Question: Note in Figs. 10.10 and 10.11 that the minimum energy loss for a gradual contraction (K = 0.04 approximately) occurs when the cone angle is

Note in Figs. 10.10 and 10.11 that the minimum energy loss for a gradual contraction (K = 0.04 approximately) occurs when the cone angle is in the range of 15 to 40. Make scale drawings of contractions at both of these extremes for a reduction from a 6-in to a 3-in ductile iron pipe.

Figure 10.10

Figure 10.11

0.4+ e - 150° 0.3 120° 105° 0.2 90° 70° 0.1 50°-60° 15°-40° 1.0 2.0 3.0 Diameter ratio D,/D, Resista nce coeffi

D1 0.4+ e - 150 0.3 120 105 0.2 90 70 0.1 50-60 15-40 1.0 2.0 3.0 Diameter ratio D,/D, Resista nce coefficient K

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