CHARACTERISTICS CURVES OF TRIANGULAR NOTCH - Computer Programming

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## Wednesday, March 30, 2011

CHARACTERISTICS CURVES OF TRIANGULAR NOTCH

AIM:

To determine the co-efficient of discharge of flow through triangular notch.

APPARATUS REQUIRED:

1.      Notch tank
2.      Triangular notch
3.      Hook gauge
4.      Collecting tank
5.      Stop watch
6.      Piezo meter
7.      Meter scale

FORMULAE:

1. ACTUAL DISCHARGE:

Qact = A x h / t               (m³ / sec)

Where,
A = Area of the collecting tank                       (m²)
h  =  Rise of water level in collecting tank       (cm)
t = Time taken for ‘h’ rise of oil in collecting tank (s)

2. THEORETICAL DISCHARGE:

Qthe   =  (8 / 15) x (tan θ / 2) √ 2 x g x H 5/2        (m 3 / s)

Where
H = Manometer height in m
g  = Gravity in   m / s

3. CO-EFFICIENT OF DISCHARGE:

Cd = Qact  / Q the                                (no unit)

DESCRIPTION:

1.      The inlet valve is opened and water is allowed to rise up to the level of the triangular notch
2.      The pointer of the manometer gauge is adjusted so that it coincides the water surface and note down reading
3.      The inlet valve is opened so that the water flows over the notch at the same rate
4.      The water level is noted by means of point gauge
5.      The readings for H2 is noted
6.      The time required for10 cm rise of water level is noted
7.      The above procedure is repeated for different discharge

RESULT:
The co-efficient of discharge of triangular notch is Cd = ……(no unit)

Co efficient of discharge Cd  (no unit)

Theoretical discharge
Qthe x10-3
m3 \ sec

Mean =

Actual discharge Qact x10-3
m3\sec

Time taken for 10 cm of rise of water t sec

H= H1~ H2 cm

H2
cm

H1
cm