Heat Transfer Ch. 1
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What is heat transfer?
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 must heat transfer occur?
Whenever a temperature differnce exists in a medium or between media.

What is convection?
Heat transfer that will occur between a surface and a moving fluid when they are at different temperatures.

What is radiation?
Energy emitted by matter that is at a nonzero temperature.

What are rate equations used 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/m^{2})

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/m^{2}*K)

What mode uses Newton's Law of Cooling?
Convection.

What is the StephenBoltzmann law?
where T
_{s} is the
absolute temperature (K) of the surface and sigma is the
StefanBoltzmann constant 5.67*10^8 (W/m
^{2}*K
^{4})

What does E symbolize?
The surface emissive power: the rate at which energy is released per unit area (W/m^{2}).

What is the equation for heat flux emitted 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?

What is the
equation for
?

What does
symbolize?
Absorptivity.