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demonstrations:3_oscillations_and_waves:sound_waves:rubens_tube:start [2019/02/14 23:33]
127.0.0.1 external edit
demonstrations:3_oscillations_and_waves:sound_waves:rubens_tube:start [2020/02/14 17:17] (current)
demoroom
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 ====== Ruben'​s Tube ====== ====== Ruben'​s Tube ======
  
-{{tag>flame fire ruben'​s tube needs_review untagged unlocated}}+{{tag> ​propane ​fire standing_waves oscillations_and_waves acoustics located}}
  
 <WRAP box right> <WRAP box right>
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 ===== Description ===== ===== Description =====
  
-Flaming Sound Wave!! ​   Classes Used: PHYS 101PHYS 153 +A 1.5m long aluminum tube with approximately 80 holes drilled in the top at regular intervals. One end of the tube has a fitting for attachment to a standard barbecue propane tankwhile the other end has a brass membrane (to seal it) with a speaker mounted. ​
- +
- +
- +
  
 ===== Purpose ===== ===== Purpose =====
  
- +The Ruben'​s tube provides an exciting, flaming representation of a standing ​wave. There are about 80 holes along this tube, which are ignited once the tube is filled with gas. A speaker ​is fitted on one end and frequencies that create standing waves are played into the tube. The standing wave sets up areas where the static pressure is higherincreasing ​the flow rate and therefore ​the height of the flame at different points along the tube.  ​
-The Ruben'​s tube provides an exciting, flaming representation of a sound wave. There are about 80 holes along this tube, which are ignited once the tube is filled with gas. A speaker ​sits at one end and frequencies that create standing waves are played into the tube. The standing wave puts pressure on the gasreleasing different amounts through each hole causing ​the flame heights to vary.    +
-Now turn the function generator to the correct frequency and turn up the volume. Repeat for other wavelengths.  ​ +
- +
  
 ===== Apparatus ===== ===== Apparatus =====
  
- +  * Flame tube 
-Flame tube, propane ​tank (20 lb), function generator, receiver ​  +  * Propane ​tank (20 lb)  
- +  * [[demonstrations:​9_equipment:​oscilliscopes_and_function_generators:function_generator:​start|Function ​generator]]  
-Set up      +  * [[demonstrations:​9_equipment:​av_receiver_amplifier:​start|AV ​amplifier]]
-Attach the function ​generator ​output to the input at the back of the stereo labeled "Phono Right" +
-Ensure the stereo is set to play the Phono input +
-Attach the two cables from the back of the stereo to the receiver/amplifier ​and then to the speaker on the Ruben'​s Tube +
-Select a frequency and test the speaker  +
-Select one of the frequencies provided on the piece of paper taped on top of the function generator  +
-Attach tube to propane cylinder at the other end +
-Attach propane cylinder to tank +
-First turn on the tank, then turn on the propane to the tube +
-After a few seconds light the gas at the holes, some flames my go out during the demo and will need to be re-lit +
- +
- +
  
 ===== Setup ===== ===== Setup =====
  
 +  - Attach the function generator output to the input at the back of the stereo labeled "Phono Right" and ensure the stereo is set to play the Phono input
 +  - Attach the two cables from the back of the stereo to the receiver/​amplifier and then to the speaker on the Ruben'​s Tube.
 +  - Select a frequency on the function generator, set the amplifier volume to the minimum, and turn the function generator on. Then slowly turn the amplifier volume up to test that the speaker is connected properly.
 +  - Attach the propane tank to the flame tube using the tube and fitting on the end.
 +  - Open the valve on the propane tank all the way, then open the valve on the flame tube.
 +  - After a few seconds, begin trying to light the propane coming out of the holes. It'll take some time for the air inside the flame tube to be evacuated and replaced with propane.
 +  - Once all the holes have lit flames above them, adjust the height of the flame using the valve on the tube. Setting the height of the flames so that just a little bit of the yellow part of the flame is visible seems to produce the best contrast. You may have to adjust the flames later in the demo.
 +  - Finally, use the speaker and the amplifier as before to set up standing waves in the tube. A listing of some frequencies that work well is provided below.
  
 +===== Notes =====
  
-===== Notes =====+If the volume is too low, you'll find that it's hard to see much of an effect. If the volume is set too high, the flames in the troughs of the standing wave may go out. The volume needed to achieve a good effect may also vary depending on the mode of the standing wave.
  
-Music can be played into the tube for effect. Classical music or music with a lot of bass works best. As well, any piece of music with a lot of pure tones has good visual effect. Music can be provided. ​  +Music can be played into the tube for dramatic ​effect. Classical music or music with a lot of bass works best. As well, any piece of music with a lot of pure tones has good visual effect. Music can be provided. ​  
  
 Due to the flammable nature of this demo, please request assistance. ​ Frequencies of standing waves are recorded on the function generator. Significant volume is required to reach a visible amplitude.  ​ Due to the flammable nature of this demo, please request assistance. ​ Frequencies of standing waves are recorded on the function generator. Significant volume is required to reach a visible amplitude.  ​
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 f7: 400 Hz  f7: 400 Hz 
 f9: 514.5 Hz  f9: 514.5 Hz 
-Updated on: 06/20/13 
  
 <WRAP group> <WRAP group>
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 </​WRAP>​ </​WRAP>​
 <WRAP tablewidth 100%> <WRAP tablewidth 100%>
-| **Location** | ---- |+| **Location** | S2 |
 | **Maker** | Unknown | | **Maker** | Unknown |
 | **Current State** | Working | | **Current State** | Working |
demonstrations/3_oscillations_and_waves/sound_waves/rubens_tube/start.1550187203.txt.gz · Last modified: 2019/02/14 23:33 by 127.0.0.1