Calculating…
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How do we calculate?
Wave speed a = √(K/ρ ÷ (1 + K·D/(E·e))). If the closing time is shorter than the critical time (2L/a), Joukowsky applies: Δp = ρ × a × Δv; if longer, the Michaud approximation: Δp = 2 × ρ × L × v ÷ t. K is the bulk modulus of water (2.2 GPa), E the modulus of elasticity of the pipe material.
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