DIY Leaf-Vacuum: Using Venturi Equations for Pressure Calculation

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Discussion Overview

The discussion revolves around the design and pressure calculations for a DIY leaf-vacuum utilizing a leaf-blower. Participants explore theoretical and practical aspects of the project, including the application of fluid dynamics principles.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant suggests using the Bernoulli equation for initial pressure estimates but emphasizes the need for actual measurements of static pressure or flow rate.
  • Another participant proposes the idea of pulling a vacuum on the leaf container with the blower's suction side to potentially increase flow.
  • A different contributor notes that vacuum cleaners and blowers typically have two connection points, questioning whether the project is for academic purposes or practical use.
  • It is mentioned that leaf blowers often provide advertised wind speeds, which could be used alongside Bernoulli's equation for calculations.
  • One participant expresses a preference for using a fan blade to handle leaves, indicating a shift away from building a vacuum system.

Areas of Agreement / Disagreement

Participants generally agree on the relevance of Bernoulli's equation and the need for specific measurements, but there are differing opinions on the best approach to constructing the leaf-vacuum, with no consensus on a single method.

Contextual Notes

Limitations include the lack of specific numerical values for pressure and flow rate, as well as the dependence on the definitions of terms like "vacuum" and "flow" in this context.

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I want to make a leaf-vacuum using a leaf-blower.
Does anyone know how I might calculate the pressures?
Thanks!
leaf.png
 
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The Bernoulli equation should get you started with estimates but you will eventually need some real numbers. Do you have a way to measure static pressure or flow rate?

Could you simply pull a vacuum on the leaf container with the suction side of the blower? You would get more flow that way.
 
Generally all vacuum cleaners/blowers have 2 points to connect the pipe. One for vacuum and one for blowing.
Do you want this for academic purposes or for actually using on leaves?

Like montoyas said, Bernoulli's equation will help you, but you need some numbers.
 
Last edited:
Leaf blowers often advertise their wind speed, so that and Bernoulli's equation is all you need.
 
Thanks, I think just letting the leaves go thru a fan blade is the best way to go, and for that, I would buy not build... Thanks again!
 

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