Running the setup with corn starch is definitely more fun than watching the water! When mixing corn starch with water I found that a 2:1 cornstarch to...
After a brief foray into the realm of visualizing sound through fire I decided to head in the other direction and watch vibrations propagate through some different kinds of fluids. I used water and a corn starch solution to get what I thought were some pretty cool results.
- Speaker (That you don't intend to use again...)
- Driver for the speaker (I had one laying around but you can build your own, use a guitar amp, etc)
- Plastic lid that is about 4'' - 6'' in diameter with about a 1/2'' lip to contain the fluid
- Corn Starch
- Hot Glue Gun
- Wire strippers, electrical tape, etc.
- Clear Plastic wrap (this is optional but when using corn starch it can replace the lid and just cover the speaker for some cool results)
- Frequency generator (I just used a program called AudioTest that I downloaded to my computer)
Step 2: Preparing the Speaker
Essentially this device is just a lid glued to a speaker. This will allow the vibrations from the speaker to be transfered directly into whatever fluid is in the lid allowing us to observe patterns. The other part of the setup is wiring the speaker to the driver. This part of the process will differ depending on what setup you have but is should be pretty straight forward. I would recommend cutting wires long enough so that your speaker can sit on the table and be far enough to not splash any water on the sensitive electronics.
Step 3: Running the setup with water
To use this device simply pour water into the lid and play some sounds out of the speaker. If you play a slow sweeping wave you might be able to find out at which frequencies the fluid resonates as their will be a well defined pattern. The fun part of this is experimenting and changing up these frequencies to produce cool patterns in the water allowing you to visualize sound.