Hi there!
Today I want to show you an invention what I've made few weeks ago.
I call it:
Thermo-Flute
The name is came from two words:
thermoacoustics / pan flute
The base of the experiment is very simple.
A standing wave thermoacoustic engine (also called Hofler tube).
This tube has no moving parts.
The tube works as a quarter wavelength resonator like the Sondhauss tube
but it has a cold and a hot heat exchangers and a stack regenerator between them.
The strong temperature gradient across the stack regenerator creates a thermodinamic cycle
of oscillating air that produce sound.
How do these Hofler tube generate sound? - demonstration from Naval postgraduate school
This small thermoacoustic sound source was invented by Professor Tom Hofler
around 2000.
The sound intensity changes with the temperature difference.
Higher temperature difference gives higher amplitude for the sound.
It means the engine could also make sound if the hot and cold heat exchangers changing place.
So we can also make a flute with deep freezing.
In my invention the resonator length could be variable quickly in time
with opened tuned holes as the flute works.
My thermoacoustic flute has 5 notes only: E-D-C-A-G
This is a part of a mixolid - pentatonic scale if I'm right.
The engine has limits yet, and the ThermoFlute is a bit out of tune on the video
because the temperature changed a bit when I shoot this video,
but anyway this is the first working model what I've made
and I need to develop it
as a "just for fun" project in the future.
If you want to build your own Thermoacoustic Flute
just follow my YOUTUBE channel, SUBSCRIBE and HIT THE BELL button to advice.
Here is the short video how I play on the world first thermoacoustic flute: