A flow net is a graphical representation of streamlines and equipotential lines such that these lines

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ESE Mechanical 2014 Official Paper - 1

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Explanation:

Flow net

Flow net is grid obtained by drawing a series of streamline ψ and equipotential lines ∅.
Flow net provides a simple graphical technique for studying 2D irrotational flows when the mathematical calculation is difficult and cumbersome.
The streamline ψ and equipotential lines ∅ are mutually perpendicular to each other.
The streamlines are so spaced so that rate of flow Q is the same between each successive pair of lines.
The streamlines in the flow net show the direction of flow and equipotential lines join the points at the equal velocity potential ∅.
For example, the Flow-through Francis water turbine rotor is analyzed by flow net.