Building a Venturi to Collect Hazelnuts

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SUMMARY

This discussion focuses on the construction of a Venturi system specifically designed for collecting hazelnuts from the ground. The participants emphasize the necessity of a hosepipe with a minimum cross-section of 100mm and a length of 10 meters. Key considerations include the design of the bottom pipe to optimize airflow and pressure differences, with suggestions to angle the pipe to enhance efficiency. The discussion references the principles of fluid dynamics as outlined in the Wikipedia article on eductor-jet pumps.

PREREQUISITES
  • Understanding of fluid dynamics principles
  • Familiarity with Venturi effect applications
  • Basic mechanical engineering concepts
  • Knowledge of airflow dynamics in piping systems
NEXT STEPS
  • Research the design and calculations for Venturi tubes
  • Explore airflow optimization techniques in piping systems
  • Study the effects of pipe angles on fluid velocity
  • Investigate the use of eductor-jet pumps for similar applications
USEFUL FOR

This discussion is beneficial for mechanical engineers, DIY enthusiasts, and agricultural innovators interested in designing efficient systems for collecting nuts or similar applications.

pigwiddeon
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Hi all,

We are trying to build a venturi and I have got a couple of questions. I am not an engineer actually, and I am working together with 2 mechanical engineers who graduated and forgot everything long time ago :)

We are trying to build this venturi to collect hazelnuts from the ground. I don't think we have built the best we can do, so I thought maybe you guys can help me.

The hosepipe has to have at least 100mm crossection and 10 meters length. This is the only "must" we have.

You can check out the drawing and understand it better.

attachment.php?attachmentid=62826&stc=1&d=1381605441.jpg


The hosepipe is the one on the right side. The fan is blowing from the bottom pipe and forces the air goes left which eventually creates a pressure difference. How can I do the math of this thing? I thought of giving an angle to the bottom pipe, because I think air loses its speed when it has an exact "T" shape.

Some ideas? I would be grateful if you help me.

I don't think I could explain very well; but hope you will understand.
 

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