Chapt06

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Unformatted text preview: for low-speed flows, and the special optical techniques used in high-speed flows are treated in Ref. 21 of Chap. 1. Flow-measurement schemes suitable for open-channel and other free-surface flows are treated in Chap. 10. Local-Velocity Measurements Velocity averaged over a small region, or point, can be measured by several different physical principles, listed in order of increasing complexity and sophistication: | v v 6.10 Fluid Meters | e-Text Main Menu | Textbook Table of Contents | Study Guide 386 Chapter 6 Viscous Flow in Ducts Mt = 0.2 Bt = 0.09 Red = 120,000 Conical 25 2 θ = 18° 16° 14° 12° 10° 8° 16 6° 12 10 5° 4° 8 0.70 AR 6 3° 0.68 5 4 0.44 0.66 0.46 3 0.64 0.54 0.48 0.50 0.52 2.5 Cp 2° 0.62 0.60 0.58 0.56 2 1.75 Fig. 6.28b Typical performance maps for flat-wall and conical diffusers at similar operating conditions: (b) conical wall. (From Ref. 14, by permission of Creare, Inc.) 1.5 2 4 6 8 10 12 16 Diffuser length–throat diameter ratio L d (b) 20 25 30 1. Trajectory of floats or neutrally buoyant particles 2...
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