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It is intended to be operated in a narrow reynolds

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Unformatted text preview: pted from Ref. 30.) 0 15° cone angle 7° cone angle 0.2 0.3 0.4 0.5 0.6 0.7 0.8 β | e-Text Main Menu | Textbook Table of Contents | Study Guide 6.10 Fluid Meters 403 The other types of instruments discussed earlier in this section can also serve as flowmeters if properly constructed. For example, a hot wire mounted in a tube can be calibrated to read volume flow rather than point velocity. Such hot-wire meters are commercially available, as are other meters modified to use velocity instruments. For further details see Ref. 30. EXAMPLE 6.21 We want to meter the volume flow of water ( 1000 kg/m3, 1.02 10 6 m2/s) moving through a 200-mm-diameter pipe at an average velocity of 2.0 m/s. If the differential pressure gage selected reads accurately at p1 p2 50,000 Pa, what size meter should be selected for installing (a) an orifice with D: 1 D taps, (b) a long-radius flow nozzle, or (c) a venturi nozzle? 2 What would be the nonrecoverable head loss for each design? Solution Here the unknown is the ratio of the meter. Since the discharge coefficient is a complicated function of , iteration will be nece...
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