| Topic: |
Science > Physics |
| User: |
"lavanya" |
| Date: |
19 Jan 2005 02:54:13 PM |
| Object: |
hai , Iam a stranger to this group |
Hai , Iam a student doing masters in heat transfer. I would like to
know about Prevost's law.Can anyone explain clearly about prevost's law.
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| User: "tadchem" |
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| Title: Re: hai , Iam a stranger to this group |
19 Jan 2005 03:16:31 PM |
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Prevost's Law merely states that the amount of heat lost by a warm body
in thermal contact with a cooler one equals the amount of heat gained
by the cool body from thermal contact with the warmer one.
It is essentially a specialized statement of the Law of Conservation of
Energy, as applied to heat transfer.
It allows the calculation of the equilibrium temperature of the two
bodies knowing their temperatures, masses, and heat capacities:
M(1)*Cp(1)*T(1) + M(2)*Cp(2)*T2 = [M(1)*Cp(1) + M(2)*Cp(2)]*T(eq)
and is useful in calorimetry.
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| User: "Franz Heymann" |
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| Title: Re: hai , Iam a stranger to this group |
20 Jan 2005 04:23:15 AM |
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"tadchem" <thomas.davidson@dla.mil> wrote in message
news:1106169391.562074.113170@c13g2000cwb.googlegroups.com...
Prevost's Law merely states that the amount of heat lost by a warm
body
in thermal contact with a cooler one equals the amount of heat
gained
by the cool body from thermal contact with the warmer one.
The Prevost's Law with which I am familiar has to do with relating the
rate of loss of *radiant* heat compared with the rate of gain of
*radiant* heat when a body is in thermodynamic equilibrium with its
surroundings. As far as I know, it says nothing about heat exchanged
by conduction.
Franz
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| User: "Name" |
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| Title: Re: hai , Iam a stranger to this group |
20 Jan 2005 06:08:04 PM |
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"Franz Heymann" <notfranz.heymann@btopenworld.com> wrote in message
news:cso0qi$1fd$3@titan.btinternet.com...
"tadchem" <thomas.davidson@dla.mil> wrote in message
news:1106169391.562074.113170@c13g2000cwb.googlegroups.com...
Prevost's Law merely states that the amount of heat lost by a warm
body
in thermal contact with a cooler one equals the amount of heat
gained
by the cool body from thermal contact with the warmer one.
The Prevost's Law with which I am familiar has to do with relating the
rate of loss of *radiant* heat compared with the rate of gain of
*radiant* heat when a body is in thermodynamic equilibrium with its
surroundings. As far as I know, it says nothing about heat exchanged
by conduction.
Franz
Then it is to the 4th power of absolute temp difference.
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| User: "Franz Heymann" |
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| Title: Re: hai , Iam a stranger to this group |
21 Jan 2005 10:23:48 AM |
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"Name" <nospam@nospam.com> wrote in message
news:35avesF4k5l4uU1@individual.net...
"Franz Heymann" <notfranz.heymann@btopenworld.com> wrote in message
news:cso0qi$1fd$3@titan.btinternet.com...
"tadchem" <thomas.davidson@dla.mil> wrote in message
news:1106169391.562074.113170@c13g2000cwb.googlegroups.com...
Prevost's Law merely states that the amount of heat lost by a
warm
body
in thermal contact with a cooler one equals the amount of heat
gained
by the cool body from thermal contact with the warmer one.
The Prevost's Law with which I am familiar has to do with relating
the
rate of loss of *radiant* heat compared with the rate of gain of
*radiant* heat when a body is in thermodynamic equilibrium with
its
surroundings. As far as I know, it says nothing about heat
exchanged
by conduction.
Franz
Then it is to the 4th power of absolute temp difference.
You have one or two things incorrectly mixed up in your mind.
There is no law which relates radiated power to the difference in
temperature between two objects.
Franz
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| User: "tadchem" |
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| Title: Re: hai , Iam a stranger to this group |
25 Jan 2005 05:24:40 PM |
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"Franz Heymann" <notfranz.heymann@btopenworld.com> wrote in message
news:cso0qi$1fd$3@titan.btinternet.com...
"tadchem" <thomas.davidson@dla.mil> wrote in message
news:1106169391.562074.113170@c13g2000cwb.googlegroups.com...
Prevost's Law merely states that the amount of heat lost by a warm
body
in thermal contact with a cooler one equals the amount of heat
gained
by the cool body from thermal contact with the warmer one.
The Prevost's Law with which I am familiar has to do with relating the
rate of loss of *radiant* heat compared with the rate of gain of
*radiant* heat when a body is in thermodynamic equilibrium with its
surroundings. As far as I know, it says nothing about heat exchanged
by conduction.
You may be correct, sir.
I can no longer locate my original source on that, but I recall that
thermodynamic equilibrium between a body and its surroundings was involved;
I do *not* recall that the method of heat interchange was specified as the
context was calorimetry and that the equations reduced to conservation of
energy in a thermal sense.
Tom Davidson
Richmond, VA
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