Useful Equations

079 re025 hf r for re 4000 2f v 2 l gd hf i k l 6 v2

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Unformatted text preview: = 0 ρg 2g (4.25) Bernoulli Equation: Mechanical energy balance equation ￿ hf r + ￿ hf i + ∆p ∆( v 2 ) ws + + ∆z = − ρg 2g g f = 0.079 Re−0.25 hf r = (for Re > 4000) 2f v 2 L gD hf i = K L × 6 ￿ v2 2g (4.29) (4.32) (4.35) ￿ (4.36) Table 1: Loss coefficients for common pipe fittings Fitting KL Parameter Comment Standard 90◦ elbow 0.75 Gate valve fully open 0.25 Entrance to pipes 1.0 Projecting entrance from tanks 0.5 Flush entrance 0.05 Rounded entrance Sudden enlargement (1 − A1 /A2 )2 A1 = area before enlargement. A2 = area after enlargement. v is taken as the velocity before enlargement Sudden contraction 0.5 A2 /A1 = 0 A2 = area of the 0.34 A2 /A1 = 0.2 smaller pipe. 0.27 A2 /A1 = 0.4 v is taken as t...
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This document was uploaded on 03/26/2014.

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