# Heat Transfer Ch. 1

 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 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 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. Authorthursdaymofo ID173520 Card SetHeat Transfer Ch. 1 DescriptionStudy questions for heat transfer chapter 1. Updated2012-09-26T07:17:45Z Show Answers