What are the different types of efficiencies in hydraulic pumps?

Explanation:

Pump: 

It is a mechanical device that is used for the transportation of a liquid from one location to another location by mechanical action, typically converted from electrical energy into hydraulic energy. 

Efficiency of hydraulic pumps: 

• A typical hydraulic pump is only 80-90% efficient.
• The energy is lost in two main forms:
  • ​Mechanical losses: energy lost to fluid friction
  • Volumetric losses: energy lost as the result of internal fluid leakage (slippage) within the pump.
• The ​different types of efficiencies in hydraulic pumps are:

1. Manometric efficiency: It is defined as ratio of the manometric head developed by the pump to the head imparted by impeller to the liquid.

​  \(\eta_{mano}=\frac{H_{m}}{\frac{V_{w_{2}}u_{2}}{g}} = \frac{gH_{m}}{V_{w_{2}}u_{2}}\)  , This efficiency accounts for hydraulic losses and leakage losses.

   \(\eta_{v}=\frac{Q}{Q+\delta Q}\) ​, This efficiency accounts for leakage losses.

  \(\eta_{m}=\frac{\frac{V_{w_{2}}u_{2}}{g}}{S_{p}} \) ,  This efficiency accounts for mechanical losses.