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The flow of heat is a form of energy transfer. Heat transfer is the natural process of moving energy to or from a system, other than by work or the transfer of matter. In a diathermal system, the internal energy can only be changed by the transfer of energy as heat: =.
Heat transfer is a discipline of thermal engineering that concerns the generation, use, conversion, and exchange of thermal energy between physical systems. Heat transfer is classified into various mechanisms, such as thermal conduction, thermal convection, thermal radiation, and transfer of energy by phase changes.
Thermal equilibrium - When two objects A and B are in thermal contact and there is no net transfer of thermal energy from A to B or from B to A, they are said to be in thermal equilibrium. The majority of objects experiencing thermal equilibrium still do exchange thermal energy but do so equally so that the net heat transfer is zero.
The macroscopic energy equation for infinitesimal volume used in heat transfer analysis is [6] = +, Ë™, where q is heat flux vector, −ρc p (∂T/∂t) is temporal change of internal energy (ρ is density, c p is specific heat capacity at constant pressure, T is temperature and t is time), and Ë™ is the energy conversion to and from thermal ...
Print/export Download as PDF; Printable version; ... Pages in category "Heat transfer" The following 153 pages are in this category, out of 153 total.
It is a measure of the rate of heat transfer inside a material and has SI units of m 2 /s. It is an intensive property . Thermal diffusivity is usually denoted by lowercase alpha ( α ), but a , h , κ ( kappa ), [ 2 ] K , [ 3 ] , D , D T {\displaystyle D_{T}} are also used.
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