Module 7: Energy conservation
  Lecture 19: Mechanical energy balance
 
 
Energy Conservation Equation

Similar to the derivation of continuity and momentum conservation equations, one can also apply Reynolds Transport equation to obtain the energy-conservation equation. In this course, we will, however, not derive the expression and restrict our discussion to the salient features of the equation and its application to the fluid-flow.
For a flow-system,  (specific property) for energy consists of three terms :

where, N = total property  

Re-call,   for N= mass                                  

   for N = momentum
   for N= energy (J)
    KE      PE   IE
The three terms may be recognized as kinetic energy, potential energy, and internal energy, respectively.