Chapt06

10 fluid meters 399 ellipse 2d 3 d flow 06 d d d flow

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Unformatted text preview: cous Flow in Ducts 0.66 0.65 1 D 2 D 0.7 β = 0.8 = d D 0.64 p2 p1 0.63 D d Flow 0.6 Cd 0.62 0.5 0.61 0.4 0.3 0.60 0.2 0.59 Fig. 6.40 Discharge coefficient for a thin-plate orifice with D: 1 D taps, 2 plotted from Eqs. (6.132) and (6.133b). 0.58 10 4 105 10 6 107 ReD D: 1 D taps: 2 Flange taps: F1 1 D (in) F2 0.4333 F1 F2 0.47 1 D (in) 0.4333 (6.133b) D 2.0 2.3 in D 2.3 in (6.133c) Note that the flange taps (6.133c), not being geometrically similar, use raw diameter in inches in the formula. The constants will change if other diameter units are used. We cautioned against such dimensional formulas in Example 1.4 and Eq. (5.17) and give Eq. (6.133c) only because flange taps are widely used in the United States. Flow nozzle. The flow nozzle comes in two types, a long-radius type shown in Fig. 6.39a and a short-radius type (not shown) called the ISA 1932 nozzle [30, 31]. The flow nozzle, with its smooth rounded entrance convergence, practically eliminates the vena contracta and gives discharge coefficients near unity. The nonrecoverable loss is still large beca...
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