week 8 Flashcards
1
Q
what is conduction
A
Heat transfer in gas or liquid due to the random motion of its constituent atoms, molecules and /or electrons
2
Q
what is convection
A
Heat transfer due to the combined influence of bulk and random motion
for fluid flow over a surface.
3
Q
what is radiation
A
Energy that is emitted by matter due to changes in the electron
configurations of its atoms or molecules and is transported as electromagnetic
waves (or photons).
4
Q
what is forced convection
A
motion of the fluid is produced by external
means (e.g. fans, pumps and atmospheric wind).
5
Q
what is the natural or free convection
A
In natural or free convection, the motion of the
fluid is the result of differences of density (i.e.
buoyancy) resulting from the temperature
difference
