Heat Transfer Ch. 1

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Heat Transfer Ch. 1
2012-09-26 03:17:45
heat transfer

Study questions for heat transfer chapter 1.
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  1. What is heat transfer?
    The thermal energy in transit due to a spatial temperature difference.
  2. 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.
  3. When must heat transfer occur?
    Whenever a temperature differnce exists in a medium or between media.
  4. What is convection?
    Heat transfer that will occur between a surface and a moving fluid when they are at different temperatures.
  5. What is radiation?
    Energy emitted by matter that is at a nonzero temperature.
  6. What are rate equations used for?
    To compute the amount of energy being transferred per unit time.
  7. What is Fourier's law (one dimensional)?
  8. What is q" a symbol for?
    Heat flux. The units are (W/m2)
  9. What is k a symbol for?
    Thermal conductivity. Units are (W/m *K)
  10. What mode uses Fourier's law?
  11. What is Newton's Law of Cooling?
  12. What does the parameter h symbolize?
    Convection heat transfer coefficient. The units are (W/m2*K)
  13. What mode uses Newton's Law of Cooling?
  14. 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)
  15. What does E symbolize?
    The surface emissive power: the rate at which energy is released per unit area (W/m2). 
  16. What is the equation for heat flux emitted by a real surface?
  17. What does  symbolize? 
    Emissivity : a radiative property of the surface. 
  18. What is the definition of irradiation G?
    The rate at which all radiation is incident on a unit area of the surface.
  19. What is the rate at which radiant energy is absorbed per unit surface area?
  20. What is the equation for ?
  21. What does  symbolize?