CHE215 - Lecture 2
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9 Terms
Forces that act on a particle at steady flow are:
Pressure force
Forces associated with the kinetic energy of the particle
Forces associated with the potential energy of the particle
Work-Energy Theorem
The work done on a particle by all forces acting on it is equal to the change of the kinetic energy of the particle.
Pressure head
The height of a column of the fluid that is needed to produce the pressure.
Velocity head
Represents the vertical distances needed for the fluid to fall freely (no friction) if it is to reach the velocity u from rest.
Elevation head
Related to the potential energy of the particle.
Stagnation and dynamic pressures
Arise from the conversion of kinetic energy in a flowing fluid into a “pressure rise” as the fluid is brought to rest.
Static pressure
The actual thermodynamic pressure of the fluid as it flows.
Hydrostatic pressure
Represent the change in pressure due to potential energy variations of the fluid as a result of elevation changes.
Increasing velocity, decreasing pressure
Relationship between velocity and pressure
