Question

Which formula is used to calculate head loss in valves?

(a) K^2 (v/2 g)

(b) K (v/2 g)

(c) K (v^2/2 g)

(d) K^3 (v^2/2 g)

The question was posed to me in an interview for job.

The origin of the question is Pipes, Valves and Fittings topic in chapter Building Blocks of Dairy Processing of Dairy Engineering

Answer 1

The correct answer is (c) K (v^2/2 g)

To explain: K (v^2/2 g) calculates head loss for Newtonian fluid. When fluid flows inside a pipeline, friction occurs between the moving fluid and the stationary pipe wall. The friction converts some of the fluid’s hydraulic energy into thermal energy. The thermal energy cannot be converted back to hydraulic energy, so the fluid experiences a drop in pressure. This conversion and loss of energy is known as head loss.