Page 164 - Mechanical Engineer's Data Handbook
P. 164
FLUID MECHANICS 153
Values of C,
orifice type Cd I!+ Arrangement
Rounded entry Nearly 1.0
Sharp edged 0.61-0.64
Borda reentrant About 0.72
(running full) 0 4
External mouthpiece About 0.86 0
c-, I
0 = - L O
4.3.2 Weirs, vee notch and channels
Unsuppressed weir
Flow Q =2.95C,(b-0.2H)H1.’
Suppressed weir
e
flow Q=2.36C,tan-H2.’
Flow Q=3.33bH1.’ 2
Vee notch where C,=discharge coefficient
