Heat Transfer Flashcards
Is a form of energy in transition and temperature difference is the driving for its propagation
Heat
Movement of heat from one body to another body by means of conduction, convection and radiation
Heat transfer
transfer of energy from more energetic particles of a substance to the adjacent less energetic ones
Conduction
It is due to collision and diffusion of molecules during random motion, in liquid and gases
Conduction
In solids, it is due to the combination of vibration of the molecules
Conduction
The rate of conduction through the plane layer is ________ to the temperature difference across the layer and the heat transfer
proportional
ability of the material to conduct heat
Thermal conductivity (k)
the slope of temperature curve on a T-x diagram
Temperature gradient
the measurement of a material capacity to resist heat flow from one side to the other
R-value
represent how fast heat diffuses through the material
Thermal diffusivity, m^2/s
thermal conductivity does not vary from one point to point within medium
Homogeneous medium
thermal conductivity (k) is the same in all directions
Isotropic medium
Thermal conductivity has variation
Heterogeneous medium
Thermal conductivity exists direct variation
Anisotropic medium
thermal conductivity in series then ___ is constant
Q or heat transfer
