Chapt06

Although detailed charts such as fig 637 are

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Unformatted text preview: use there is no diffuser provided for gradual expansion. The ISO recommended correlation for long-radius-nozzle discharge coefficient is Cd 0.9965 0.00653 1/2 106 ReD 1/2 0.9965 0.00653 106 Red 1/2 (6.134) | v v The second form is independent of the ratio and is plotted in Fig. 6.41. A similar ISO correlation is recommended for the short-radius ISA 1932 flow nozzle | e-Text Main Menu | Textbook Table of Contents | Study Guide 6.10 Fluid Meters 401 1.00 0.99 0.98 Cd Classical Herschel venturi (ReD) 0.97 0.96 All values of β 0.95 Long-radius nozzle (Red ) 0.94 Fig. 6.41 Discharge coefficient for long-radius nozzle and classical Herschel-type venturi. 0.93 104 105 106 107 108 Red , ReD Cd 0.9900 0.2262 4.1 (0.000215 Flow nozzles may have 0.001125 0.00249 4.7 ) 106 ReD 1.15 (6.135) values between 0.2 and 0.8. Venturi meter. The third and final type of obstruction meter is the venturi, named in honor of Giovanni Venturi (1746–1822), an Italian physicist who first tested conical expansions...
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