Mechanical laboratory methods; the testing of instruments and machines in the mechanical engineering laboratory and in practice (1922)
Smallwood, Julian Chase · New York, D. Van Nostrand company · leaf 126
from which the cubic feet per second discharged under idealconditions is Q = area X velocity D2 . =0-7854d2vF^vW^o. Owing to friction losses the discharge thus calculated is too high.To allow for this, a coefficient of discharge, (7, less than unity,is introduced. Combining v 2g and 0.7854, for… … 0.95 and 0.99, and the value of R is usually 2 or 3 to 1. It is thusseen that an uncalibrated Venturi meter may be used with notmore than 2 per cent of error by assuming C = 0.97. The meter is generally shaped with an annular space A, Fig.62, from which to lead the opening transmitting pressure.…
Mechanical engineering
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