Fertigation with venturi suction. IN 1" - OUT 1"
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The venturi suction allows to extract a liquid from a vessel and distribute it mixed with the main fluid.
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This is a device designed for efficiently mixing two liquids.
Leveraging the Venturi effect, it creates a vacuum suction from the little inlet, that draws one liquid into a high-velocity stream of the other, resulting in a rapid mixing without the need for mechanical agitation.
This method is useful in fertigation to distribute specific substances on the grass or vegetable garden making it ideal for sensitive liquids (and void hand contact).
The arrow on the device surface indicates the flow direction.
To increase fluid flow rate, the following modifications were implemented from Rev01 to Rev02:
- Nozzle lenght reduction (from 7.8mm to 5mm);
- Body to nozzle clearance increased (from 1.6mm to 2.5mm);
- Main inlet internal slope modification to have a less sudden diameter decrease from 20mm to 2.4mm, which causes fluid energy dissipation.
Tests carried out on the two revisions:
Design Rev01:
| Time [s] | aspirated fluid weight [g] | main water weight [g] | water flow rate [L/s] | fluid flow rate [L/s] | Water/fluid ratio |
| 69 | 1015 | 3998 | 0.0579 | 0.0147 | 3.94 |
| 48 | 1084 | 4044 | 0.0843 | 0.0226 | 3.73 |
Design Rev02:
| Time [s] | aspirated fluid weight [g] | main water weight [g] | water flow rate [L/s] | fluid flow rate [L/s] | Water/fluid ratio |
| 66 | 1355 | 3494 | 0.0529 | 0.0205 | 2.58 |
| 50 | 1336 | 3508 | 0.0702 | 0.0267 | 2.63 |
| 52 | 1328 | 3444 | 0.0662 | 0.0255 | 2.59 |
| 54 | 1441 | 3581 | 0.0663 | 0.0267 | 2.49 |
| 47 | 1323 | 3294 | 0.0701 | 0.0281 | 2.49 |
Future tests will investigate the effect of horizontal printing on fluid friction reduction. It should increase the water speed and consequently the reduction of pression on the little inlet, according to the Bernulli law.