Bernoulli's Law Experiment Using Water

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We made this expiriment that demonstrates Bernoulli's law for a course at the TU Delft.
It demonstrates water rising to different heights caused by difference in the water velocity.

Step 1: Materials and Tools

Materials

  • Multiple clear plastic hoses (diameter of ± 6 mm, total length of ± 1 m)
  • Large water hose (diameter of ± 1.3cm, length of ± 1m)
  • Small plank of wood (30 x 40 cm)
  • 2 buckets
  • Bilge pump
  • 3D print (you can make this yourself or use ours)

Tools

  • 3D printer
  • Pliers
  • Hand saw
  • Drill
  • Hot glue gun

Not many have direct acces to a 3D printer so this might help you find one near you which you can use!

Step 2: Getting the 3D Print

First of all, you can choose to either design your own print in tinkercad for example or use ours.

Once your design is complete you can download the .stl file and transfer it to the 3D printer's software programme.
A couple of recommended settings:

  • The infill should be 100% in order to prevent leaks in the design.
  • Enabling support material, without this the design will collapse.

After the printing is finished, this takes quite a while, you will need to remove the support material using pliers, the easiest way to do this is to grab and twist. Next up is glueing the parts together with hot glue, make sure to cover up all the edges to prevent leakage. As you can see in the picture, we still need some pratice :)
Now your print should be ready for usage!

Step 3: Assembly

If you haven't already, glue the thin clear hoses to the 3d print using the holes in the print. Next up is attaching the print to the wooden plank, this can again be done with hot glue however this isn't very effective unless you sand both first (lightly).
We put some lines on the wood to make it easier to compare the water levels, but this is completely optional but it does help aligning the hoses so they can be hot glued at the same height.
Now there are only a couple things left to do, we'll start with the bucket, a hole should be drilled just above the base to connect the print, this hole should have a diameter of 1.3 cm. In this the print can be attached and in order to make it water tight a little glue should be used around the edges.
Almost there, lets set up the experiment.

Step 4: Testing

Now that you have all components, we can start setting things up!
First of all you are going to need a table or somthing elavated. This can be used to put the construction on. The other end of the print should face the ground in order for the water to fall into the second bucket in which the pump is situated. This pump will run the water back through the hose into the first bucket for a continous process.
An important detail is that one should first fill up the print with water for the desired effect. The easiest way to do this is to hold your thumb on the loose end of the print when filling the first bucket up, after the water level starts rising in the hoses you can let loose. Now you should see Bernoulli's law in action!

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