| Topic: |
Science > Physics |
| User: |
"Anton81" |
| Date: |
18 Apr 2006 08:20:16 AM |
| Object: |
Useful definition of heat diffusion "velocity"? |
Hi,
is there a sensible way to define a velocity of heat diffusion so that one
can estimate how long it takes to heat up things over some transfer medium?
Anton
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| User: "Old Man" |
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| Title: Re: Useful definition of heat diffusion "velocity"? |
18 Apr 2006 10:00:45 PM |
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"Anton81" <forum@anton.e4ward.com> wrote in message
news:e22p2g$1saa$1@gwdu112.gwdg.de...
Hi,
is there a sensible way to define a velocity of heat diffusion so that one
can estimate how long it takes to heat up things over some transfer
medium?
Yes: (C)onducrivity of heat. dE / dt = Area * C * ( dT / dx )
[Old Man
Anton
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| User: "Old Man" |
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| Title: Addendum: Re: Useful definition of heat diffusion "velocity"? |
18 Apr 2006 10:48:14 PM |
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"Old Man" <nomail@nomail.net> wrote in message
news:u7CdnV8PNKd8OtjZ4p2dnA@prairiewave.com...
"Anton81" <forum@anton.e4ward.com> wrote in message
news:e22p2g$1saa$1@gwdu112.gwdg.de...
Hi,
is there a sensible way to define a velocity of heat diffusion so that
one
can estimate how long it takes to heat up things over some transfer
medium?
Yes: (C)onducrivity of heat. dE / dt = Area * C * ( dT / dx )
Get velocity, v, from:
dE / dt = [ dE / dx ] [ dx / dt ] = v [ dE / dx ]
[Old Man]
[Old Man
Anton
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| User: "" |
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| Title: Re: Useful definition of heat diffusion "velocity"? |
18 Apr 2006 10:10:53 AM |
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Anton81 wrote:
is there a sensible way to define a velocity of heat diffusion so that one
can estimate how long it takes to heat up things over some transfer medium?
You do it through a diffusion constant.
http://en.wikipedia.org/wiki/Fick%27s_law
Enjoy.
Socks
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