The loss of head due to sudden enlargement in a pipe flow carrying velocity v1 in smaller pipe and v2 in larger pipe is given by:
A(v1 - v2)² / (2g)
B(v1² - v2²) / (2g)
C0.5 * v1² / (2g)
D(v1 + v2)² / (2g)
Explanation
Head loss due to sudden expansion is given by he = (v1 – v2)² / (2g), derived using impulse-momentum principle.

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