Differences between revisions 1 and 14 (spanning 13 versions)
⇤ ← Revision 1 as of 2009-10-21 16:22:53 →
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← Revision 14 as of 2009-11-05 21:17:07 → ⇥
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Editor: srnarf
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Deletions are marked like this. Additions are marked like this.
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(attachment photo showing the fully set up demonstration) attachment:TD4B40_10-01a.jpg
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Insert description of apparatus, its component, what it is demonstrating. Radiative Heat Transfer, locally known as Light the Match.

Two large parabolic reflectors, 12 inches in diameter, one with a "white tipped" stick match at it's focus and the other with a nichrome heater element at it's focus. Each reflector has two adjusters on it, one adjust for height and the other for tilt angle. Both adjusters will be important when it come to aligning the foci of both reflectors.
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||Two Parabolic reflectors||[:ThermoCabinetBayB3: TD, B3, Shelf #1]||4B40.10 ||
||Heater||ME, Bay B1, Shelf #2|| 4B40.10 ||
||Match||ME, Bay B1, Shelf #2|| ||		 ||Two Parabolic reflectors||[:ThermoCabinetBayB3: TD, B3, Shelf #1]||<:>4B40.10 ||
||Heater||[:ThermoCabinetBayB3: TD, B3, Shelf #1]|| ||
||Match|| || ||
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 1. Make a Setup check list.
 1. ...		 Alignment of the two parabolic reflectors: Alignment can be tricky and time consuming the further apart you place the two reflectors. 3 meters seems to be the maximum separation with this system.
 1. Place the parabolic reflector with the heater at one end of the table.
 1. Move the heater in and out of the focus to find the foci. The best way to do this is to put your face in the line of sight of the reflector. When the whole reflector has a red-orange glow and you can feel the heat on your face, you're good to go. The heater is close to the focus point of the reflector. Make sure that the whole reflector has this red-orange glow to it all the way the the receiving reflector. One may have to adjust the reflector’s tilt angle or height to maximize the reflectivity of the heat.
 1. Across the table move the receiving reflector in the line of sight of the transmitted radiation. Again one may have to adjust the reflector’s tilt angle or height to maximize the heat being received.
 1. To find the focus of the match tip to go into. One can use a peace of paper or there finger tip to feel and see the re-focused heat spot. Caution! When using your finger to find the best location for the match, this hot spot is “HOT” and can be painful and burn.
 1. Once the spot has been found, wiggle the match tip into place. One may have to adjust the match’s height and/or distances from the reflector to reach the maximize amount reflectivity of the heat to ignite the match.
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 1. List any Warnings....
 1. Demonstration may require practice.
  1. Try to align really carefully because if they are not aligned appropriately, the match will take time to light.
 1. Beware of the heater.
 1. When using your finger to find the best location for the match, this hot spot is “HOT” and can be painful and even burn.
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Insert description of demonstration, how is the demonstration preformed. This demonstration shows radiative heat transfer, heat energy or infrared radiation, which can be focused and then transmitted much the same way as light and sound waves can. After setup, you just need to plug the heater into an outlet and wait. The wait time depends on how close the reflectors are to each other. The further apart the reflectors are the longer the time will be. The match will light due to the radiative heat being transmitted from one focus to the other focuses and the infrared heat builds up to the ignition point of the match.
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||attachment other photos||attachment other photos||
||attachment other photos||attachment other photos||		 ||attachment:TD4B40_10-01i.jpg||attachment:TD4B40_10-02i.jpg||attachment:TD4B40_10-05i.jpg||
|| ||attachment:TD4B40_10-03i.jpg||attachment:TD4B40_10-04i.jpg||
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[Insert a back link to main topic list] [:FirstLaw:Heat and the First Law]

Light the Match , 4B40.10

Location:

  • Cabinet: Thermodynamics Cabinet

  • Bay: (B3)

  • Shelf: #1

attachment:TD4B40_10-01a.jpg

Description:

Radiative Heat Transfer, locally known as Light the Match.

Two large parabolic reflectors, 12 inches in diameter, one with a "white tipped" stick match at it's focus and the other with a nichrome heater element at it's focus. Each reflector has two adjusters on it, one adjust for height and the other for tilt angle. Both adjusters will be important when it come to aligning the foci of both reflectors.

Equipment

Location

ID Number

Two Parabolic reflectors

[:ThermoCabinetBayB3: TD, B3, Shelf #1]

4B40.10

Heater

[:ThermoCabinetBayB3: TD, B3, Shelf #1]

Match

Setup:

Alignment of the two parabolic reflectors: Alignment can be tricky and time consuming the further apart you place the two reflectors. 3 meters seems to be the maximum separation with this system.

  1. Place the parabolic reflector with the heater at one end of the table.
  2. Move the heater in and out of the focus to find the foci. The best way to do this is to put your face in the line of sight of the reflector. When the whole reflector has a red-orange glow and you can feel the heat on your face, you're good to go. The heater is close to the focus point of the reflector. Make sure that the whole reflector has this red-orange glow to it all the way the the receiving reflector. One may have to adjust the reflector’s tilt angle or height to maximize the reflectivity of the heat.
  3. Across the table move the receiving reflector in the line of sight of the transmitted radiation. Again one may have to adjust the reflector’s tilt angle or height to maximize the heat being received.
  4. To find the focus of the match tip to go into. One can use a peace of paper or there finger tip to feel and see the re-focused heat spot. Caution! When using your finger to find the best location for the match, this hot spot is “HOT” and can be painful and burn.
  5. Once the spot has been found, wiggle the match tip into place. One may have to adjust the match’s height and/or distances from the reflector to reach the maximize amount reflectivity of the heat to ignite the match.

Cautions, Warnings, or Safety Concerns:

  1. Try to align really carefully because if they are not aligned appropriately, the match will take time to light.
  2. Beware of the heater.
  3. When using your finger to find the best location for the match, this hot spot is “HOT” and can be painful and even burn.

Demonstration:

This demonstration shows radiative heat transfer, heat energy or infrared radiation, which can be focused and then transmitted much the same way as light and sound waves can. After setup, you just need to plug the heater into an outlet and wait. The wait time depends on how close the reflectors are to each other. The further apart the reflectors are the longer the time will be. The match will light due to the radiative heat being transmitted from one focus to the other focuses and the infrared heat builds up to the ignition point of the match.

attachment:TD4B40_10-01i.jpg

attachment:TD4B40_10-02i.jpg

attachment:TD4B40_10-05i.jpg

attachment:TD4B40_10-03i.jpg

attachment:TD4B40_10-04i.jpg

References:

  1. List any references

[:FirstLaw:Heat and the First Law]

[:Demonstrations:Demonstrations]

[:Instructional:Home]

fw: LightMatch (last edited 2018-07-18 19:13:18 by srnarf)