To examine quantitative characteristics of hydraulic jump formation on a horizontal floor of a rectangular channel.

Lab No. 12

Object: To examine quantitative characteristics of hydraulic jump formation on a horizontal floor of a rectangular channel.

Apparatus Required:

• Perspex–sided S4 tilting flume, with slope control device; stopwatch.
  

Perspex-sided S4 tilting flume

Theory:

The rise in water level, which occurs during the transformation of shooting flow to tranquil flow, is called hydraulic jump or standing wave. Where hydraulic jump takes place, a substantial part of the energy of the flowing liquid is dissipated.

The initial depth y and the sequent depth y of the jump are interconnected as under:-



y2  1

y1 2

1  8F ²

 1

(5.1)

where F1 is initial Fronde number, defined as

1

F1  ¹

gy1

v

(5.2)

The specific energy loss (ΔE E1-E2) is connected with y1 and y2 as under:-

( y  y )³

ΔE =

2 1

4 y1 y2

(5.3)

Procedure:

Graphs:

1. 
   Plot
   

y2

y1

against 1

1. 
   Plot ΔE against (y2 – y1)³ / y1 y2
   

1  8F²

1

Results & Comments: