experience because analytical calculations can only be applied to the first part of the chute such as the parabolic discharge trajectory. What happens to the material flow after it leaves the pulley and impacts a chute wall is not easy to determine and engineers have had to rely on past experience and trial and error. In some cases, scale models of the transfer are built and tested before a final design can be adopted and this physical modeling is time consuming and expensive.
Helix Technologies identified a need for a practical, easy to use program that can allow engineers to design transfer chutes quickly and easily using their standard computer. This meant that the software must be capable of running as a stand-alone program without the need for special 3rd party software or special supercomputers.
Helix Technologies proceeded to couple their in-house technical programming capabilities and experience with the latest Visual Studio C# .Net Microsoft Windows® development tools to produce a stand-alone program which allows the user to draw the transfer chute, perform the very intensive DEM calculations, view the results in real time as the calculations proceed and even make a Windows Media Player .avi movie all within the Helix program.
This complete solution in one package is unique, but the program also allows integration with other design tools such as CAD drafting programs, although these are optional.
The program uses OpenGL graphics coupled to DEM calculations and 3D Vector geometry developed entirely in-house to provide the materials handling design engineer with a complete design tool for transfer chutes. The engineer can draw the chute in the program and then watch the flow paths as the material flows through the chute. Adjustments to the chute geometry can made in the Helix DEM program and the new flow paths observed, allowing for optimization of the design in a very quick time.
The Helix DEM method tracks the path of each individual particle as it collides with other particles, chute impact plates and liner faces and moving conveyor belts and pulleys.
The program has been verified by site observations on actual transfer chutes in both the Coal and Iron ore industries in Australia at very large port and ship loading operations. The Helix DEM program predicts the actual flow paths observed on-site and has even been used to simulate chute blockages observed in practice.
Helix Technologies’ research and development of conveyor design software began in 1992. The company’s software is used by thousands of engineers in more than 25 countries around the world and this new Helix DEM Chute Design Program is the culmination of intensive software development by the company. DEM Movie simulations of typical conveyor transfer chutes can be seen on the Helix website and a demonstration trial program is also available from the Helix website.
For more information, please visit:
https://edir.bulk-online.com/profile...chnologies.htm
Fig:
Helix DEM Transfer Chute Design program screenshot
Attachments
helix_chute (JPG)
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