Experiment Number 1[Ibrar Shah]

[5 th Semester ]E11CE-46

[Venturi Meter]

Procedure:

(1) Attached the manometer to the taps across venture meter.(2) Height of Mercury in two tubes should be at the same level.(3) Switched on the pump and controlled the volume

gradually. (4) Noted the difference of height of Mercury in two links

collected the water in the bucket for the specific time and at the end we weighed it.

Theory:Venturi Meter is a device which is also a variable head meter. And is used to calculate the flow rate for closed and semi-Closed system it is used.

Observations and CalculationsDensity of water (ρm) = 1 g/cm3

Density of Mercury (ρHg) = 13.54 gm/cm3

Viscosity of Water (μw) = 10.292 gm/ cm3

Diameter of Pipe (d1) = 4.08 cm

Diameter of Throat of venture meter (d2) = 2.54 cm

Venturi distance between the taps (∆z) = 11.3 cm

Cross sectional area of Pipe (A1) = π4 (4.08)2

= 13.079 cm2

Cross sectional area of Throat (A2) = π4 (2.54)2

= 5.067075 cm2

(1) Ahw = ( ρHg−ρwρw )∆hHg

= 9.554 cm

(2) CD = Gρw √A12−A2

2

A1 A2

= 1√2 g ¿¿¿

G= 300 g/sec and CD = 0.299949

(3) H1 = G/ρA1 = 22.94

H2 = G/ρA2 = 59.205

(4) NRe1 = d1μ1 ρμm = 9.0964

NRe2 = d1μ1 ρμm

= 14.9116

(5) ∆ P = ρw g ∆hw / gc

= 9.5554

(6) Q =UA =300 g/sec

(7) G’=G/A2 = 59.205

Tabular Form of Calculations

Serial #

G(g/s)

∆h(Hg)

∆h(w)

u1(m/s)

u2(m/s)

NRe1 NRe2 CD ∆P G’ Q

1 300 0.762

9.55 22.94

9.69 14.3 14.6 6.27

9.55 132.3 300

2 750 2.5 31.35

57.36

22.74

36.5 36.5 0.47

31.35 148.01

750

3 950 3.175

39.81

72.66

28.80

46.72

46.27

0.55

39.814

187.48

950

4 1000

3.302

41.40

76.48

30.32

48.76

48.76

0.57

41.40 197.35

1000