eng

1. Experiment 7
ORIFICE AND FREE JET FLOW
DETERMINATION OF COEFFICIENT OF DISCHARGE FROM
JET

2. OBJECTIVE:
• To determine Discharge coefficient of small orifice for constant head flow

3. APPARATUS:
 theF1-17 Orifice and free jet flow apparatus
 The F1-10 Hydraulic Bench
 Stop watch
 Graduated cylinder

4. theF1-17 Orifice and free jet flow apparatus

5. theF1-17 Orifice and free jet flow apparatus

6.  The F1-10 Hydraulic Bench

7.  Stop watch

8. https://www.youtube.com/watch?v=x3bVnho3NXc

9. https://www.youtube.com/watch?v=qAeEv38zm_M

10.  Graduated cylinder

11. THEORY:

15. Orifice
Diameter
d(m)
Head
h(m)
Volume
V(m3)
Time
t(sec)
Actual
flow rate
Qt(m3/S)
√𝒉
(m)0.5
1 0.003 0.36 72*10^-6
5
2 0.003 0.35 70*10^-6
3 0.003 0.34 68*10^-6
4 0.003 0.33 65*10^-6
5 0.003 0.32 63*10^-6
•Small Orifice: Diameter=3mm=0.003m

16. Orifice
Diameter
d(m)
Head
h(m)
Volume
V(m3)
Time
t(sec)
Actual
flow rate
Qt(m3/S)
√𝒉
(m)0.5
1 0.006 0.36 274*10^-6
5
2 0.006 0.35 272*10^-6
3 0.006 0.34 268*10^-6
4 0.006 0.33 266*10^-6
5 0.006 0.32 263*10^-6
•Large Orifice: Diameter=6mm=0.006m

17. Calculations and Data analysis:
 Plot flow rate Qt vs. ℎ and determine the slope of the graph.
 The coefficient of discharge Cd can then be calculated from

18. Discussion and Conclusion:
Compare the values of Cd with values reported in the
textbook for an Orifice Meter and discuss any difference (or
look for web resources).