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3B22.u1 - Gas Pipe or Rubens Flame Tube

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​3B22.u1 - Gas Pipe or Rubens Flame Tube

Preview
SelectSelected
Title3B22.u1 - Gas Pipe or Rubens Flame Tube
Objective

Demonstrate standing waves due to the propagation of sound waves in a closed tube filled with gas.

StatusAvailable
Assembly Instructions

Instructions
A five-foot long, one and a half-inch diameter pipe is closed at one end and has a polyethylene diaphragm and a horn driver across the other. The pipe is fed with natural gas which escapes from a row of small holes along the top edge of the pipe. When it is lit, a row of small flames forms. If the pipe is now driven at one of its natural frequencies, a standing wave is set up in the gas which varies the gas velocity/density and consequently varies the amount of gas being fed to the flames and is directly proportional to the relative position of the standing wave in the pipe to the exit holes of the gas. Thus, the flames no longer burn with the same length of flame, but with a sinusoidally modulated envelope.

DO NOT USE THE RADIO SHACK AMPLIFIER

Setup Time15
Operation Time
Preview Time
Operation Instructions

Operation Steps
1   845
2   945
3   1100
4   1272
5   1425
6   1570
7   1785
8   1960

ExportableNo
Demo on DimeNo
PIRA 200Yes
Export Instructions (if different)
HazardsNone
Analysis/Information
Category3 Oscillations
Subcategory3B - Wave Motion
Keywordstransverse wave, resonance, Rubens flame tube, Rubens'
Construction Information
 
  
  
gas pipe flame tube - 5.5' long, 5" wide
1
lighter
1
function generator and amplifier - pasco digital
1
audio driver - Peavey, 8-ohm, mounted on aluminum base
1
banana cable
2
gas tube holder
1
natural gas hook-up