**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:**

Q

_{the = }(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 = Q

_{act }/ 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 dischargeQ_{the }x10^{-3} m^{3 }\ sec | | | | | | Mean = | |

Actual discharge Q_{act }x10^{-3}m^{3}\sec | | | | | | ||

Time taken for 10 cm of rise of water t sec | | | | | | ||

Manometric reading | H= H1~ H2 cm | | | | | | |

H2cm | | | | | | ||

H1cm | | | | | | ||

| | | | | |

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