Liquid Flow

10 February 2009

Because liquids are incompressible fluids, their flow rate depends only on the difference between the inlet and outlet pressures (Δp, pressure drop). The flow is the same whether the system pressure is low or high, so long as the difference between the inlet and outlet pressures is the same. (Equation 1 shows the relationship.)

Equation 1

Equation 1

Key

Key

Water flow graph (1)

The water flow graphs show water flow as a function of pressure drop for a range of Cv values.

Water flow graph (2)

Water flow graph

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