Author Topic: Resonant Cavities: Bells and Whistles  (Read 3281 times)

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Resonant Cavities: Bells and Whistles
« on: November 03, 2010, 03:35:16 am »
I have an extensive background in music and musical instruments that spans over 30 years as a practicing professional musician. As any working musician can tell you, the required equipment to perform on a regular basis has a tendency to break down all too often during the most opportunistic times. Pre-amps, power-amps, cables, lights, effects, wireless, you name it, we have used it and broke it. Instrument repair on the go is often exercised when needed too. You never know when  bad things will happen, but, you can bet your bottom dollar they will. I have never worked a night in my life without a technicle difficulty. Those were the good ol' days...

Let's take a look at resonant cavities and the different designs and functions they posses. Bells and whistles are the two basic types we generally deal with when constructing water fuel cells and electrolyzers. The bell is an instrument that is struck with a mallet of any sort, enabling us to set the mass into a vibrating oscillation, causing tones to sound. Examples of bells are, wind chimes, tuning forks, rocks, drums, xylophones, etc. Note that some bell designs also incorporate a shape much like a whistle which works somewhat different than a bell. Certain shapes and materials can be utilized to take advantage of natural amplification. Styrofoam is a natural amplifier, hollow shapes(resonant cavities) are also natural amplifiers and so on. Whistles, on the other hand, are not struck, but, blown through with ambient air. The tones produced are a result of air pressure and shape of mass(resonant cavity) the air is being pushed through. Horns and wind instruments fall into this category. The resonant cavity of a whistle vibrates much less than a bell, although, it is the air itself that goes into oscillation or "resonant action". In general, the smaller the cavity the higher the pitch. Note that a whistles also has a resonant frequency the same as a bell where the "resonant action" frequency matches that of the cavities bell type resonance causing the mass to vibrate like a bell in unison with the air.

Through research of my own, it has become apparent to me the "resonant cavity" Stan describes in his works is not much more than an electric whistle, so to say. Even in a typical tubed cell, the gasses move through the cavity very much like a horn or whistle. There is also a certain amount of magnetohydrodynamics happening that helps to move water and gasses push through the cavity, although, not enough to make the pressure required for resonant action. In other words, in order for a resonant water fuel cell to work, the medium will have to be pumped through the cavity and not just submerged in a bath of water. The only way to hear a whistle is to blow through it. Ever try to blow a horn or whistle under water?

From the wiki...
Quote
Whistle physics:The whistle works by causing the smooth flow of air to be split by a narrow blade, sometimes called a fipple, creating a turbulent vortex which causes the air to vibrate. By attaching a resonant   chamber to the basic whistle, it may be tuned to a particular note and   made louder. The length of the chamber typically defines the resonance frequency. A whistle may also contain a small light ball, usually called the pea, which rattles around inside, creating a chaotic vibrato effect that intensifies the sound. Japanese bird whistles use several small balls and are half filled with water in order to reproduce the sound of a bird song.  A steam whistle works the same way, but using steam as a source of   pressure: such whistles can produce extremely high sound intensities.
Sometimes, unintentional whistles can be set up. A common one is the opened sunroof of a car:   air passing over the top of the vehicle can, at certain speeds, strike   the back edge of the sunroof, creating a very low frequency whistle   which is resonated by the closed interior of the car. Since the sound   frequency is infrasonic, around 4 Hz, the effect is very uncomfortable for occupants, who feel the vibration rather than hear it. Such low frequencies can induce nausea, headache, disorientation and dizziness.   The effect can be prevented by opening a side window a few inches.   Subsonic whistles have also been developed for use as non-lethal   area-denial weapons for crowd control purposes, or to deliberately   create a sense of uneasiness in an enemy.[citation needed]

As stated above, steam can be used for a medium to be driven through a whistle. Why not liquid water? If water and gasses can be set into resonant action, driving it through a resonant cavity will be required. It is my belief that the injector type WFC systems Stan developed relates to these types of acoustic physics. It is my intention to replicate at least to a certain degree, the injector system Stan Meyer had used to power his dune buggy. I feel very confident with the information I have acquired over the years to make this a success. I have yet a bit to learn about laser LED's and the effects of light with water and gasses. I have a gut feeling, to make this work correctly without premature discharge of the fuel mixture at such high voltages(20Kv-50Kv), the laser priming stages have to be present.

I have seen Hardkrome's injector recently and it has given me inspiration to build. If your reading this Hardkrome, chime in and let us know how we can all build such nice things. If my budget allows it, I would gladly pay a shop to build for me too. I still have so much to learn! How do you connect a pressurized line to the injector? I will need three lines into one injector possibly. One for water, one for air, and one for exhaust recirculation.

Bubz

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Re: Resonant Cavities: Bells and Whistles
« Reply #1 on: November 03, 2010, 16:43:51 pm »
I like everything you said.