[TheForge] Chip forge

[Mike Porter]

Speed of heat transfer in a chip forge: conduction vs. radiation vs. 
convection not relevant for all practical purposes. The surfaces are so 
close together that square of the distance is a non factor. Think of the 
media as a multiple source heat blanket completely surrounding a part.
Mike P.

----- Original Message ----- 
From: "Jerry Frost" <frosty at customcpu.com>
To: "Sponsored by ABANA" <theforge at mailman.qth.net>
Sent: Saturday, March 04, 2006 11:21 AM
Subject: Re: [TheForge] Chip forge


>I think you're probably solidly on base Steve.
>
> I don't know enough about these things to decide which of our logical 
> arguments is more valid. What you say makes perfect sense. Maybe my point 
> about the speed of heat transfer is either invalid or irrelevant. I don't 
> think it's too far off base though. I just don't know.
>
> Good thing there're more than one base in the ball park eh?
>
> Frosty
> -------------------------------
> If it ain't forged
> it ain't real.
> Wrought iron is.
> The FrostWorks
>
> Meadow Lakes, AK.
>
> http://www.artmetalradio.com/
>
> From: "Steve Smith" <sos at alum.mit.edu>
>
>
>>I could be completely off base here, but why does the surface area matter 
>>in radiative transfer? If the chips are all pretty much at the same 
>>temperature, isn't the steel already getting its max radiation, regardless 
>>of the chip surface area? Isn't the air (whatever) itself between chips 
>>radiating at the same temp as the chips? I think the steel is already 
>>getting the max IR since it is completely surrounded by a constant 
>>temperature environment.
>>
>> An isolated chip is going to radiate heat away faster if it has larger 
>> surface area, but that's not what we've got.
>>
>> Now I do think that chip shape is pretty important. Chip size and shape 
>> determines how well the flame flows through them and heats them. You 
>> might want lighter, smaller chips for small pieces of work, but lighter 
>> chips are probably more fragile too.
>>
>> I may have to build one of these forges, sounds pretty decent.
>>
>> Steve
>>
>
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