To find the coefficient of discharge for a small orifice.

Object: To find the coefficient of discharge for a small orifice.

Apparatus Required:

• Hydraulic Bench with orifice (and notch) apparatus, measuring cylinder, stopwatch, and Vernier calipers.
  

Flow under constant head

Theory:

Flow under constant head:

• Q = Cd A
  

2 g H

• where Q = Discharge m³ / sec
  
• A = Orifice x – sec are a m²
  
• g = Acceleration due to gravity 9.81 m/sec²
  
• H = Head over orifice centre m
  
• 
   Cd = Q/ (A ) (4.1)
  

2 g H

Procedure:

Observations:

Area of tank, At .. x .. = .. cm²

Area of orifice, A

 ( )² = .. cm²

4

1. Flow under Constant Head
   

Results & Comments: