The temperature of different parts in a flame

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SUMMARY

The discussion centers on temperature measurements taken from a methane-oxygen flame during a laboratory experiment. A temperature maximum was observed at 7-8mm above the blue part of the flame, which may be attributed to the optimal methane-oxygen mixture in the main reaction zone. The participants debated whether inaccuracies in the thermal elements used for measurement could account for the findings, but the consensus leans towards the significance of the reaction zone in explaining the temperature peak.

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We had a laboration where we did some temperature measurments on a flame and wrote a report on this. We got it back and were told to explain more deeply why we had a temperature maximum at a certain point.

What happened was this. We started to meassure on the point located preciecly above the blue part of the flame. Then we stepped out to the side with steps of 1mm. At 7-8mm we reached a temperature maximum. How can I expalin what happened there? One theory is that I can just blame the thermal-elements we used and say that we did an inaccurate meassurment. But I'm not really sure that would do the trick. Got some wounderings about perhaps it has something to do with that we have the best methan-oxygen mix there (we had an methan oxygen flame)

thanks for any help
 
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I found this picture and figured it might be that we reach the "main reaction zone" . Could that be a possible reason?

http://upload.wikimedia.org/wikipedia/en/c/c0/Flames.jpg
 
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