Energy Transfer Flashcards
What is Heat Transfer?
Temperature driven transient energy transfer along the boundaries of a system
What is Mass Flow?
For open systems the mass entering has energy and will increase the energy in the system
Total energy in system, E=
e=
U+1/2mv^2+mgh
u+1/2v^2+gh
Volume Flow Rate=
Average Flow velocity*X-sectional Area
Mass Flow Rate=
Density*Volume Flow Rate
Energy Flow Rate=
Mass Flow Rate*Total energy/unit mass
q=
Heat Transfer/Mass
Q=
Rate of Heat Transfer*Change in Time
What is Conduction?
The transfer of energy from the more energetic particles of a substance to the adjacent less energetic ones as a result of interactions between particles
Rate of Heat Transfer (Conduction)=
constantArea(Change in time/Thickness of conductor)
What is Convection?
The transfer of energy between a solid surface and the adjacent fluid that is in motion, and it involves the combined effects of conduction and fluid motion
Rate of Heat Transfer (Convection)=
hA(Ts-Tf)
What is Radiation?
The transfer of energy due to the emission of EM waves
Rate of Heat Transfer (Radiation)=
episilonsigmaA(Ts^4-Tsur^4)
What is a path function?
A function whose magnitude depend on the path followed during a process as well as the end state
Have inexact differentials
