Step 1: Materials
- Round wood for the base (It doesn't actually have to be round but I would recommend getting a piece of wood that is 1'' thick so you can cut pretty deep grooves with the Dremel)
- Clear Acrylic Pipes (I used one pipe with 6'' outer diameter and another with 4'' outer diameter)
- Piece of wood for the handle (I used the long darker piece of particle board that I found in a scrap pile but anything will do)
- Gorilla wood glue
- Silicone sealant (not pictured)
- Corn syrup
- Food Coloring
- Cups & Straw
- Drill with 4'' circular bit
- Hack Saw
If you have access to a laser cutter or a 3D printer I would recommend using those tools to create a much more precise base and handle for this apparatus. I am convinced that if I had a handle that I could have turned with out shaking the whole setup as much as I did then the final result would have came out better. That being said you can achieve pretty amazing results with the setup that I have here so if all you have is a drill or a Dremel don't be discouraged!
Step 2: Preparing the Base
To prepare the wood to be cut with a Dremel I traced the inside and outside of the pipe onto the wood with a pencil and then set the groove depth on the Dremel and proceeded to hallow out the outline. The nicer job that you do here the nicer the final product will look but as soon as the pipes fit you are free to stop.
Step 3: Cutting the Pipes
Taping the pipe with painters tape really helps you keep the cut straight.
Step 4: Sealing the Outside Pipe
Step 5: Preparing the Inner (spinning) Pipe and Its Handle
This will have to slide on and off of the apparatus because you will have to add the food coloring to the corn syrup without the handle on and then replace the handle and turn everything around... There is definitely room for further innovation here!
Step 6: Preparing the Corn Syrup
Be careful with corn syrup!!! It is very sticky can can easily cause a mess if you mishandle it.
Step 7: Performing the Demo
Once you have each of the three colored drops in place slowly turn the handle clock-wise 5 times. Then pause and turn the handle counter-clockwise 5 times. Hopefully if you didn't shake it too much you should see something pretty cool!! This seeming reversal is related to the viscosity of the corn syrup which creates a pretty low reynolds number allowing us to "reverse" the process. To learn more about this phenomena I would start with this wikipedia link.