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/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 T_s 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 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.

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Card Set

Heat Transfer Ch. 1

Description

Study questions for heat transfer chapter 1.

Updated

2012-09-26T07:17:45Z

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