Page 163 - Mechanical Engineer's Data Handbook

152 MECHANICAL ENGINEER'S DATA HANDBOOK

Cascaded bends
Plate : K= 0.2
K = 0.05 aerofoil vanes, 0.2 circular arc plate vanes Aerofoil : K - 0.05

4.3 Flow of liquids through various devices

Formulae are given for the flow through orifices, weirs Flow in channels depends on the cross-section, the
and channels. Orifices are used for the measurement of slope and the type of surface of the channel.
flow, weirs being for channel flow.

4.3. I Orifices
Let:
C, = coefficient of discharge
C, =coefficient of velocity
C, =coefficient of contraction
H =head
A = orifice area
Aj =jet area TIT