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Unformatted text preview: Extensive discussions of laser velocimetry are given in Refs. 38 and 39. EXAMPLE 6.20 The pitot-static tube of Fig. 6.30 uses mercury as a manometer fluid. When it is placed in a water flow, the manometer height reading is h 8.4 in. Neglecting yaw and other errors, what is the flow velocity V in ft/s? Solution From the two-fluid manometer relation (2.33), with zA h by p0 ps ( M z2, the pressure difference is related to w)h Taking the specific weights of mercury and water from Table 2.1, we have 8.4 p0 ps (846 62.4 lbf/ft3) ft 549 lbf/ft2 12 The density of water is 62.4/32.2 1.94 slugs/ft3. Introducing these values into the pitot-static formula (6.117), we obtain | v v 390 | e-Text Main Menu | Textbook Table of Contents | Study Guide 6.10 Fluid Meters 2(549 lbf/ft2) 1/2 23.8 ft/s 1.94 slugs/ft3 Since this is a low-speed flow, no compressibility correction is needed. V Volume-Flow Measurements 391 Ans. It is often desirable to measure the integrated mass, or volume flow, passing through a duct. Accurate measurement of flow is vital in billing customers for a given amount o...
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This note was uploaded on 10/27/2009 for the course MAE 101a taught by Professor Sakar during the Spring '08 term at UCSD.

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