The thermal energy in transit due to a spatial temperature difference.
What is conduction?
When a temperature gradient exists in a stationary medium, which may be a solid or a fluid, we use the term to refer to the heat transfer that will occur across the medium.
When mustheat transfer occur?
Whenever a temperature differnceexists in a medium or between media.
What is convection?
Heat transfer that will occur between a surface and a moving fluidwhen they are at different temperatures.
What is radiation?
Energy emitted by matter that is at a nonzero temperature.
What are rate equationsused for?
To compute the amount of energy being transferred per unit time.
What is Fourier's law (one dimensional)?
What is q" a symbol for?
Heat flux. The units are (W/m2)
What is k a symbol for?
Thermal conductivity. Units are (W/m *K)
What mode uses Fourier's law?
Conduction.
What is Newton's Law of Cooling?
What does the parameter h symbolize?
Convection heat transfer coefficient.The units are (W/m2*K)
What mode uses Newton's Law of Cooling?
Convection.
What is the Stephen-Boltzmann law?
where Ts is the absolute temperature (K) of the surface and sigma is the Stefan-Boltzmann constant 5.67*10^-8 (W/m2*K4)
What does E symbolize?
The surface emissive power: the rate at which energy is released per unit area (W/m2).
What is the equation for heat fluxemitted by a real surface?
What does symbolize?
Emissivity : a radiative property of the surface.
What is the definition of irradiation G?
The rate at which all radiation is incident on a unit area of the surface.
What is the rate at which radiant energy is absorbed per unit surface area?