Re: Jatropha Seeds Bin And Hopper
410.6776 kg/cubic meter -- wow, thats a bit accurate 
410 will be accurate enough.
If you want a wall friction angle you can make your own tester.
A piece of plate to act as the wall surface, something to be a collar to contain the jatropha seeds (what are jatropha seeds???), some weights to press the jatropha seeds onto the plate and a spring balance to measure the load to push (or pull) the seeds over the plate. A bit crude, but better than guessing
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Jatropha seeds contains oil which will be processed for biodiesel...
dimensions are 1.85cm length, 1.14cm width, 0.90cm thickness.
So if I can get the data from that experiment what would be the next step? should I do multiple measurement in that tester? ■
Re: Jatropha Seeds Bin And Hopper
Dear Mr. vladimirdean,
It is not possible to describe the design procedure in such forum.
You will require to decide the material internal friction coefficient and friction coefficient between hopper wall and material.
The material internal friction coefficient can be decided by testing the material. Alternatively, you can take reference of DIN where they have given internal friction coefficient for quite a few number of materials.
You can compare your material with the listed material there and you can reasonably decide the internal friction coefficient of the material. You are doing only project where design procedure matters rather than the exact specific value. So, if you go by this consideration, you may take internal friction angle as approximately 90% of repose angle. The repose angle you can decide very easily.
As for the wall friction coefficient, based on DIN and other data its value for soyabean is 0.25 for plain and fairly even surface. Its value is 0.38 for surface of medium smoothness & evenness such as welded steel flush surface. These values for wheat are also as above.
Regarding the hopper wall angle etc. possibly you will be opting for steep angle category hopper to prevent residual material. If so there are formulae for calculation of its wall angle etc. If you are deciding about less steep hopper, there are also formulae for that.
You can refer to DIN specifications which are quite informative about the hopper design.
Regards,
Ishwar G Mulani.
Author of Book : Engineering Science and Application Design for Belt Conveyors.
Author of Book : Belt Feeder Design and Hopper Bin Silo
Advisor / Consultant for Bulk Material Handling System & Issues.
Pune, India.
Tel.: 0091 (0)20 25871916
Email: parimul@pn2.vsnl.net.in ■
Jatropha Seeds Bin and Hopper
good day,
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i'm a mechanical engineering student and i'm working on my design project, i am designing a bin and hopper for jatropha seeds, i have conducted an experiment about its density which is 410.6776 kg/cubic meter. now im stuck with the hopper angle and getting its discharge dimensions...i do researched on the formulas in getting the angle and dimensions but i dont have the apparatus in determining its angle of friction, etc., can anyone help me with this endeavor of mine...i really need the angle of my hopper, by the way its a wedge type.
in addition my main priority for now is a good assumption for the wall friction angle since i can use the jenike and johanson chart in plotting my hopper angle. i hope there's a design before similar with jatropha seeds that can be applied to my hopper design.
thank you very much for your replies...