Chapt06

10 fluid meters 401 100 099 098 097 096 095 094 long

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Unformatted text preview: ge Medium Small Small Medium Large | v v As so often happens, the product of inefficiency and initial cost is approximately constant. | e-Text Main Menu | Textbook Table of Contents | Study Guide 402 Chapter 6 Viscous Flow in Ducts 1.00 0.98 Cd 0.96 International standards: 0.316 < β < 0.775 1.5 × 10 5 < ReD < 2.0 × 106 0.94 0.92 0.3 Fig. 6.42 Discharge coefficient for a venturi nozzle. 0.4 0.5 0.6 0.7 0.8 β The average nonrecoverable head losses for the three types of meters, expressed as a fraction of the throat velocity head V 2/(2g), are shown in Fig. 6.43. The orifice has t the greatest loss and the venturi the least, as discussed. The orifice and nozzle simulate partially closed valves as in Fig. 6.18b, while the venturi is a very minor loss. When the loss is given as a fraction of the measured pressure drop, the orifice and nozzle have nearly equal losses, as Example 6.21 will illustrate. 3.0 2.5 Thin-plate orifice hm 1.5 Km = Vt2/(2g) 2.0 1.0 Flow nozzle Venturi: 0.5 | v v Fig. 6.43 Nonrecoverable head loss in Bernoulli obstruction meters. (Ada...
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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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