[Stoves] Shields E450c as a way to test char-making stoves (attn: GACC testers)

Richard Stanley rstanley at legacyfound.org
Sat Oct 19 12:52:56 MDT 2013


Hi Tom, 
Thanks much for that but what about the bluish color at base of the flame, both immediately above and beneath stick  ?

Richard Stanley

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On Oct 19, 2013, at 7:02 AM, Thomas Reed wrote:

Dear Stephen, Dean and All

I recently warned that "temperature" is only really defined when solids and gases are in thermal equilibrium.  

During flaming pyrolysis of wood they are not in equilibrium.  The gases could be over 1000C while the surface of the solid, cooled by the reaction, is below 500C.  However, the subjective color is a good indication of approximate temperature as indicated in the following table from Wikipedia.  

"Subjective color to the eye of a black body thermal radiator[edit]

°C (°F)	Subjective color[5]
480 °C (896 °F)	faint red glow
580 °C (1,076 °F)	dark red
730 °C (1,350 °F)	bright red, slightly orange
930 °C (1,710 °F)	bright orange
1,100 °C (2,010 °F)	pale yellowish orange
1,300 °C (2,370 °F)	yellowish white
During flaming pyrolysis, the flames appear to me to be a bright orange, (due to incandescence of small particles) and so are 930 or higher.  At the same time, the pyrolysing material appears black, and so could be less than 480C.  Here's a picture of a burning match to ponder...


Thomas B Reed 
280 Hardwick Rd
Barre, Ma 01005
508-353-7841

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