Different Types of Energies or Head of a Liquid in Motion

Different Types of Energies or Head of a Liquid in Motion. The following are the three types of energies or head of flowing liquids:

• 1. Potential energy or potential head. It is due to the position above some suitable datum line. It is denoted by z.
• 2. Kinetic energy or kinetic (or velocity) head. It is due to the velocity of flowing liquid. Its value is given by v2/ 2g, where v is the velocity of flow and g is the acceleration due to gravity.
• 3. Pressure energy or pressure head. It is due to the pressure of liquid. Its value is given by p/w, where p is the pressure in N / m2 and w is the weight density of the liquid in N / m3.

Note: The total energy or total head of a liquid particle in motion is given as follows :

Total energy, E = Potential energy + Kinetic energy + Pressure energy

and

• Total head, H = Potential head + Kinetic head + Pressure head