Civil Engineering MCQAE Level Civil Engineering
In Hardy Cross method for pipe network analysis, the correction to assumed flows delta_Q is:
Fluid MechanicsPipe Network Hardy CrossMEDIUM
Choose the correct answer
A
delta_Q = -Sum(hf) / Sum(n x hf / Q)
B
delta_Q = Sum(Q) / Sum(hf)
C
delta_Q = Sum(hf) / n
D
delta_Q = -n x Sum(hf)
Correct Answer
A. delta_Q = -Sum(hf) / Sum(n x hf / Q)
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Hardy Cross: delta_Q = -Sum(hf_loop) / Sum(n x |hf| / |Q|), where n = 2 for Darcy-Weisbach (hf = r Q^n). Iteration continues until delta_Q is negligible. Sum of flows at each junction must satisfy continuity.
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