Heat transfer by thermal radiation
All bodies radiate energy in the form of photons moving in a random direction, with random phase and frequency. When radiated photons reach another surface, they may either be absorbed, reflected or transmitted.
http://web.mit.edu/16.unified/www/FALL/thermodynamics/notes/node133.html
Every system emits heat energy; in fact a system works on itself continuously that is positive work on the environment. Let's name it the "Inherent power of system". So, every system has an inherent power that is greater than zero P>0.
We give heat to a system, in fact k photons with speed c enter the system, and particles of system absorb them. In a real environment the inherent power of a system cannot be zero, even in space, because there is cosmic background radiation in space.
https://www.researchgate.net/publication/279531060_Graviton_physical_time_and_thermodynamics?ev=prf_pub
Article Graviton: physical time and thermodynamics
Hi Hossein,
In my opinion many type (in class and dimension) of particles can take, displace and cede heat among materials.
Photons can represent a source of heat for the materials that receive them.
But many other bigger particles can be heat.
Then the speed of transmission of heat is very different, depending of the particles, states and difference of temperature of the materials or elements that exchange this heat, etc.
This case, I would say that the speed of transmission of heat could be from a little to 300.000 km/s
I suppose it may be a function of
Density
Heat
Molecular structure of the elements
..
Hi Hossein,
In my opinion many type (in class and dimension) of particles can take, displace and cede heat among materials.
Photons can represent a source of heat for the materials that receive them.
But many other bigger particles can be heat.
Then the speed of transmission of heat is very different, depending of the particles, states and difference of temperature of the materials or elements that exchange this heat, etc.
This case, I would say that the speed of transmission of heat could be from a little to 300.000 km/s
Dears Roger and Fernando
I generally I agree with you. Bbut the question is, regardless of how the heat energy is transferred, what is the speed of heat energy when it is leaving the element of a system?
In the other word, is it possible to describe the relationship between temperature and molecular movement in a system by the conservation law of momentum?
Hossein,
I think these parameters (molecular movement, temperature, heat and speed of transmission of heat) don’t follow a strict and general interrelation among elements because each element or type of molecules should have different behavior regarding to heat.
On the other hand, I think heat represents a modality of potential energy, but not a direct inertial energy to be measured directly with relation to momentums.
Off course, I can be wrong surely.
Dear Fernando
According to thermodynamics laws, you are right. In my view, heat energy is same as matter with high speed. In the other word, energy moves with speed of light c, and matter moves with speed of v, that v
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